mirror of
https://github.com/bevyengine/bevy
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78a3aae81b
# Objective - fixes https://github.com/bevyengine/bevy/issues/13473 ## Solution - When a single mesh is assigned multiple materials, it is divided into several primitive nodes, with each primitive assigned a unique material. Presently, these primitives are named using the format Mesh.index, which complicates querying. To improve this, we can assign a specific name to each primitive based on the material’s name, since each primitive corresponds to one material exclusively. ## Testing - I have included a simple example which shows how to query a material and mesh part based on the new name component. ## Changelog - adds `GltfMaterialName` component to the mesh entity of the gltf primitive node. --------- Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
96 lines
3.3 KiB
Rust
96 lines
3.3 KiB
Rust
//! This example demonstrates how to query a [`StandardMaterial`] within a glTF scene.
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//! It is particularly useful for glTF scenes with a mesh that consists of multiple primitives.
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use std::f32::consts::PI;
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use bevy::{
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gltf::GltfMaterialName,
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pbr::{CascadeShadowConfigBuilder, DirectionalLightShadowMap},
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prelude::*,
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render::mesh::VertexAttributeValues,
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};
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fn main() {
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App::new()
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.insert_resource(DirectionalLightShadowMap { size: 4096 })
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.add_plugins(DefaultPlugins)
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.add_systems(Startup, setup)
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.add_systems(Update, find_top_material_and_mesh)
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.run();
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}
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fn find_top_material_and_mesh(
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mut materials: ResMut<Assets<StandardMaterial>>,
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mut meshes: ResMut<Assets<Mesh>>,
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time: Res<Time>,
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mat_query: Query<(&Handle<StandardMaterial>, &Handle<Mesh>, &GltfMaterialName)>,
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) {
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for (mat_handle, mesh_handle, name) in mat_query.iter() {
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// locate a material by material name
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if name.0 == "Top" {
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if let Some(material) = materials.get_mut(mat_handle) {
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if let Color::Hsla(ref mut hsla) = material.base_color {
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*hsla = hsla.rotate_hue(time.delta_seconds() * 100.0);
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} else {
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material.base_color = Color::from(Hsla::hsl(0.0, 0.8, 0.5));
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}
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}
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if let Some(mesh) = meshes.get_mut(mesh_handle) {
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if let Some(VertexAttributeValues::Float32x3(positions)) =
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mesh.attribute_mut(Mesh::ATTRIBUTE_POSITION)
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{
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positions[0] = (
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ops::sin(2.0 * PI * time.elapsed_seconds()),
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positions[0][1],
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positions[0][2],
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)
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.into();
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}
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}
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}
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}
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}
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fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
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commands.spawn((
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Camera3dBundle {
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transform: Transform::from_xyz(0.6, 1.6, 11.3)
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.looking_at(Vec3::new(0.0, 0.0, 3.0), Vec3::Y),
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..default()
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},
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EnvironmentMapLight {
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diffuse_map: asset_server.load("environment_maps/pisa_diffuse_rgb9e5_zstd.ktx2"),
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specular_map: asset_server.load("environment_maps/pisa_specular_rgb9e5_zstd.ktx2"),
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intensity: 500.0,
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rotation: Quat::IDENTITY,
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},
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));
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commands.spawn(DirectionalLightBundle {
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directional_light: DirectionalLight {
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shadows_enabled: true,
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..default()
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},
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// This is a relatively small scene, so use tighter shadow
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// cascade bounds than the default for better quality.
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// We also adjusted the shadow map to be larger since we're
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// only using a single cascade.
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cascade_shadow_config: CascadeShadowConfigBuilder {
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num_cascades: 1,
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maximum_distance: 1.6,
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..default()
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}
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.into(),
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..default()
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});
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commands.spawn(SceneBundle {
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scene: asset_server
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.load(GltfAssetLabel::Scene(0).from_asset("models/GltfPrimitives/gltf_primitives.glb")),
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transform: Transform {
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rotation: Quat::from_rotation_y(-90.0 / 180.0 * PI),
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..default()
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},
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..default()
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});
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}
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