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skinning.wgsl
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skinning.wgsl
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// If using this WGSL snippet as an #import, a dedicated
// "joint_matricies" uniform of type SkinnedMesh must be added in the
// main shader.
#define_import_path bevy_pbr::skinning
fn skin_model(
indexes: vec4<u32>,
weights: vec4<f32>,
) -> mat4x4<f32> {
return weights.x * joint_matrices.data[indexes.x]
+ weights.y * joint_matrices.data[indexes.y]
+ weights.z * joint_matrices.data[indexes.z]
+ weights.w * joint_matrices.data[indexes.w];
}
fn inverse_transpose_3x3(in: mat3x3<f32>) -> mat3x3<f32> {
let x = cross(in[1], in[2]);
let y = cross(in[2], in[0]);
let z = cross(in[0], in[1]);
let det = dot(in[2], z);
return mat3x3<f32>(
x / det,
y / det,
z / det
);
}
fn skin_normals(
model: mat4x4<f32>,
normal: vec3<f32>,
) -> vec3<f32> {
return normalize(
inverse_transpose_3x3(
mat3x3<f32>(
model[0].xyz,
model[1].xyz,
model[2].xyz
)
) * normal
);
}