Enum SelectionExpr 

pub enum SelectionExpr {
    Identity,
    Union(Box<SelectionExpr>, Box<SelectionExpr>),
    Intersection(Box<SelectionExpr>, Box<SelectionExpr>),
    Difference(Box<SelectionExpr>, Box<SelectionExpr>),
    SymmetricDifference(Box<SelectionExpr>, Box<SelectionExpr>),
    Complement(Box<SelectionExpr>),
    Unary(usize, Box<SelectionExpr>, Vec<BindGroup>),
    Binary(Box<SelectionExpr>, usize, Box<SelectionExpr>, Vec<BindGroup>),
    Selection(usize, Vec<BindGroup>),
    Buffer(SelectionBuffer),
}

A selection expression tree.

Overview

This can be used to carry out operations on selection buffers, these operations are evaluated by SelectionBundle::evaluate in a recursive manner (depth-first).

Custom Operations

SelectionExpr::Unary, SelectionExpr::Binary, and SelectionExpr::Selection are custom operations that can be defined with additional ComputeBundles, so they also carry a vector of bind groups that are used in the operation when dispatched/evaluated. These vectors should correspond to the selection bundle’s bind groups starting at index 1, because index 0 must be defined by SelectionBundle::GAUSSIANS_BIND_GROUP_LAYOUT_DESCRIPTOR.

Variants

Identity

Apply an identity operation.

Union(Box<SelectionExpr>, Box<SelectionExpr>)

Union of the two selections.

Intersection(Box<SelectionExpr>, Box<SelectionExpr>)

Interaction of the two selections.

Difference(Box<SelectionExpr>, Box<SelectionExpr>)

Difference of the two selections.

SymmetricDifference(Box<SelectionExpr>, Box<SelectionExpr>)

Symmetric difference of the two selections.

Complement(Box<SelectionExpr>)

Complement of the selection.

Unary(usize, Box<SelectionExpr>, Vec<BindGroup>)

Apply a custom unary operation.

Binary(Box<SelectionExpr>, usize, Box<SelectionExpr>, Vec<BindGroup>)

Apply a custom binary operation.

Selection(usize, Vec<BindGroup>)

Create a selection.

Buffer(SelectionBuffer)

Directly use a selection buffer.

Implementations

impl SelectionExpr

pub const CUSTOM_OP_START: u32 = 5

The first u32 value for a custom operation.

pub fn identity() -> Self

Create a new SelectionExpr::Identity.

pub fn union(self, other: Self) -> Self

Create a new SelectionExpr::Union.

Examples found in repository

examples/filter_selection.rs (lines 187-190)

async fn main() {
    env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("info")).init();

    let args = Args::parse();
    let model_path = &args.model;
    let pos = Vec3::from_slice(&args.pos);
    let rot = Quat::from_slice(&args.rot);
    let scale = Vec3::from_slice(&args.scale);
    let shape = match args.shape {
        Shape::Sphere => gs::SelectionBundle::<GaussianPod>::create_sphere_bundle,
        Shape::Box => gs::SelectionBundle::<GaussianPod>::create_box_bundle,
    };
    let repeat = args.repeat;
    let offset = Vec3::from_slice(&args.offset);

    log::debug!("Creating wgpu instance");
    let instance =
        wgpu::Instance::new(wgpu::InstanceDescriptor::new_without_display_handle_from_env());

    log::debug!("Requesting adapter");
    let adapter = instance
        .request_adapter(&wgpu::RequestAdapterOptions::default())
        .await
        .expect("adapter");

    log::debug!("Requesting device");
    let (device, queue) = adapter
        .request_device(&wgpu::DeviceDescriptor {
            label: Some("Device"),
            required_limits: adapter.limits(),
            ..Default::default()
        })
        .await
        .expect("device");

    log::debug!("Creating gaussians");
    let gaussians = [
        gs::core::GaussiansSource::Ply,
        gs::core::GaussiansSource::Spz,
    ]
    .into_iter()
    .find_map(|source| gs::core::Gaussians::read_from_file(model_path, source).ok())
    .expect("gaussians");

    log::debug!("Creating gaussians buffer");
    let gaussians_buffer = gs::core::GaussiansBuffer::<GaussianPod>::new(&device, &gaussians);

    log::debug!("Creating model transform buffer");
    let model_transform = gs::core::ModelTransformBuffer::new(&device);

    log::debug!("Creating Gaussian transform buffer");
    let gaussian_transform = gs::core::GaussianTransformBuffer::new(&device);

    log::debug!("Creating shape selection compute bundle");
    let shape_selection = shape(&device);

    log::debug!("Creating selection bundle");
    let selection_bundle = gs::SelectionBundle::<GaussianPod>::new(&device, vec![shape_selection]);

