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GLTF loader: handle warning NODE_SKINNED_MESH_WITHOUT_SKIN (#9360)
# Objective - According to the GLTF spec, it should not be possible to have a non skinned mesh on a skinned node > When the node contains skin, all mesh.primitives MUST contain JOINTS_0 and WEIGHTS_0 attributes > https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html#reference-node - However, the reverse (a skinned mesh on a non skinned node) is just a warning, see `NODE_SKINNED_MESH_WITHOUT_SKIN` in https://github.com/KhronosGroup/glTF-Validator/blob/main/ISSUES.md#linkerror - This causes a crash in Bevy because the bind group layout is made from the mesh which is skinned, but filled from the entity which is not ``` thread '<unnamed>' panicked at 'wgpu error: Validation Error Caused by: In a RenderPass note: encoder = `<CommandBuffer-(0, 5, Metal)>` In a set_bind_group command note: bind group = `<BindGroup-(27, 1, Metal)>` Bind group 2 expects 2 dynamic offsets. However 1 dynamic offset were provided. ``` - Blender can export GLTF files with this kind of issues ## Solution - When a skinned mesh is only used on non skinned nodes, ignore skinned information from the mesh and warn the user (this is what three.js is doing) - When a skinned mesh is used on both skinned and non skinned nodes, log an error
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1 changed files with 25 additions and 2 deletions
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@ -6,7 +6,7 @@ use bevy_core::Name;
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use bevy_core_pipeline::prelude::Camera3dBundle;
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use bevy_ecs::{entity::Entity, world::World};
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use bevy_hierarchy::{BuildWorldChildren, WorldChildBuilder};
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use bevy_log::warn;
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use bevy_log::{error, warn};
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use bevy_math::{Mat4, Vec3};
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use bevy_pbr::{
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AlphaMode, DirectionalLight, DirectionalLightBundle, PbrBundle, PointLight, PointLightBundle,
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@ -36,7 +36,7 @@ use gltf::{
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accessor::Iter,
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mesh::{util::ReadIndices, Mode},
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texture::{MagFilter, MinFilter, WrappingMode},
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Material, Node, Primitive,
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Material, Node, Primitive, Semantic,
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};
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use serde::Deserialize;
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use std::{
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@ -329,6 +329,17 @@ async fn load_gltf<'a, 'b, 'c>(
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let mut meshes = vec![];
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let mut named_meshes = HashMap::default();
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let mut meshes_on_skinned_nodes = HashSet::default();
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let mut meshes_on_non_skinned_nodes = HashSet::default();
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for gltf_node in gltf.nodes() {
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if gltf_node.skin().is_some() {
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if let Some(mesh) = gltf_node.mesh() {
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meshes_on_skinned_nodes.insert(mesh.index());
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}
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} else if let Some(mesh) = gltf_node.mesh() {
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meshes_on_non_skinned_nodes.insert(mesh.index());
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}
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}
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for gltf_mesh in gltf.meshes() {
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let mut primitives = vec![];
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for primitive in gltf_mesh.primitives() {
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@ -339,6 +350,18 @@ async fn load_gltf<'a, 'b, 'c>(
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// Read vertex attributes
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for (semantic, accessor) in primitive.attributes() {
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if [Semantic::Joints(0), Semantic::Weights(0)].contains(&semantic) {
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if !meshes_on_skinned_nodes.contains(&gltf_mesh.index()) {
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warn!(
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"Ignoring attribute {:?} for skinned mesh {:?} used on non skinned nodes (NODE_SKINNED_MESH_WITHOUT_SKIN)",
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semantic,
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primitive_label
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);
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continue;
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} else if meshes_on_non_skinned_nodes.contains(&gltf_mesh.index()) {
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error!("Skinned mesh {:?} used on both skinned and non skin nodes, this is likely to cause an error (NODE_SKINNED_MESH_WITHOUT_SKIN)", primitive_label);
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}
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}
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match convert_attribute(
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semantic,
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accessor,
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