Re: Solution for shading - Here we go again, this time multipass r 2004-02-18 - By Frank Patnaude
Back
Interesting, I never thought about the amibient, white shader, black
shader idea. This would make a great tutorial.
Frank
--- Peter MacDougall <pem@(protected)> wrote:
> 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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