Problems with transparency

[Azrael Crusader]

Hy guys,

I'm working since a few days with Indigo in addition to cinema 4d 10. I#Ve made a sample scene with 3 prawns, each one with an own material. One prawn gots a glass material and there is the problem...

After a few minutes rendering the result looks like below.

What am I doing wrong? I've used the search function and found some test scenes trying to find out how I can handle this, but the scenes are for older versions of indigo and the information of the tags in cinema gets lost...

Thanks for your help.

Cheers,

Chris

[Kram1032]

....Inverted Normals...
Definitely.

Check your normals and recalculate them

[Azrael Crusader]

Ahhh...Yes I think it works right now.

Interessting point:

Align the normals --> no change in the result

invert the normals --> working

Thanks a lot for the ultrafast help!

Cheers,

Chris

[Kram1032]

no problem
Just be careful that you don't change those normals, that already are correct^^

Glass gets rendered black, due to three reasons:

- Normalsmoothing problems (affects all materials and is only around edges)
- Inverted Normals (doesn't affect diffuse, diffuse transmitter or phong)
- Mesh without thickness and with IoR 1 (affects all transparent materials with IoR)

[Azrael Crusader]

I love it! I've studied physics especially optics and right now I can use this knowledge directly...Absolut amazing.

[Kram1032]

Wow lol
Yeah, Indigo is physically (optically) highly accurate

[Gengibre]

no problem
Just be careful that you don't change those normals, that already are correct^^

Glass gets rendered black, due to three reasons:

- Normalsmoothing problems (affects all materials and is only around edges)
- Inverted Normals (doesn't affect diffuse, diffuse transmitter or phong)
- Mesh without thickness and with IoR 1 (affects all transparent materials with IoR)

High Gain value is a problem too

[Kram1032]

Not *really*...
You'll still see some colour with hi gain. Some pixels, which aren't black