    log::debug!("Creating shape selection buffers");
    let shape_selection_buffers = (0..repeat)
        .map(|i| {
            let offset_pos = pos + offset * i as f32;
            let buffer = gs::InvTransformBuffer::new(&device);
            buffer.update_with_scale_rot_pos(&queue, scale, rot, offset_pos);
            buffer
        })
        .collect::<Vec<_>>();

    log::debug!("Creating shape selection bind groups");
    let shape_selection_bind_groups = shape_selection_buffers
        .iter()
        .map(|buffer| {
            selection_bundle.bundles[0]
                .create_bind_group(
                    &device,
                    // index 0 is the Gaussians buffer, so we use 1,
                    // see docs of create_sphere_bundle or create_box_bundle
                    1,
                    [buffer.buffer().as_entire_binding()],
                )
                .expect("bind group")
        })
        .collect::<Vec<_>>();

    log::debug!("Creating selection expression");
    let selection_expr = shape_selection_bind_groups.into_iter().fold(
        gs::SelectionExpr::Identity,
        |acc, bind_group| {
            acc.union(gs::SelectionExpr::selection(
                0, // the 0 here is the bundle index in the selection bundle
                vec![bind_group],
            ))
        },
    );

    log::debug!("Creating destination buffer");
    let dest = gs::SelectionBuffer::new(&device, gaussians_buffer.len() as u32);

    log::info!("Starting selection process");
    let time = std::time::Instant::now();

    log::debug!("Selecting Gaussians");
    let mut encoder = device.create_command_encoder(&wgpu::CommandEncoderDescriptor {
        label: Some("Selection Encoder"),
    });

    selection_bundle.evaluate(
        &device,
        &mut encoder,
        &selection_expr,
        &dest,
        &model_transform,
        &gaussian_transform,
        &gaussians_buffer,
    );

    queue.submit(Some(encoder.finish()));

    device
        .poll(wgpu::PollType::wait_indefinitely())
        .expect("poll");

    log::info!("Editing process completed in {:?}", time.elapsed());

    log::debug!("Filtering Gaussians");
    let selected_gaussians = dest
        .download::<u32>(&device, &queue)
        .await
        .expect("selected download")
        .iter()
        .flat_map(|group| {
            std::iter::repeat_n(group, 32)
                .enumerate()
                .map(|(i, g)| g & (1 << i) != 0)
        })
        .zip(gaussians.iter_gaussian())
        .filter(|(selected, _)| *selected)
        .map(|(_, g)| g)
        .collect::<Vec<_>>();

    let selected_gaussians = match &args.output[args.output.len().saturating_sub(4)..] {
        ".ply" => gs::core::Gaussians::Ply(gs::core::PlyGaussians::from_iter(
            selected_gaussians.into_iter(),
        )),
        ".spz" => {
            gs::core::Gaussians::Spz(
                gs::core::SpzGaussians::from_gaussians_with_options(
                    selected_gaussians,
                    &gs::core::SpzGaussiansFromGaussianSliceOptions {
                        version: 2, // Version 2 is more widely supported as of now
                        ..Default::default()
                    },
                )
                .expect("SpzGaussians from gaussians"),
            )
        }
        _ => panic!("Unsupported output file extension, expected .ply or .spz"),
    };

    log::debug!("Writing modified Gaussians to output file");
    selected_gaussians
        .write_to_file(&args.output)
        .expect("write modified Gaussians to output file");

    log::info!("Filtered Gaussians written to {}", args.output);
}

examples/modify_selection.rs (lines 242-245)

async fn main() {
    env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("info")).init();

    let args = Args::parse();
    let model_path = &args.model;
    let pos = Vec3::from_slice(&args.pos);
    let rot = Quat::from_slice(&args.rot);
    let scale = Vec3::from_slice(&args.scale);
    let shape = match args.shape {
        Shape::Sphere => gs::SelectionBundle::<GaussianPod>::create_sphere_bundle,
        Shape::Box => gs::SelectionBundle::<GaussianPod>::create_box_bundle,
    };
    let repeat = args.repeat;
    let offset = Vec3::from_slice(&args.offset);

    log::debug!("Creating wgpu instance");
    let instance =
        wgpu::Instance::new(wgpu::InstanceDescriptor::new_without_display_handle_from_env());

    log::debug!("Requesting adapter");
    let adapter = instance
        .request_adapter(&wgpu::RequestAdapterOptions::default())
        .await
        .expect("adapter");

    log::debug!("Requesting device");
    let (device, queue) = adapter
        .request_device(&wgpu::DeviceDescriptor {
            label: Some("Device"),
            required_limits: adapter.limits(),
            ..Default::default()
        })
        .await
        .expect("device");

    log::debug!("Creating gaussians");
    let gaussians = [
        gs::core::GaussiansSource::Ply,
        gs::core::GaussiansSource::Spz,
    ]
    .into_iter()
    .find_map(|source| gs::core::Gaussians::read_from_file(model_path, source).ok())
    .expect("gaussians");

