Photon problem in mtor

Become a member of the CGSociety

Connect, Share, and Learn with our Large Growing CG Art Community. It's Free!

Thread Tools Display Modes
  04 April 2005
Photon problem in mtor

i'm using rat6 on maya5, i just finished textureing my set, i kept a spot light and switched on emit photons, i checked the rays in globals also, but it dosen't emit photons, there's no bounce at all. 1. why i'm not getting photons( render looks the same as emit photons of )?
2. is there any other way i can light my set with one light with bounce etc. ?
  04 April 2005
You need to have an ensemble on yuor surface with the surface type set. There are only a few presets to choose from. To be honest photons in prman are rubbish - save your time and ue Mental Ray if you can - it is a lot better in this case.

  04 April 2005
Thank u

Thank u very much Simon....i've planned to go to mental ray after trying my stint in this. i read about the ensemble thing, but if i want light bounces all over the scene should i have ensemble on all the surfaces? that would make me change shaders for most of the objects, but isn't there any other way? what about indirect illumination?
  04 April 2005
Simon's right. Don't ever use photons in prman.

For indirect illumination you can use the IndirectLight. But it's not quick.

You can have your characters photoreal, fast or cheap. Pick two.
  04 April 2005
"it" can display photon maps.
You can use that for debugging your scene.

  04 April 2005
thank u guys

now i'm using indirect light and it is slow as u said. but without ensemble for the object can't we map a photon node to light to get bounce( i just want to try out all the options i don't care if it's slow)
  04 April 2005
You may be able to light link the indirect light if you don't mind some inacuracy. The real problem with photon maps in prman is that surfaces either reflect or collect photons - there is nowhere inbetween. And you have absolutely no shader control over it. In the RenderMan globals Rays > Photon Map settings you can set an overall shader for all surfaces, but it's not very useful unless you have a combination of reflective and diffuse photon surfaces.

Also the way photon maps are generated is just weird. There should be just a photon map display driver, but instead you have to use a null display driver and use an attribute to set the output path.

  04 April 2005
Thank u ver much simon..that was quiet an indepth explanation on photons.
  04 April 2005
Thread automatically closed

This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.
CGTalk Policy/Legalities
Note that as CGTalk Members, you agree to the terms and conditions of using this website.
Thread Closed share thread

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Society of Digital Artists

Powered by vBulletin
Copyright 2000 - 2006,
Jelsoft Enterprises Ltd.
Minimize Ads
Forum Jump

All times are GMT. The time now is 07:44 AM.

Powered by vBulletin
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.