Re: [Algorithms] Outline Render

[Conor S. <bor...@ya...>]

One thing I've been meaning to try but never got
around to was using fins + a per pixel cut off based
on the normal of the fin. I imagine it would need a
lot of tweaking.

ATI had a demo on their site with a bunch of different
NPR techniques that was pretty good, iirc.

Cheers,
Conor

--- phi...@pl... wrote:

> > Option 1) read the Z buffer (or a float render
> target with depth
> > information) and render black where there are
> gross differences in edge
> > (high-pass filtering).
> 
> This should give you a nice sharp single pixel
> outline, although there are
> a number of different implementations. I'd try
> rendering the object in to
> it's own buffer, with a single flat material, and
> doing the edge filtering
> on that. I guess it depends on whether you want any
> occlusion in your
> outline. I can't remember what GRAW does off the top
> of my head. Either
> way, a straight z-filter could pick up neighbouring
> objects if you're not
> careful.
> 
> > Option 2) Render in two passes, inflate the mesh
> (or move vertices
> > screen-space) in the second pass, rendering the
> mesh with reversed
> > backface culling and all-black triangles
> (cel-shaded outline style).
> 
> This requires work to look good, scaling the outward
> push by depth,
> otherwise your outline varies in width with depth,
> also can give you
> internal outlines, rather than a strict silhouette.
> Fairly easy to
> implement, but hard to make nice. We did this on an
> old project, and I was
> never happy with the aesthetics of the effect.
> 
> Cheers,
> Phil
> 
> 
> 
>
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