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Support TriMesh collision shapes loaded from gltf
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| use std::unimplemented; | ||
|
|
||
| #[derive(Default)] | ||
| pub struct TriMesh { | ||
| pub points: Vec<nalgebra::Point3<f32>>, | ||
| pub triangles: Vec<[u32; 3]>, | ||
| } | ||
|
|
||
| impl TriMesh { | ||
| fn populate_from_gltf( | ||
| &mut self, | ||
| g_node: gltf::Node, | ||
| parent_transform: nalgebra::Matrix4<f32>, | ||
| data_buffers: &[Vec<u8>], | ||
| ) { | ||
| let name = g_node.name().unwrap_or(""); | ||
| let transform = parent_transform * nalgebra::Matrix4::from(g_node.transform().matrix()); | ||
|
|
||
| for child in g_node.children() { | ||
| self.populate_from_gltf(child, transform, data_buffers); | ||
| } | ||
|
|
||
| let g_mesh = match g_node.mesh() { | ||
| Some(mesh) => mesh, | ||
| None => return, | ||
| }; | ||
|
|
||
| for (prim_index, g_primitive) in g_mesh.primitives().enumerate() { | ||
| if g_primitive.mode() != gltf::mesh::Mode::Triangles { | ||
| log::warn!( | ||
| "Skipping primitive '{}'[{}] for having mesh mode {:?}", | ||
| name, | ||
| prim_index, | ||
| g_primitive.mode() | ||
| ); | ||
| continue; | ||
| } | ||
|
|
||
| let reader = g_primitive.reader(|buffer| Some(&data_buffers[buffer.index()])); | ||
|
|
||
| // Read the vertices into memory | ||
| profiling::scope!("Read data"); | ||
| let base_vertex = self.points.len() as u32; | ||
|
|
||
| match reader.read_indices() { | ||
| Some(read) => { | ||
| let mut read_u32 = read.into_u32(); | ||
| let tri_count = read_u32.len() / 3; | ||
| for _ in 0..tri_count { | ||
| let mut tri = [0u32; 3]; | ||
| for index in tri.iter_mut() { | ||
| *index = base_vertex + read_u32.next().unwrap(); | ||
| } | ||
| self.triangles.push(tri); | ||
| } | ||
| } | ||
| None => { | ||
| log::warn!("Missing index buffer for '{name}'"); | ||
| continue; | ||
| } | ||
| } | ||
|
|
||
| for pos in reader.read_positions().unwrap() { | ||
| let point = transform.transform_point(&pos.into()); | ||
| self.points.push(point); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| pub fn load(path: &str) -> TriMesh { | ||
| use base64::engine::{general_purpose::URL_SAFE as ENCODING_ENGINE, Engine as _}; | ||
|
|
||
| let gltf::Gltf { document, mut blob } = gltf::Gltf::open(path).unwrap(); | ||
| // extract buffers | ||
| let mut data_buffers = Vec::new(); | ||
| for buffer in document.buffers() { | ||
| let mut data = match buffer.source() { | ||
| gltf::buffer::Source::Uri(uri) => { | ||
| if let Some(rest) = uri.strip_prefix("data:") { | ||
| let (_before, after) = rest.split_once(";base64,").unwrap(); | ||
| ENCODING_ENGINE.decode(after).unwrap() | ||
| } else { | ||
| unimplemented!("Unexpected reference to external file: {uri}"); | ||
| } | ||
| } | ||
| gltf::buffer::Source::Bin => blob.take().unwrap(), | ||
| }; | ||
| assert!(data.len() >= buffer.length()); | ||
| while data.len() % 4 != 0 { | ||
| data.push(0); | ||
| } | ||
| data_buffers.push(data); | ||
| } | ||
|
|
||
| let scene = document.scenes().next().expect("Document has no scenes?"); | ||
| let mut trimesh = TriMesh::default(); | ||
| for g_node in scene.nodes() { | ||
| trimesh.populate_from_gltf(g_node, nalgebra::Matrix4::identity(), &data_buffers); | ||
| } | ||
| trimesh | ||
| } |