    log::debug!("Creating editor");
    let editor = gs::Editor::<GaussianPod>::new(&device, &gaussians);

    log::debug!("Creating shape selection compute bundle");
    let shape_selection = shape(&device);

    log::debug!("Creating basic selection modifier");
    let mut basic_selection_modifier = gs::SelectionModifier::new_with_basic_modifier(
        &device,
        &editor.gaussians_buffer,
        &editor.model_transform_buffer,
        &editor.gaussian_transform_buffer,
        vec![shape_selection],
    );

    log::debug!("Configuring modifiers");
    basic_selection_modifier
        .modifier
        .basic_color_modifiers_buffer
        .update(
            &queue,
            match args.override_rgb {
                true => gs::BasicColorRgbOverrideOrHsvModifiersPod::new_rgb_override,
                false => gs::BasicColorRgbOverrideOrHsvModifiersPod::new_hsv_modifiers,
            }(Vec3::from_slice(&args.rgb_or_hsv)),
            args.alpha,
            args.contrast,
            args.exposure,
            args.gamma,
        );

    log::debug!("Creating shape selection buffers");
    let shape_selection_buffers = (0..repeat)
        .map(|i| {
            let offset_pos = pos + offset * i as f32;
            let buffer = gs::InvTransformBuffer::new(&device);
            buffer.update_with_scale_rot_pos(&queue, scale, rot, offset_pos);
            buffer
        })
        .collect::<Vec<_>>();

    log::debug!("Creating shape selection bind groups");
    let shape_selection_bind_groups = shape_selection_buffers
        .iter()
        .map(|buffer| {
            basic_selection_modifier.selection.bundles[0]
                .create_bind_group(
                    &device,
                    // index 0 is the Gaussians buffer, so we use 1,
                    // see docs of create_sphere_bundle or create_box_bundle
                    1,
                    [buffer.buffer().as_entire_binding()],
                )
                .expect("bind group")
        })
        .collect::<Vec<_>>();

    log::debug!("Creating selection expression");
    basic_selection_modifier.selection_expr = shape_selection_bind_groups.into_iter().fold(
        gs::SelectionExpr::Identity,
        |acc, bind_group| {
            acc.union(gs::SelectionExpr::selection(
                0, // the 0 here is the bundle index in the selection bundle
                vec![bind_group],
            ))
        },
    );

    log::info!("Starting editing process");
    let time = std::time::Instant::now();

    log::debug!("Editing Gaussians");
    let mut encoder = device.create_command_encoder(&wgpu::CommandEncoderDescriptor {
        label: Some("Edit Encoder"),
    });

    editor.apply(
        &device,
        &mut encoder,
        [&basic_selection_modifier as &dyn gs::Modifier<GaussianPod>],
    );

    queue.submit(Some(encoder.finish()));

    device
        .poll(wgpu::PollType::wait_indefinitely())
        .expect("poll");

    log::info!("Editing process completed in {:?}", time.elapsed());

    log::debug!("Downloading Gaussians");
    let modified_gaussians = editor
        .gaussians_buffer
        .download_gaussians(&device, &queue)
        .await
        .map(|gs| {
            match &args.output[args.output.len().saturating_sub(4)..] {
                ".ply" => {
                    gs::core::Gaussians::Ply(gs::core::PlyGaussians::from_iter(gs.into_iter()))
                }
                ".spz" => {
                    gs::core::Gaussians::Spz(
                        gs::core::SpzGaussians::from_gaussians_with_options(
                            gs,
                            &gs::core::SpzGaussiansFromGaussianSliceOptions {
                                version: 2, // Version 2 is more widely supported as of now
                                ..Default::default()
                            },
                        )
                        .expect("SpzGaussians from gaussians"),
                    )
                }
                _ => panic!("Unsupported output file extension, expected .ply or .spz"),
            }
        })
        .expect("gaussians download");

    log::debug!("Writing modified Gaussians to output file");
    modified_gaussians
        .write_to_file(&args.output)
        .expect("write modified Gaussians to output file");

    log::info!("Modified Gaussians written to {}", args.output);
}

pub fn intersection(self, other: Self) -> Self

Create a new SelectionExpr::Intersection.

pub fn difference(self, other: Self) -> Self

Create a new SelectionExpr::Difference.

pub fn symmetric_difference(self, other: Self) -> Self

Create a new SelectionExpr::SymmetricDifference.

pub fn complement(self) -> Self

Create a new SelectionExpr::Complement.

pub fn unary(self, op: usize, bind_groups: Vec<BindGroup>) -> Self

Create a new SelectionExpr::Unary.

pub fn binary(self, op: usize, other: Self, bind_groups: Vec<BindGroup>) -> Self

Create a new SelectionExpr::Binary.

pub fn selection(op: usize, bind_groups: Vec<BindGroup>) -> Self

Create a new SelectionExpr::Selection.

