Merge pull request #14617 from mrdoob/revert-14602-fog-fix

Revert "Distanced based fog"

src/renderers/shaders/ShaderChunk/fog_vertex.glsl

@@ -1,4 +1,4 @@
 
 #ifdef USE_FOG
-fogDepth = length(mvPosition);
+fogDepth = -mvPosition.z;
 #endif