AccuRender nXt

advanced rendering for AutoCAD

Thick toughened glass always displays a dark green edge even when the glass is clear.

The only way, I've found, to simulate this in nXt is to add a green glass edge to the model.

Are there settings within the material transparency properties to do this properly rather than faking it?

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I run into this as well. Typically I'll add a touch of Red & Blue to the glass material to simulate the tempered/toughened color. It does add a bit of color to the glass, but it seems pretty natural to the eye.

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I don't know if we've got enough horsepower right now to simulate this physically-- the green in the edge of most modern float glass is due to two factors-- (1) there is a slight green tint to the glass (iron impurities, I believe) and (2) the edge of the glass is exhibiting a lot of total internal reflection and therefore subsurface attenuation or scattering, which darkens the green tint significantly.

I'll give it a try this weekend if I have a chance-- but I would start with a slight green color similar to what Garret suggests.  Sub-surface attenuation may be required (this will work better with the hybrid engine).  Just a guess, anyway.  What we certainly do not handle right now is spectral shifts due to scattering. Something for the future.

If it can be achieved, it would be useful to have it as an option either on the material or on the object. Only to be used when absolutely necessary.

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