PathTracer1_4

void main(void) {
      vec3 rayDir = normalize(vPosition - vEyePosition);
      float distanceFromSurface = 0.0;

      for (int i = 0; i < 100; i++) {
          vec3 currentPosition = vPosition + distanceFromSurface * rayDir;
          if (sphereDistance(currentPosition, vec3(0,1,0), 1.0) < 0.){
              gl_FragColor = vec4(rayDir, 1.0);
              return;
          }
          distanceFromSurface += 0.03;
      }
      discard;
}