Re: Solution for shading - Here we go again, this time multipass r 2004-02-18 - By Peter MacDougall
Back
There are several ways to do it and I'm sure David will tell you his.
What I do is simple: I create my scene as I like it then copy the
original file and begin working on a duplicate.
G-Buffers are great for certain things, but to create tight masks of
single objects I'll turn off all scene lighting, turn up ambient
lighting to 100%, then selectively colour the object I want masked as
pure white, no highlight/shininess/glow/bump/transparency etc.. and all
the other objects as black and a black backdrop. This quickly renders
as a white shape masking out the object. I then do this for each object
I want to separate out in post. Eric has modified the Shader Ops plug
in which makes this step much easier as it makes it possible to add a
single shader to multiple objects at once.
Then I'll render the original scene multiple times, but each time I
turn off all the lights but one so each render shows only the effects
of a single light. I can then recombine these at different intensities
to adjust the brightness of each light in post.
To render out reflections separately, turn up the reflectivity of the
object to 100%, the colour down to black and re-render. You can the use
the object mask you created in the first step to combine this 100%
reflection version of the object with the original render. The original
render could have the object set with no reflectivity allowing you to
speed up the original render depenging on your settings.
Hope that helps. Should write a tutorial on setting up for Post.
On Wed, 18 Feb 2004 01:23:03 -0000, Jerry Russell wrote:
>David,
>I don't have an answer to your question, but your description of multipass
rendering
>caught my attention.
>How do you render shadows, reflections, color, etc. independent of each other?
>This sounds like a good approach for me because I render images for print and
>usually do a fair amount of post in Photoshop.
>
>--- In Carrara@(protected), David Bell <nordwind53@(protected)> wrote:
>>
>> Note: For those who haven't worked with multipass rendering, what you
>> do is take a scene and render it a number of times, once for the color,
>> once for the shadows, once for the reflections, once for the highlights
>> ... then assemble the result as layers in Photoshop or AfterEffects.
>> This allows you to tune the effects and how they interrelate (as well
>> as selective apply filters and the like) This is particularly powerful
>> in animation. I have one animation where I animated a hydrofoil
>> sailboat, then in post production animated in the storm clouds and the
>> waves from still photographs. I was able to do this alone, in a week.
>> If I had animated everything it would have taken much longer.
>>
>> Building on this technique, it is possible to construct your scene in
>> pieces, and pull them all together in post.
>>
>> I hope this brief description is helpful.
Peter MacDougall
pem@(protected)
http://www3.telus.net/pem/index.htm
Reality always exceeds your expectations.
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