Examples found in repository

examples/filter_selection.rs (lines 187-190)

async fn main() {
    env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("info")).init();

    let args = Args::parse();
    let model_path = &args.model;
    let pos = Vec3::from_slice(&args.pos);
    let rot = Quat::from_slice(&args.rot);
    let scale = Vec3::from_slice(&args.scale);
    let shape = match args.shape {
        Shape::Sphere => gs::SelectionBundle::<GaussianPod>::create_sphere_bundle,
        Shape::Box => gs::SelectionBundle::<GaussianPod>::create_box_bundle,
    };
    let repeat = args.repeat;
    let offset = Vec3::from_slice(&args.offset);

    log::debug!("Creating wgpu instance");
    let instance =
        wgpu::Instance::new(wgpu::InstanceDescriptor::new_without_display_handle_from_env());

    log::debug!("Requesting adapter");
    let adapter = instance
        .request_adapter(&wgpu::RequestAdapterOptions::default())
        .await
        .expect("adapter");

    log::debug!("Requesting device");
    let (device, queue) = adapter
        .request_device(&wgpu::DeviceDescriptor {
            label: Some("Device"),
            required_limits: adapter.limits(),
            ..Default::default()
        })
        .await
        .expect("device");

    log::debug!("Creating gaussians");
    let gaussians = [
        gs::core::GaussiansSource::Ply,
        gs::core::GaussiansSource::Spz,
    ]
    .into_iter()
    .find_map(|source| gs::core::Gaussians::read_from_file(model_path, source).ok())
    .expect("gaussians");

    log::debug!("Creating gaussians buffer");
    let gaussians_buffer = gs::core::GaussiansBuffer::<GaussianPod>::new(&device, &gaussians);

    log::debug!("Creating model transform buffer");
    let model_transform = gs::core::ModelTransformBuffer::new(&device);

    log::debug!("Creating Gaussian transform buffer");
    let gaussian_transform = gs::core::GaussianTransformBuffer::new(&device);

    log::debug!("Creating shape selection compute bundle");
    let shape_selection = shape(&device);

    log::debug!("Creating selection bundle");
    let selection_bundle = gs::SelectionBundle::<GaussianPod>::new(&device, vec![shape_selection]);

    log::debug!("Creating shape selection buffers");
    let shape_selection_buffers = (0..repeat)
        .map(|i| {
            let offset_pos = pos + offset * i as f32;
            let buffer = gs::InvTransformBuffer::new(&device);
            buffer.update_with_scale_rot_pos(&queue, scale, rot, offset_pos);
            buffer
        })
        .collect::<Vec<_>>();

    log::debug!("Creating shape selection bind groups");
    let shape_selection_bind_groups = shape_selection_buffers
        .iter()
        .map(|buffer| {
            selection_bundle.bundles[0]
                .create_bind_group(
                    &device,
                    // index 0 is the Gaussians buffer, so we use 1,
                    // see docs of create_sphere_bundle or create_box_bundle
                    1,
                    [buffer.buffer().as_entire_binding()],
                )
                .expect("bind group")
        })
        .collect::<Vec<_>>();

    log::debug!("Creating selection expression");
    let selection_expr = shape_selection_bind_groups.into_iter().fold(
        gs::SelectionExpr::Identity,
        |acc, bind_group| {
            acc.union(gs::SelectionExpr::selection(
                0, // the 0 here is the bundle index in the selection bundle
                vec![bind_group],
            ))
        },
    );

    log::debug!("Creating destination buffer");
    let dest = gs::SelectionBuffer::new(&device, gaussians_buffer.len() as u32);

    log::info!("Starting selection process");
    let time = std::time::Instant::now();

    log::debug!("Selecting Gaussians");
    let mut encoder = device.create_command_encoder(&wgpu::CommandEncoderDescriptor {
        label: Some("Selection Encoder"),
    });

    selection_bundle.evaluate(
        &device,
        &mut encoder,
        &selection_expr,
        &dest,
        &model_transform,
        &gaussian_transform,
        &gaussians_buffer,
    );

    queue.submit(Some(encoder.finish()));

    device
        .poll(wgpu::PollType::wait_indefinitely())
        .expect("poll");

    log::info!("Editing process completed in {:?}", time.elapsed());

    log::debug!("Filtering Gaussians");
    let selected_gaussians = dest
        .download::<u32>(&device, &queue)
        .await
        .expect("selected download")
        .iter()
        .flat_map(|group| {
            std::iter::repeat_n(group, 32)
                .enumerate()
                .map(|(i, g)| g & (1 << i) != 0)
        })
        .zip(gaussians.iter_gaussian())
        .filter(|(selected, _)| *selected)
        .map(|(_, g)| g)
        .collect::<Vec<_>>();

