radiosity

[cain]

Hi guys, I was wondering if I can't use radiosity if I am using photometric lights? I have gone through the tutorials and radiosity works fine for my

daylights and standard lights, but if I use it on the preset photometric lights

I get a messed up rendering with triangles and dark objects. Also, if I use the daylight system in the scene, my photometric lights don't work.

 

The scene I am rendering is a small lobby with very little windows. If any of you have any suggestions on how to light this scene I would really appreciate it.

[a_w]

Sure, you can use photometric lights with radiosity.

 

The following comes from the Autodesk VIZ 2005 User Reference. It's about Radiosity Workflows:

 

Physically Based Workflow

Lights: Photometric Lights

Daylight: IES Sun and IES Sky

Exposure Control: Any

Units: Make sure your scene is set to the appropriate scale.

 

Non Physically Based Workflow

Lights: Standard Lights

Daylight: Directional Light and Skylight

Exposure Control: Logarithmic − turn on Affect Indirect Only.

Units: Make sure your scene is set to the appropriate scale.

 

 

If you post an image of your scene, it may be easier to diagnose if it's a problem of scale, material, light and/or radiosity settings.

[Tim Saunders]

In my experience photometric lights are about all I use with radiosity. Echoing the words in the previous post, show us a test render so we can see the problem. I'm guessing it is the physical scale in your exposure control perameters causing the problem. As a general rule, when using Log. exp. control (which I reccommend), set the physical scale to the same value as the brightest light in your scene. Then you can adjust the brightness & contrast in your exposure control perams. Radiosity can give some killer results, but it will take some testing, a lot of testing to figure out what adjustments effect what. Stick with it.

[cain]

Thanks for your help guys but I looked over a mental ray tutorial over the week-end and it has worked out quite well for me. I think I will stick with

mental ray from now on.

[jonrempel]

Hi,

Is the tutorial you mentioned something you could share?

Jon