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Disappearing black reflection on mantra metal


chang

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Hi guys.

The image below is clay materials on standard mantra metal with (reflect: 0.3 diffuse:0.2)

You can see the disappearing black reflection.

I understand it's quite natural since the calculation would be,

( diffuse value : above zero ) + ( reflective, raytrace or trace value : zero )

I wanna build my own reflective shader to resolve this additive process.

Any suggestion? or clue?

Thanks in advance. & Happy new year. :)

post-175-126244334983_thumb.jpg

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If you put a big white environment sphere, I think you'd see the black sphere show up (due to occlusion of the background).

Since you have a black background (i.e. nothing picked up in missed rays), the black sphere is blending perfectly with the background.

Does that make sense?

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