    let selected_gaussians = match &args.output[args.output.len().saturating_sub(4)..] {
        ".ply" => gs::core::Gaussians::Ply(gs::core::PlyGaussians::from_iter(
            selected_gaussians.into_iter(),
        )),
        ".spz" => {
            gs::core::Gaussians::Spz(
                gs::core::SpzGaussians::from_gaussians_with_options(
                    selected_gaussians,
                    &gs::core::SpzGaussiansFromGaussianSliceOptions {
                        version: 2, // Version 2 is more widely supported as of now
                        ..Default::default()
                    },
                )
                .expect("SpzGaussians from gaussians"),
            )
        }
        _ => panic!("Unsupported output file extension, expected .ply or .spz"),
    };

    log::debug!("Writing modified Gaussians to output file");
    selected_gaussians
        .write_to_file(&args.output)
        .expect("write modified Gaussians to output file");

    log::info!("Filtered Gaussians written to {}", args.output);
}

examples/modify_selection.rs (lines 242-245)

async fn main() {
    env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("info")).init();

    let args = Args::parse();
    let model_path = &args.model;
    let pos = Vec3::from_slice(&args.pos);
    let rot = Quat::from_slice(&args.rot);
    let scale = Vec3::from_slice(&args.scale);
    let shape = match args.shape {
        Shape::Sphere => gs::SelectionBundle::<GaussianPod>::create_sphere_bundle,
        Shape::Box => gs::SelectionBundle::<GaussianPod>::create_box_bundle,
    };
    let repeat = args.repeat;
    let offset = Vec3::from_slice(&args.offset);

    log::debug!("Creating wgpu instance");
    let instance =
        wgpu::Instance::new(wgpu::InstanceDescriptor::new_without_display_handle_from_env());

    log::debug!("Requesting adapter");
    let adapter = instance
        .request_adapter(&wgpu::RequestAdapterOptions::default())
        .await
        .expect("adapter");

    log::debug!("Requesting device");
    let (device, queue) = adapter
        .request_device(&wgpu::DeviceDescriptor {
            label: Some("Device"),
            required_limits: adapter.limits(),
            ..Default::default()
        })
        .await
        .expect("device");

    log::debug!("Creating gaussians");
    let gaussians = [
        gs::core::GaussiansSource::Ply,
        gs::core::GaussiansSource::Spz,
    ]
    .into_iter()
    .find_map(|source| gs::core::Gaussians::read_from_file(model_path, source).ok())
    .expect("gaussians");

    log::debug!("Creating editor");
    let editor = gs::Editor::<GaussianPod>::new(&device, &gaussians);

    log::debug!("Creating shape selection compute bundle");
    let shape_selection = shape(&device);

    log::debug!("Creating basic selection modifier");
    let mut basic_selection_modifier = gs::SelectionModifier::new_with_basic_modifier(
        &device,
        &editor.gaussians_buffer,
        &editor.model_transform_buffer,
        &editor.gaussian_transform_buffer,
        vec![shape_selection],
    );

    log::debug!("Configuring modifiers");
    basic_selection_modifier
        .modifier
        .basic_color_modifiers_buffer
        .update(
            &queue,
            match args.override_rgb {
                true => gs::BasicColorRgbOverrideOrHsvModifiersPod::new_rgb_override,
                false => gs::BasicColorRgbOverrideOrHsvModifiersPod::new_hsv_modifiers,
            }(Vec3::from_slice(&args.rgb_or_hsv)),
            args.alpha,
            args.contrast,
            args.exposure,
            args.gamma,
        );

    log::debug!("Creating shape selection buffers");
    let shape_selection_buffers = (0..repeat)
        .map(|i| {
            let offset_pos = pos + offset * i as f32;
            let buffer = gs::InvTransformBuffer::new(&device);
            buffer.update_with_scale_rot_pos(&queue, scale, rot, offset_pos);
            buffer
        })
        .collect::<Vec<_>>();

    log::debug!("Creating shape selection bind groups");
    let shape_selection_bind_groups = shape_selection_buffers
        .iter()
        .map(|buffer| {
            basic_selection_modifier.selection.bundles[0]
                .create_bind_group(
                    &device,
                    // index 0 is the Gaussians buffer, so we use 1,
                    // see docs of create_sphere_bundle or create_box_bundle
                    1,
                    [buffer.buffer().as_entire_binding()],
                )
                .expect("bind group")
        })
        .collect::<Vec<_>>();

    log::debug!("Creating selection expression");
    basic_selection_modifier.selection_expr = shape_selection_bind_groups.into_iter().fold(
        gs::SelectionExpr::Identity,
        |acc, bind_group| {
            acc.union(gs::SelectionExpr::selection(
                0, // the 0 here is the bundle index in the selection bundle
                vec![bind_group],
            ))
        },
    );

    log::info!("Starting editing process");
    let time = std::time::Instant::now();

    log::debug!("Editing Gaussians");
    let mut encoder = device.create_command_encoder(&wgpu::CommandEncoderDescriptor {
        label: Some("Edit Encoder"),
    });

