Forum: Carrara

Subject: DIRTY Global Illumination - Where is soft photons?

-Waldo- opened this issue on Apr 24, 2004 ยท 8 posts

-Waldo- posted Sat, 24 April 2004 at 4:32 AM

I want to start a thread to discuss about dirty and clean global illumination. In my opinion GI only worked good for reflector, nothing else. Because the photons that came fron background gives the object skin the dirty light. It is somewhat not honest global illumination. The real global illumination should be soft photons. I had to use bi-gradient to get the soft photons. I only can make two choices for the scene with GI is with Bi-Gradient for soft photons or Texture map for refector. I think it is really silly to have this choice. I need em both.

ewinemiller posted Sat, 24 April 2004 at 11:53 AM

Waldo,

I've had noise problems like that too. In my particular scene turning up the Lighting Quality fixed the problem.

Regards,
Eric Winemiller
Digital Carvers Guild
3D plug-ins for Carrara
http://digitalcarversguild.com

Eric Winemiller
Digital Carvers Guild
Carrara and LightWave plug-ins

-Waldo- posted Sat, 24 April 2004 at 12:01 PM

What light quality did you fix?

Nicholas86 posted Sat, 24 April 2004 at 12:11 PM

Attached Link: http://www.vizualds.com

Eric! You beat me to it!!:) The GI Light quality I think is what he is referring too. I think also increasing the photon count can help fix this. And make sure interpolation is deselected. Also make sure that your texture map is a very high rez image. The attached example isn't the best, but it shows that the settings I used did get rid of the dirty noise you see in yours. Brian brian@vizualds.com http://www.vizualds.com

Nicholas86 posted Sat, 24 April 2004 at 12:13 PM

ps. that is the default GI scene, but I got rid of the fill light, and the walls, its a cloudy orange sky as the background (hence the color) and a grey color to cover the background since the hirez image isn't the best looking thing:)

-Waldo- posted Sat, 24 April 2004 at 1:11 PM

Thank you all for your help. I downslided photon count to 1000 and selected light quality to best. It solved the problem.

ShawnDriscoll posted Sat, 24 April 2004 at 6:38 PM

I normally set lighting quality to BEST instead of GOOD and make sure the model I'm rendering is bigger than 1" in size. If you have 512MB RAM or more, turn on Interpolation and set it to 100% so Carrara isn't recalculating every pixel which slows things way down.

www.youtube.com/user/ShawnDriscollCG

-Waldo- posted Sat, 24 April 2004 at 11:04 PM

Very good tip thank you for sharing with us!