Babylon.js/src/Shaders/ShadersInclude/bonesDeclaration.fx

#if NUM_BONE_INFLUENCERS > 0
	uniform mat4 mBones[BonesPerMesh];

	attribute vec4 matricesIndices;
	attribute vec4 matricesWeights;
	#if NUM_BONE_INFLUENCERS > 4
		attribute vec4 matricesIndicesExtra;
		attribute vec4 matricesWeightsExtra;
	#endif
#endif