    editor.apply(
        &device,
        &mut encoder,
        [&basic_selection_modifier as &dyn gs::Modifier<GaussianPod>],
    );

    queue.submit(Some(encoder.finish()));

    device
        .poll(wgpu::PollType::wait_indefinitely())
        .expect("poll");

    log::info!("Editing process completed in {:?}", time.elapsed());

    log::debug!("Downloading Gaussians");
    let modified_gaussians = editor
        .gaussians_buffer
        .download_gaussians(&device, &queue)
        .await
        .map(|gs| {
            match &args.output[args.output.len().saturating_sub(4)..] {
                ".ply" => {
                    gs::core::Gaussians::Ply(gs::core::PlyGaussians::from_iter(gs.into_iter()))
                }
                ".spz" => {
                    gs::core::Gaussians::Spz(
                        gs::core::SpzGaussians::from_gaussians_with_options(
                            gs,
                            &gs::core::SpzGaussiansFromGaussianSliceOptions {
                                version: 2, // Version 2 is more widely supported as of now
                                ..Default::default()
                            },
                        )
                        .expect("SpzGaussians from gaussians"),
                    )
                }
                _ => panic!("Unsupported output file extension, expected .ply or .spz"),
            }
        })
        .expect("gaussians download");

    log::debug!("Writing modified Gaussians to output file");
    modified_gaussians
        .write_to_file(&args.output)
        .expect("write modified Gaussians to output file");

    log::info!("Modified Gaussians written to {}", args.output);
}

examples/custom_modify_selection.rs (lines 330-344)

async fn main() {
    env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("info")).init();

    let args = Args::parse();
    let model_path = &args.model;
    let pos = Vec3::from_slice(&args.pos);
    let radius = args.radius;

    log::debug!("Creating wgpu instance");
    let instance =
        wgpu::Instance::new(wgpu::InstanceDescriptor::new_without_display_handle_from_env());

    log::debug!("Requesting adapter");
    let adapter = instance
        .request_adapter(&wgpu::RequestAdapterOptions::default())
        .await
        .expect("adapter");

    log::debug!("Requesting device");
    let (device, queue) = adapter
        .request_device(&wgpu::DeviceDescriptor {
            label: Some("Device"),
            required_limits: adapter.limits(),
            ..Default::default()
        })
        .await
        .expect("device");

    log::debug!("Creating gaussians");
    let gaussians = [
        gs::core::GaussiansSource::Ply,
        gs::core::GaussiansSource::Spz,
    ]
    .into_iter()
    .find_map(|source| gs::core::Gaussians::read_from_file(model_path, source).ok())
    .expect("gaussians");

    log::debug!("Creating editor");
    let editor = gs::Editor::<GaussianPod>::new(&device, &gaussians);

    log::debug!("Creating buffers");
    let pos_buffer = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
        label: Some("Position Buffer"),
        contents: bytemuck::bytes_of(&pos),
        usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
    });

    let radius_buffer = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
        label: Some("Radius Buffer"),
        contents: bytemuck::bytes_of(&radius),
        usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
    });

    const BIND_GROUP_LAYOUT_DESCRIPTOR: wgpu::BindGroupLayoutDescriptor =
        wgpu::BindGroupLayoutDescriptor {
            label: Some("Bind Group Layout"),
            entries: &[
                // Position uniform buffer
                wgpu::BindGroupLayoutEntry {
                    binding: 0,
                    visibility: wgpu::ShaderStages::COMPUTE,
                    ty: wgpu::BindingType::Buffer {
                        ty: wgpu::BufferBindingType::Uniform,
                        has_dynamic_offset: false,
                        min_binding_size: None,
                    },
                    count: None,
                },
                // Radius uniform buffer
                wgpu::BindGroupLayoutEntry {
                    binding: 1,
                    visibility: wgpu::ShaderStages::COMPUTE,
                    ty: wgpu::BindingType::Buffer {
                        ty: wgpu::BufferBindingType::Uniform,
                        has_dynamic_offset: false,
                        min_binding_size: None,
                    },
                    count: None,
                },
                // Selection buffer (only in modifier pipeline)
                wgpu::BindGroupLayoutEntry {
                    binding: 2,
                    visibility: wgpu::ShaderStages::COMPUTE,
                    ty: wgpu::BindingType::Buffer {
                        ty: wgpu::BufferBindingType::Storage { read_only: true },
                        has_dynamic_offset: false,
                        min_binding_size: None,
                    },
                    count: None,
                },
            ],
        };

