Merge pull request #18891 from WestLangley/dev_clipping

Shaders: assign the clipping shader chunk its own varying

src/renderers/shaders/ShaderChunk/clipping_planes_fragment.glsl.js

@@ -7,7 +7,7 @@ export default /* glsl */`
 	for ( int i = 0; i < UNION_CLIPPING_PLANES; i ++ ) {
 
 		plane = clippingPlanes[ i ];
-		if ( dot( vViewPosition, plane.xyz ) > plane.w ) discard;
+		if ( dot( vClipPosition, plane.xyz ) > plane.w ) discard;
 
 	}
 	#pragma unroll_loop_end
@@ -20,7 +20,7 @@ export default /* glsl */`
 		for ( int i = UNION_CLIPPING_PLANES; i < NUM_CLIPPING_PLANES; i ++ ) {
 
 			plane = clippingPlanes[ i ];
-			clipped = ( dot( vViewPosition, plane.xyz ) > plane.w ) && clipped;
+			clipped = ( dot( vClipPosition, plane.xyz ) > plane.w ) && clipped;
 
 		}
 		#pragma unroll_loop_end

src/renderers/shaders/ShaderChunk/clipping_planes_pars_fragment.glsl.js

@@ -1,9 +1,7 @@
 export default /* glsl */`
 #if NUM_CLIPPING_PLANES > 0
 
-	#if ! defined( STANDARD ) && ! defined( PHONG ) && ! defined( MATCAP ) && ! defined( TOON )
-		varying vec3 vViewPosition;
-	#endif
+	varying vec3 vClipPosition;
 
 	uniform vec4 clippingPlanes[ NUM_CLIPPING_PLANES ];
 

src/renderers/shaders/ShaderChunk/clipping_planes_pars_vertex.glsl.js

@@ -1,5 +1,7 @@
 export default /* glsl */`
-#if NUM_CLIPPING_PLANES > 0 && ! defined( STANDARD ) && ! defined( PHONG ) && ! defined( MATCAP ) && ! defined( TOON )
-	varying vec3 vViewPosition;
+#if NUM_CLIPPING_PLANES > 0
+
+	varying vec3 vClipPosition;
+
 #endif
 `;

src/renderers/shaders/ShaderChunk/clipping_planes_vertex.glsl.js

@@ -1,5 +1,7 @@
 export default /* glsl */`
-#if NUM_CLIPPING_PLANES > 0 && ! defined( STANDARD ) && ! defined( PHONG ) && ! defined( MATCAP ) && ! defined( TOON )
-	vViewPosition = - mvPosition.xyz;
+#if NUM_CLIPPING_PLANES > 0
+
+	vClipPosition = - mvPosition.xyz;
+
 #endif
 `;