getMatrixAt( instanceId, matrix ) {

		this.validateInstanceId( instanceId );
		return matrix.fromArray( this._matricesTexture.image.data, instanceId * 16 );

	}
Returns the local transformation matrix of the defined instance.

@param {number} instanceId - The ID of an instance to get the matrix of.
@param {Matrix4} matrix - The target object that is used to store the method's result.
@return {Matrix4} The instance's local transformation matrix.