Merge pull request #18691 from ricardoreiter/bugfix/18675

WebGLClipping: Set numIntersection to 0 in projectPlanes().

src/renderers/webgl/WebGLClipping.js

@@ -153,6 +153,7 @@ function WebGLClipping() {
 		}
 
 		scope.numPlanes = nPlanes;
+		scope.numIntersection = 0;
 
 		return dstArray;