Debug winding validator

Questions
8

The simplest option of such material:

var mat = new THREE.MeshBasicMaterial({side: THREE.DoubleSide});
mat.onBeforeCompile = shader => {
  shader.fragmentShader = shader.fragmentShader.replace(
    `#include <fog_fragment>`,
    `#include <fog_fragment>
gl_FragColor.rgb = gl_FrontFacing ? vec3(0,1,0) : vec3(1, 0, 0);
`
  );
}
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