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Radiosity woes
show user profile  mr_pablo
I have started playing with using radiosity to simulate an enclosed room with a light source (or a couple) in which I can place objects and hopefully get realistic looking renders.

However, I am really struggling with getting it to play ball. Sometimes the empty room will look ok-ish, but when I place an object inside it, the textures on the object are very bright.

e.g. the walls of the room are pure white, and a bark brown "wooden" object is in the room. When rendered, the walls are quite dark, and the object appears to be very light brown.

I am using the logarithmic exposure control with default settings.

Can anyone help with setting up radiosity for good lighting? thanks!

below is an example of the problem. walls are set to be pure white, and the object on the podium should be quite dark brown, yet is super bright!

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Software Developer / Photographer
read 693 times
4/17/2008 9:45:13 AM (last edit: 4/17/2008 9:52:53 AM)
show user profile  mr_pablo
tiny bump =D



Software Developer / Photographer
read 651 times
4/18/2008 4:10:39 AM (last edit: 4/18/2008 4:10:39 AM)
show user profile  Westcoast13
Ever considered using Mental Ray?


My Turbosquid Area

read 644 times
4/18/2008 4:35:31 AM (last edit: 4/18/2008 4:35:31 AM)
show user profile  mr_pablo
Not a very constructive answer there...

I would love to use MR, but the fact is my work only has 3D Studio Max v5.

Even if i was using Max 2008, I would still like a solution to my radiosity problems.



Software Developer / Photographer
read 640 times
4/18/2008 4:54:16 AM (last edit: 4/18/2008 4:54:16 AM)
show user profile  TimTamFin
Have you modeled everything into scale ? System units should be inches and viewport units relative to the size of the object you're modeling. Most of the time if FG, GI or Radiosity fails - it's due to incorrect scale.
Rgds,
Timo

read 633 times
4/18/2008 5:00:58 AM (last edit: 4/18/2008 5:00:58 AM)
show user profile  mr_pablo
I always use millimetres as i mostly model small products. the room is about 3metres square (3000mm)

So yes, everything is to scale.

Although, I'm sure if my scale was somehow off, it wouldn't explain the pure white walls being dark and the dark brown wood being super bright, it just doesn't make sense.



Software Developer / Photographer
read 629 times
4/18/2008 5:13:43 AM (last edit: 4/18/2008 5:13:43 AM)
show user profile  Westcoast13
>"Not a very constructive answer there..."

Alright mate, just wondering. Jeez.


My Turbosquid Area

read 622 times
4/18/2008 5:31:30 AM (last edit: 4/18/2008 5:31:30 AM)
show user profile  TimTamFin
I made a simple test similar to yours. With almost default settings in Radiosity. I used automatic exposure control.

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Rgds,
Timo

read 620 times
4/18/2008 5:36:47 AM (last edit: 4/18/2008 5:36:47 AM)
show user profile  mr_pablo
TTF - not long after my last post, I tried changing the Exposure control to automatic (great minds think alike) and yes, it works!

I'm pretty sure though I have seen tutorials that use the logarithmic control and somehow produce nice results.

I wonder whats going on =S



Software Developer / Photographer
read 599 times
4/18/2008 9:27:15 AM (last edit: 4/18/2008 9:27:15 AM)
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