    log::debug!("Creating cylinder selection compute bundle");
    let cylinder_selection_bundle = gs::core::ComputeBundleBuilder::new()
        .label("Selection")
        .bind_group_layouts([
            &gs::SelectionBundle::<GaussianPod>::GAUSSIANS_BIND_GROUP_LAYOUT_DESCRIPTOR,
            &wgpu::BindGroupLayoutDescriptor {
                entries: &BIND_GROUP_LAYOUT_DESCRIPTOR.entries[..2],
                ..BIND_GROUP_LAYOUT_DESCRIPTOR
            },
        ])
        .main_shader("package::selection".parse().unwrap())
        .entry_point("main")
        .wesl_compile_options(wesl::CompileOptions {
            features: GaussianPod::wesl_features(),
            ..Default::default()
        })
        .resolver({
            let mut resolver =
                wesl::StandardResolver::new("examples/shader/custom_modify_selection");
            resolver.add_package(&gs::core::shader::PACKAGE);
            resolver
        })
        .build_without_bind_groups(&device)
        .map_err(|e| log::error!("{e}"))
        .expect("selection bundle");

    log::debug!("Creating custom modifier");
    #[allow(dead_code)]
    let modifier_factory = |selection_buffer: &gs::SelectionBuffer| /* -> impl gs::Modifier<GaussianPod> */ {
            log::debug!("Creating custom modifier compute bundle");
            let modifier_bundle = gs::core::ComputeBundleBuilder::new()
                .label("Modifier")
                .bind_group_layouts([
                    &gs::MODIFIER_GAUSSIANS_BIND_GROUP_LAYOUT_DESCRIPTOR,
                    &BIND_GROUP_LAYOUT_DESCRIPTOR,
                ])
                .resolver({
                    let mut resolver =
                        wesl::StandardResolver::new("examples/shader/custom_modify_selection");
                    resolver.add_package(&gs::core::shader::PACKAGE);
                    resolver.add_package(&gs::shader::PACKAGE);
                    resolver
                })
                .main_shader("package::modifier".parse().unwrap())
                .entry_point("main")
                .wesl_compile_options(wesl::CompileOptions {
                    features: GaussianPod::wesl_features(),
                    ..Default::default()
                })
                .build(
                    &device,
                    [
                        vec![
                            editor.gaussians_buffer.buffer().as_entire_binding(),
                            editor.model_transform_buffer.buffer().as_entire_binding(),
                            editor
                                .gaussian_transform_buffer
                                .buffer()
                                .as_entire_binding(),
                        ],
                        vec![
                            pos_buffer.as_entire_binding(),
                            radius_buffer.as_entire_binding(),
                            selection_buffer.buffer().as_entire_binding(),
                        ],
                    ],
                )
                .map_err(|e| log::error!("{e}"))
                .expect("modifier bundle");

            // This is a modifier closure because this function signature has blanket impl of the modifier trait
            move |_device: &wgpu::Device,
                  encoder: &mut wgpu::CommandEncoder,
                  gaussians: &gs::core::GaussiansBuffer<GaussianPod>,
                  _model_transform: &gs::core::ModelTransformBuffer,
                  _gaussian_transform: &gs::core::GaussianTransformBuffer| {
                  modifier_bundle.dispatch(encoder, gaussians.len() as u32);
            }
        };

    #[allow(dead_code)]
    struct Modifier<G: gs::core::GaussianPod>(gs::core::ComputeBundle, std::marker::PhantomData<G>);

    impl<G: gs::core::GaussianPod> Modifier<G> {
        #[allow(dead_code)]
        fn new(
            device: &wgpu::Device,
            editor: &gs::Editor<G>,
            pos_buffer: &wgpu::Buffer,
            radius_buffer: &wgpu::Buffer,
            selection_buffer: &gs::SelectionBuffer,
        ) -> Self {
            log::debug!("Creating custom modifier compute bundle");
            let modifier_bundle = gs::core::ComputeBundleBuilder::new()
                .label("Modifier")
                .bind_group_layouts([
                    &gs::MODIFIER_GAUSSIANS_BIND_GROUP_LAYOUT_DESCRIPTOR,
                    &BIND_GROUP_LAYOUT_DESCRIPTOR,
                ])
                .resolver({
                    let mut resolver =
                        wesl::StandardResolver::new("examples/shader/custom_modify_selection");
                    resolver.add_package(&gs::core::shader::PACKAGE);
                    resolver.add_package(&gs::shader::PACKAGE);
                    resolver
                })
                .main_shader("package::modifier".parse().unwrap())
                .entry_point("main")
                .wesl_compile_options(wesl::CompileOptions {
                    features: GaussianPod::wesl_features(),
                    ..Default::default()
                })
                .build(
                    device,
                    [
                        vec![
                            editor.gaussians_buffer.buffer().as_entire_binding(),
                            editor.model_transform_buffer.buffer().as_entire_binding(),
                            editor
                                .gaussian_transform_buffer
                                .buffer()
                                .as_entire_binding(),
                        ],
                        vec![
                            pos_buffer.as_entire_binding(),
                            radius_buffer.as_entire_binding(),
                            selection_buffer.buffer().as_entire_binding(),
                        ],
                    ],
                )
                .map_err(|e| log::error!("{e}"))
                .expect("modifier bundle");

