Struct SubSelectionRef 

pub struct SubSelectionRef {
    pub version: u64,
    /* private fields */
}

A renderer-owned snapshot of a SubSelection taken at frame submission time.

Bundles the selection items with the CPU-side mesh and point cloud data the renderer needs to build highlight geometry. The renderer does not hold a reference to any app-owned data between frames.

Usage

fd.interaction.sub_selection = Some(SubSelectionRef::new(
    &self.sub_selection,
    mesh_lookup,
    model_matrices,
    point_positions,
));

Fields

version: u64

Version counter copied from the source SubSelection::version().

The renderer uses this to skip GPU buffer rebuilds when the selection has not changed since the previous frame.

Implementations

impl SubSelectionRef

pub fn new( sub_selection: &SubSelection, mesh_lookup: HashMap<u64, (Vec<[f32; 3]>, Vec<u32>)>, model_matrices: HashMap<u64, Mat4>, point_positions: HashMap<u64, Vec<[f32; 3]>>, ) -> Self

Create a snapshot from a live SubSelection.

• mesh_lookup : CPU positions + indices per node id (same type as the mesh_lookup argument to the CPU pick functions).
• model_matrices : world transform per node id.
• point_positions : point cloud positions per node id (for SubObjectRef::Point entries).

pub fn with_voxels(self, lookup: HashMap<u64, VolumeSelectionInfo>) -> Self

Attach volume geometry info for SubObjectRef::Voxel highlight rendering.

lookup maps each volume’s node id to its VolumeSelectionInfo. Without this, selected voxels are silently skipped during highlight geometry build.

pub fn with_cells(self, lookup: HashMap<u64, CellSelectionInfo>) -> Self

Attach unstructured volume mesh geometry for SubObjectRef::Cell highlight rendering.

lookup maps each volume mesh’s node id to its CellSelectionInfo. Without this, selected cells are silently skipped during highlight geometry build.

pub fn with_polylines(self, lookup: HashMap<u64, PolylineSelectionInfo>) -> Self

Attach polyline geometry for SubObjectRef::Point, SubObjectRef::Segment, and SubObjectRef::Strip highlight rendering.

lookup maps each polyline item’s node id to its PolylineSelectionInfo. Without this, selected polyline nodes and segments are silently skipped during highlight geometry build.

pub fn with_curve_families( self, lookup: HashMap<u64, PolylineSelectionInfo>, ) -> Self

Attach curve-family geometry for SubObjectRef::Segment and SubObjectRef::Strip highlight rendering on streamtube, tube, and ribbon items.

lookup maps each item’s node id to a PolylineSelectionInfo (same positions / strip_lengths encoding). Without this, selected segments and strips on these types are silently skipped during highlight geometry build.

pub fn is_empty(&self) -> bool

Returns true if the snapshot contains no selected sub-objects.