[wahn]

Hi,

maybe someone asked this question already but I can't find what's going wrong

I try to render colored glass and I saw images on this forum so I assume it's possible but I can't make it work. Maybe a Maya problem?

I try to render an image like this:



That was done with Radiance. Here is my first Maxwell test with "Custom" presets, "ND" 1.52, and "Abbe" 160:



No color? Where is it? Each part in the Radiance image got a different dielectric material with a different color. I tried the "crown" preset:



No success

What am I doing wrong? Help, please ...

Cheers,

Jan

[iker]

Colored dielectrics works well, can you explain how are you trying to do it wahn?

[tom]

solid color for one body is working but you cannot use mapped color for dielectrics yet.
so, you may set them as seperate objects...

[wahn]

Well, I try to use the solid color but from within Maya. Maybe that's the problem:



Or does the geometry have to be a solid? I just use a simple rectangle shape instead of a box. Each stripe with a different color was modelled as a separate plane with a separate dielectric material:



What else can go wrong? Maybe some render globals I have to activate?

Thanks,

Jan

[tom]

everything must have a volume, there's no plane in real life so in maxwell you know.
model your sections 3D not 2D (give them thickness)

btw/ set abbe 150 and uv=0 for a clear glass as in your radiance example

[wahn]

Thank you very much Tom. Seems to work now

[wahn]

[tom]

first question: how many bounces?

[wahn]

# of bounces: 16

[tom]

hmm strange... but this was not the result what i was waiting for...

[wahn]

Hi,

I changed the perspective a bit, added other elements to the scene, and more light emitting geometry. The reflections start to look alright (after 11 hours) but I'm not sure about the transparency. Will the glass "clear" (get more transparent) if I add more time to the render? I guess the reflections will have less noise but what about the colored shadows? Which caustics settings should I use?



Cheers,

Jan

[wahn]

Hi,

I start to get some colored shadows on the wall



Cheers,

Jan

[wahn]

Hi,

I played around a bit with mental ray and the same tapestry (made of dielectric material) to throw photons at it and see what pattern I would get on the wall. I removed the rest of the scene but the pattern on the wall looks much more interesting as with Maxwell. I'm wondering what's more appropriate and maybe someone like Tom could create a similar test?

Here is the tapestry from the front (rendered with mental ray):



The caustics are created by 4 spotlights. They are at the same position as in the Maxwell images. Three in the back (in the same row) and one in front. Here is another view where you can see the light positions:



Maybe there are too many other lights in the Maxwell scene to show that kind of effect. Can someone create a scene for Maxwell which show a similar pattern on the back wall? Or is the result I get with mental ray wrong?

Cheers,

Jan