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rbx_loader: do not generate empty polygon groups

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This commit is contained in:
Rhys Lloyd
2026-03-05 08:24:45 -08:00
parent 7a3ea40551
commit 298a7fcbde
1 changed files with 17 additions and 11 deletions
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28
lib/rbx_loader/src/union.rs
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@@ -172,12 +172,12 @@ pub fn convert(
size:glam::Vec3,
RobloxPartDescription(part_texture_description):RobloxPartDescription,
)->Result<MeshWithSize,Error>{
let mut polygon_groups_normal_id:[_;NORMAL_FACES]=[vec![],vec![],vec![],vec![],vec![],vec![]];
// build graphics and physics meshes
let mut mb=MeshBuilder::new();
// graphics
let graphics_groups=if !roblox_mesh_data.is_empty(){
let (polygon_groups_normal_id,graphics_groups)=if !roblox_mesh_data.is_empty(){
let mut polygon_groups_normal_id:[_;NORMAL_FACES]=[vec![],vec![],vec![],vec![],vec![],vec![]];
// create per-face texture coordinate affine transforms
let cube_face_description=part_texture_description.map(|opt|opt.map(|mut t|{
t.transform.set_size(1.0,1.0);
@@ -193,18 +193,24 @@ pub fn convert(
rbx_mesh::mesh_data::MeshData::CSGMDL(rbx_mesh::mesh_data::CSGMDL::V4(mesh_data4))=>build_mesh2(&mut mb,&mut polygon_groups_normal_id,&cube_face_description,mesh_data4.mesh)?,
rbx_mesh::mesh_data::MeshData::CSGMDL(rbx_mesh::mesh_data::CSGMDL::V5(mesh_data4))=>build_mesh5(&mut mb,&mut polygon_groups_normal_id,&cube_face_description,mesh_data4)?,
};
(0..NORMAL_FACES).map(|polygon_group_id|{
model::IndexedGraphicsGroup{
render:cube_face_description[polygon_group_id].as_ref().map_or(RenderConfigId::new(0),|face_description|face_description.render),
groups:vec![PolygonGroupId::new(polygon_group_id as u32)]
}
}).collect()
let graphics_groups=polygon_groups_normal_id
.iter()
.enumerate()
.filter(|&(_,group)|!group.is_empty())
.enumerate()
.map(|(polygon_group_id,(normal_id,_))|{
model::IndexedGraphicsGroup{
render:cube_face_description[normal_id].as_ref().map_or(RenderConfigId::new(0),|face_description|face_description.render),
groups:vec![PolygonGroupId::new(polygon_group_id as u32)]
}
}).collect();
(polygon_groups_normal_id,graphics_groups)
}else{
Vec::new()
([vec![],vec![],vec![],vec![],vec![],vec![]],Vec::new())
};
//physics
let polygon_groups_normal_it=polygon_groups_normal_id.into_iter().map(|faces|
let polygon_groups_normal_it=polygon_groups_normal_id.into_iter().filter(|group|!group.is_empty()).map(|faces|
// graphics polygon groups (to be rendered)
PolygonGroup::PolygonList(PolygonList::new(faces))
);
@@ -257,7 +263,7 @@ pub fn convert(
).to_vec()).to_vec()));
polygon_groups_normal_it.chain([polygon_group]).collect()
};
let physics_groups=(NORMAL_FACES..polygon_groups.len()).map(|id|model::IndexedPhysicsGroup{
let physics_groups=(graphics_groups.len()..polygon_groups.len()).map(|id|model::IndexedPhysicsGroup{
groups:vec![PolygonGroupId::new(id as u32)]
}).collect();
let mesh=mb.build(