node_modules/three/src/renderers/shaders/ShaderChunk/skinning_vertex.glsl.js

export default /* glsl */`
#ifdef USE_SKINNING

	vec4 skinVertex = bindMatrix * vec4( transformed, 1.0 );

	vec4 skinned = vec4( 0.0 );
	skinned += boneMatX * skinVertex * skinWeight.x;
	skinned += boneMatY * skinVertex * skinWeight.y;
	skinned += boneMatZ * skinVertex * skinWeight.z;
	skinned += boneMatW * skinVertex * skinWeight.w;

	transformed = ( bindMatrixInverse * skinned ).xyz;

#endif
`;