Highend3d Artists Discussion Forums

Specular render only?

Tags: #<Tag:0x007f1942deb478>

ton 2001-06-15 03:10:16 UTC #1

Ahh the joys of Maya...has a render pass option but only for Color, Beauty and Shadow ???
what happened to Diffuse or Specular or Ambient only ?
If you are going to copy something from XSI..do it right...
anyways...when you have a scene with over a few million polys...with tons of
textures...and bumps....how can you render out a specular pass
and a separate diffuse pass ? I did have a script that replaces all the color
nodes to a black shader to get only the spec with bump ..
But how about DIFFUSE only ?
any suggs

thanks

arman

Rhinoceros Visual Effects

gmask 2001-06-15 03:25:21 UTC #2

Maya 4 has diffuse and specular render passes..

Until then I guess you could make a script that would modify your shaders in a similair way as how you got a specular pass.

---a note from our sponsor---
Have you tried searching highend3d?

www.gmask.com

jtk77 2001-06-15 03:48:09 UTC #3

I acually need to get the spcularity only off this project or a comp I am building.
I have done it sort of , very much "sort of".
With turning off the visability and doing a slight glow on the material.

.............

ton 2001-06-15 03:54:41 UTC #4

"Maya 4 has diffuse and specular render passes.."

Makes me think what does Maya 4 lack...which will be in Maya 5..
Anybody have any other sugg regarding Just DIffuse rendering ..?

arman

Rhinoceros Visual Effects

jtk77 2001-06-15 04:39:35 UTC #5

YES it can be done in 3 ..sort of , again,
go here and read how

http://www.pixho.com

htp tags are not working for me tonight . So copy and paste it.

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geoffcrowther 2001-06-15 07:30:00 UTC #6

hehehehe jtk.... pixho has the answer to all questions don't he?

maos52 2001-06-15 09:09:58 UTC #7

That french bastard.... I envy him....
Dunno what he's got on his site but I'd say turn all materials transparent so they'll just show their speculars... Wouldn't know how to do that with a script but I think it's possible using the spreadsheet...
Poopsyfloop.

-=<>=-

ton 2001-06-15 15:38:45 UTC #8

Thanks for Emmanuel's method for doing a spec and diffuse pass in Maya..but unfortunately when you have
over a 100 shaders on a 5 million poly model...the method doesnt pass..as you would have to prepare your shaders ahead on to accomodate. We do have a script that replaces all color nodes to a black image for
the spec pass...maybe a simple script that replaces all the blinn to a lambert would work except all the highlight
and reflection connections would be lost.

arman

Rhinoceros Visual Effects

pixho-w 2001-06-15 15:53:44 UTC #9

Hi Arman,

Yes scripting is definitely the way to go.
I'm working on a very useful mel, but if I got some more time, I'll try to do some generic mel that does what you want

Emmanuel

jtk77 2001-06-15 16:30:20 UTC #10

havn;t used it yet.. still waiting to get mine in the mail ..BUT, won;t Maya 4 make this sort of irrelavent? If you can jsut renderSpec passes with a flip of a switch ? or won;t it be that easy.
Ships this month .

.............

ton 2001-06-15 18:32:43 UTC #11

thanks Emmanuel....At least you are trying to find workarounds..while we could just sit back
and blame Maya. Thanks for the effort. Once this project delivers , we intend to put Mel programmers
to create some specific tools that are essential for Maya..i.e Referencing, Poly UV mapping, Texture management,
etc....

arman

Rhinoceros Visual Effects

gmask 2001-06-15 19:02:10 UTC #12

Here's a script that will convert selected shaders to Lambert

//create an array to store the names of the objects you want to modify
string $selection[];
$selection=ls -sl;

//step through the array and perform the modification to each "node" you selected
for ($node in $selection)
{
string $evaltext;
$evaltext="replaceNode (""+$node+"",createNode lambert)";
eval $evaltext ;
delete $node;
}