setupShadowFilter( builder, { filterFn, shadowTexture, depthTexture, shadowCoord, shadow } ) {

		return pointShadowFilter( { filterFn, shadowTexture, depthTexture, shadowCoord, shadow } );

	}
Overwrites the default implementation to only use point light specific
shadow filter functions.

@param {NodeBuilder} builder - A reference to the current node builder.
@param {Object} inputs - A configuration object that defines the shadow filtering.
@param {Function} inputs.filterFn - This function defines the filtering type of the shadow map e.g. PCF.
@param {Texture} inputs.shadowTexture - A reference to the shadow map's texture.
@param {DepthTexture} inputs.depthTexture - A reference to the shadow map's texture data.
@param {Node<vec3>} inputs.shadowCoord - Shadow coordinates which are used to sample from the shadow map.
@param {LightShadow} inputs.shadow - The light shadow.
@return {Node<float>} The result node of the shadow filtering.