No Texture on backside of glass

[HTKsean]

I'm having a problem texturing glass material. Example: a 1" thick glass table top with all sides smooth except the bottom which has bump texture applied. The glass top renders as though there is no texture at all. Smooth glass all around. However, moving the camera to view the bottom of the glass directly and the texture renders. Move the camera up to view from the top, the texture disappears.
A bug in Corona? or just a setting that I'm missing?

BTW, same result using displacement
Sean

[romullus]

Can you show your material setup? Did you use Corona layered, blend or multi-sub material for the glass?

[HTKsean]

Just using basic Corona material with refraction set to 1.0.
Just noticed that if I check "Thin(no refraction), the texture renders correctly.

Losing the refraction is not very helpful when rendering 1" glass.

Sean

[romullus]

Losing the refraction is not very helpful when rendering 1" glass.

I agree, but why then set refraction to 1.0? This is basically the same as turning off refraction. 1.0 is refraction index of vacuum, 1.5-1.6 is typical refraction index of glass.

[maru]

I would have to see an example render to understand what is going on here.

I agree, but why then set refraction to 1.0? This is basically the same as turning off refraction. 1.0 is refraction index of vacuum, 1.5-1.6 is typical refraction index of glass.

I think he did not mean refraction IOR, just refraction level.