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Old 04-30-2003, 07:48 AM   #1
Nicool
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Question simple radisity render setup

Hye,
I've tried to get a simple radiosity render with mentalRay (maya4), and can't get something correct. First case all is burn, second case it's only the light which bright the scene. I' know the tutorial which exist, and I've already redenr demo scene on my computer well.

So can you give in ~five point (ray, ray sample, ray%%) the typical setup of the light ant of the MR render globals.
It's for my head project http://www.cgtalk.com/showthread.php?s=&threadid=59252
 
Old 04-30-2003, 12:58 PM   #2
wgreenlee1
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Well...
What I did when I first got Maya ws this for a simple GI render...ala radiosity is this...
Just turn out the lights...
In the camera options select the background color and put it about half way....mid grayish
Then in your globals leave globals at default but make sure Final Gathering is turned on,nothing else...no caustics,nothing.
Render.
This pic here was just that...raytracing was at production as was anti-aliasing.
This is just some quick stuff I made...
Just the bare bones of GI with no big jump in settings...
I dont know if this what youre after but this is what Ive been doing a little of....
In the next post I show a little caustics...fast caustics...
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File Type: jpg gi.jpg (15.2 KB, 340 views)
 
Old 04-30-2003, 01:00 PM   #3
wgreenlee1
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This time I think I turned the light up just a little....
You see the back drop is doing most of the lighting....
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Old 05-01-2003, 12:01 PM   #4
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Thanks a lot man. I was not knowing about hte camera color
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Old 05-01-2003, 11:22 PM   #5
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Hey wgreenlee1 -

Thanks for the post on GI & FG. I did what you described, & i get a nice looking pic (albiet your green vertical torus'), however, i can't seem to get any shadows on the plane w/ GI.
When i turn FG, i get shadows, but the image is blown out.

any suggestions?

thanks again
 
Old 05-01-2003, 11:26 PM   #6
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oh, and i don't have any lights in the scene. I did add a spot & turned it off as per your post, but the scene was black.

thanks
 
Old 05-03-2003, 05:55 PM   #7
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don't forget the cam color !!
 
Old 05-03-2003, 09:24 PM   #8
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What difference would that make? The camera background color is not affected by lighting. I think he means he has light sources that, when turned all the way off, make the scene completely dark. What I was told was to make a half-sphere to place around your scene, make it some gray shade, and turn up the incandescence. Make sure Final Gathering is turned on in the mentalray globals, and see what that gives you. (You do not "need" light sources for this, but I am not sure what to do when you DO need light sources, because no one will answer my thread. :thumbsdow )
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Old 05-04-2003, 12:34 AM   #9
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Heres one lit by a image plane only
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Old 05-04-2003, 12:35 AM   #10
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Here is one with a HDR image mapped onto a sphere
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Old 05-04-2003, 12:37 AM   #11
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Here is another HDR with a little DOF.....
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Old 05-04-2003, 12:51 AM   #12
Nicool
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Eh TiKiMon, the camera color as an influence on the final gather render. But for your question about the case of an added light... I don't know
 
Old 05-04-2003, 01:58 AM   #13
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Quote:
But for your question about the case of an added light... I don't know


What's was the exact question ?

Why he put a light in the scene with 0 intensity ? Most probably to avoid the creation of the default light (which can be disabled in the render globals too).
 
Old 05-04-2003, 03:47 AM   #14
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Quote:
Originally posted by stunndman
What's was the exact question ?

Why he put a light in the scene with 0 intensity ? Most probably to avoid the creation of the default light (which can be disabled in the render globals too).


Oh..crap...
Well to tell the truth.....I keep forgeting about the default light ..... :insane:
 
Old 05-04-2003, 10:18 AM   #15
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Quote:
Originally posted by Nicool
Eh TiKiMon, the camera color as an influence on the final gather render. But for your question about the case of an added light... I don't know


Thanks Nicool... I never would have imagined that the bg color of the camera would in any way effect the scene lighting. I just thought it was there for placing in areas where there was no object in the view.

So do you ever use any actual lights with intensities greater than 0? I know that doing that would cast comparably harder shadows... but right now, I suppose I am still a bit confused on using lights to light a nice GI scene, rather than incandescent objects.
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