Planes clipping in three.js

tonifds · March 9, 2019, 7:09am

hello,
is clipping planes computed on GPU ?

Mugen87 · March 9, 2019, 10:31am

The GPU is the only place where an implementation of clipping planes makes sense. Since WebGL does not support clipping planes, three.js provides a custom solution for this. There are several shader chunks that are related to clipping planes. The most important one is:

github.com

mrdoob/three.js/blob/1bb6d19805a30e6edb5650d40ab248a3f9ce918e/src/renderers/shaders/ShaderChunk/clipping_planes_fragment.glsl.js#L2-L30


#if NUM_CLIPPING_PLANES > 0


	vec4 plane;


	#pragma unroll_loop
	for ( int i = 0; i < UNION_CLIPPING_PLANES; i ++ ) {


		plane = clippingPlanes[ i ];
		if ( dot( vViewPosition, plane.xyz ) > plane.w ) discard;


	}


	#if UNION_CLIPPING_PLANES < NUM_CLIPPING_PLANES


		bool clipped = true;


		#pragma unroll_loop
		for ( int i = UNION_CLIPPING_PLANES; i < NUM_CLIPPING_PLANES; i ++ ) {


			plane = clippingPlanes[ i ];

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Planes clipping in three.js

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