Crate draco_core 

Core Draco geometry compression primitives.

draco-core implements the raw Draco .drc bitstream layer for triangle meshes and point clouds. It intentionally stops at the geometry compression model: file containers such as glTF/GLB, OBJ, PLY, and FBX live in draco-io.

Main Entry Points

• Mesh and PointCloud hold decoded geometry.
• PointAttribute stores typed attribute data such as positions, normals, colors, texture coordinates, and generic attributes.
• Metadata, GeometryMetadata, and AttributeMetadata expose raw Draco metadata plus C++-compatible typed helpers.
• With the encoder feature, use MeshEncoder or PointCloudEncoder.
• With the decoder feature, use MeshDecoder or PointCloudDecoder.

Features

The default feature set enables both encoding and decoding, point-cloud KD-tree decoding, EdgeBreaker valence traversal, and legacy bitstream compatibility helpers. Disable default features when embedding only the geometry data model or one codec direction is needed.

Metadata

Draco metadata entries are stored as untyped byte blobs in the bitstream. The typed helpers on Metadata write the same bytes used by C++ Draco convenience APIs for int32, double, arrays, and strings.

Example

use draco_core::{DecoderBuffer, Mesh, MeshDecoder};

let bytes = std::fs::read("mesh.drc")?;
let mut buffer = DecoderBuffer::new(&bytes);
let mut mesh = Mesh::new();
MeshDecoder::new().decode(&mut buffer, &mut mesh)?;
println!("decoded {} faces", mesh.num_faces());

Re-exports

pub use draco_types::DataType;

pub use geometry_attribute::GeometryAttribute;

pub use geometry_attribute::GeometryAttributeType;

pub use geometry_attribute::PointAttribute;

pub use geometry_indices::AttributeValueIndex;

pub use geometry_indices::FaceIndex;

pub use geometry_indices::PointIndex;

pub use keyframe_animation::KeyframeAnimation;

pub use mesh::Mesh;

pub use metadata::AttributeMetadata;

pub use metadata::GeometryMetadata;

pub use metadata::Metadata;

pub use point_cloud::PointCloud;

pub use status::DracoError;

pub use status::Status;

pub use decoder_buffer::DecoderBuffer;decoder

pub use keyframe_animation_decoder::KeyframeAnimationDecoder;decoder and point_cloud_decode

pub use mesh_decoder::MeshDecoder;decoder

pub use point_cloud_decoder::PointCloudDecoder;decoder

pub use encoder_buffer::EncoderBuffer;encoder

pub use encoder_options::EncoderOptions;encoder

pub use keyframe_animation_encoder::KeyframeAnimationEncoder;encoder

pub use mesh_encoder::EncodedAttributeInfo;encoder

pub use mesh_encoder::EncodedMeshInfo;encoder

pub use mesh_encoder::MeshEncoder;encoder

pub use point_cloud_encoder::PointCloudEncoder;encoder

Modules

decoder_bufferdecoder

Decoder input buffer.

draco_types

Draco scalar data type identifiers.

encoder_bufferencoder

Encoder output buffer.

encoder_optionsencoder

Encoder configuration options.

geometry_attribute

Geometry attribute descriptors and point attribute storage.

geometry_indices

Strongly typed geometry index wrappers.

keyframe_animation

Keyframe animation container built on the point-cloud path. Keyframe animation container built on top of PointCloud.

keyframe_animation_decoderdecoder and point_cloud_decode

Keyframe animation decoder entry point. Decoder for KeyframeAnimation.

keyframe_animation_encoderencoder

Keyframe animation encoder entry point. Encoder for KeyframeAnimation.

mesh

Triangle mesh geometry data.

mesh_decoderdecoder

Mesh decoder entry point.

mesh_encoderencoder

Mesh encoder entry point.

metadata

Draco metadata containers and bitstream serialization helpers.

point_cloud

Point cloud geometry data.

point_cloud_decoderdecoder

Point cloud decoder entry point.

point_cloud_encoderencoder

Point cloud encoder entry point.

status

Error and status types.