            Self(modifier_bundle, std::marker::PhantomData)
        }
    }

    impl<G: gs::core::GaussianPod> gs::Modifier<G> for Modifier<G> {
        fn apply(
            &self,
            _device: &wgpu::Device,
            encoder: &mut wgpu::CommandEncoder,
            gaussians: &gs::core::GaussiansBuffer<G>,
            _model_transform: &gs::core::ModelTransformBuffer,
            _gaussian_transform: &gs::core::GaussianTransformBuffer,
        ) {
            self.0.dispatch(encoder, gaussians.len() as u32);
        }
    }

    log::debug!("Creating selection modifier");
    let mut selection_modifier = gs::SelectionModifier::<GaussianPod, _>::new(
        &device,
        &editor.gaussians_buffer,
        vec![cylinder_selection_bundle],
        modifier_factory,
        // Uncomment the following line to use modifier struct instead of closure
        // |selection_buffer| {
        //     Modifier::new(
        //         &device,
        //         &editor,
        //         &pos_buffer,
        //         &radius_buffer,
        //         selection_buffer,
        //     )
        // },
    );

    log::debug!("Creating selection expression");
    selection_modifier.selection_expr = gs::SelectionExpr::selection(
        0,
        vec![
            selection_modifier.selection.bundles[0]
                .create_bind_group(
                    &device,
                    1, // index 0 is the Gaussians buffer, so we use 1,
                    [
                        pos_buffer.as_entire_binding(),
                        radius_buffer.as_entire_binding(),
                    ],
                )
                .expect("selection expr bind group"),
        ],
    );

    log::info!("Starting editing process");
    let time = std::time::Instant::now();

    log::debug!("Editing Gaussians");
    let mut encoder = device.create_command_encoder(&wgpu::CommandEncoderDescriptor {
        label: Some("Edit Encoder"),
    });

    editor.apply(
        &device,
        &mut encoder,
        [&selection_modifier as &dyn gs::Modifier<GaussianPod>],
    );

    queue.submit(Some(encoder.finish()));

    device
        .poll(wgpu::PollType::wait_indefinitely())
        .expect("poll");

    log::info!("Editing process completed in {:?}", time.elapsed());

    log::debug!("Downloading Gaussians");
    let modified_gaussians = editor
        .gaussians_buffer
        .download_gaussians(&device, &queue)
        .await
        .map(|gs| {
            match &args.output[args.output.len().saturating_sub(4)..] {
                ".ply" => {
                    gs::core::Gaussians::Ply(gs::core::PlyGaussians::from_iter(gs.into_iter()))
                }
                ".spz" => {
                    gs::core::Gaussians::Spz(
                        gs::core::SpzGaussians::from_gaussians_with_options(
                            gs,
                            &gs::core::SpzGaussiansFromGaussianSliceOptions {
                                version: 2, // Version 2 is more widely supported as of now
                                ..Default::default()
                            },
                        )
                        .expect("SpzGaussians from gaussians"),
                    )
                }
                _ => panic!("Unsupported output file extension, expected .ply or .spz"),
            }
        })
        .expect("gaussians download");

    log::debug!("Writing modified Gaussians to output file");
    modified_gaussians
        .write_to_file(&args.output)
        .expect("write modified Gaussians to output file");

    log::info!("Modified Gaussians written to {}", args.output);
}

pub fn buffer(buffer: SelectionBuffer) -> Self

Create a new SelectionExpr::Buffer.

pub fn update_with(&mut self, f: impl FnOnce(Self) -> Self)

Update the expression in place.

pub fn as_u32(&self) -> Option<u32>

Get the u32 associated with this expression’s operation.

The value returned is not the same as that returned by SelectionExpr::custom_op_index, but rather a value that can be used to identify the operation by the compute shader, custom operation’s index are offset by SelectionExpr::CUSTOM_OP_START.

You usually do not need to use this method, it is used internally for evaluation of the compute shader.

pub fn is_identity(&self) -> bool

Whether this expression is an identity operation.

pub fn is_primitive(&self) -> bool

Whether this expression is a primitive operation.

pub fn is_custom(&self) -> bool

Whether this expression is a custom operation.

pub fn is_operation(&self) -> bool

Whether this expression is a selection operation.

pub fn is_buffer(&self) -> bool

Whether this expression is a selection buffer.

pub fn custom_op_index(&self) -> Option<usize>

Get the custom operation index.

This is the index of the custom operation in SelectionBundle::bundles vector.

pub fn custom_bind_groups(&self) -> Option<&Vec<BindGroup>>

Get the custom operation bind groups for this expression.

pub fn custom_op_index_and_bind_groups( &self, ) -> Option<(usize, &Vec<BindGroup>)>

Get the custom operation index and bind groups for this expression.

Trait Implementations

impl Debug for SelectionExpr

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for SelectionExpr

fn default() -> SelectionExpr

Returns the “default value” for a type.