Those are secondary rays, which are separate from the primary rays from a camera. Secondary rays from reflective or transmissive effects are not considered visi

Those are secondary rays, which are separate from the primary rays from a camera. Secondary rays from reflective or transmissive effects are not considered visibility from the camera. This distinction was very important in hybrid renderers that combined rasterization from the camera with ray tracing for secondary rays, like PRman and mental ray. Now we have the same patterns being repeated in real time rendering. This was explained to you already. You could learn something if you didn't think you knew everything already.