Thick glass

[Peter Milner]

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?

[Garret Diduck]

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.

[Roy Hirshkowitz]

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.

[Peter Milner]

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.