ShaderChunk: Fixed define collision. See #17442

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

@@ -111,9 +111,9 @@ float linearToRelativeLuminance( const in vec3 color ) {
 
 }
 
-bool isPerspectiveMatrix( mat4 projectionMatrix ) {
+bool isPerspectiveMatrix( mat4 m ) {
 
-  return projectionMatrix[ 2 ][ 3 ] == - 1.0;
+  return m[ 2 ][ 3 ] == - 1.0;
 
 }
 `;