Re: [plib-users] Hidden Line Removal

[Devrim E. <de...@in...>]

> Pass 1: Render all the geometry in completely transparent polygons
>         ...make sure you have glAlphaFunc set so that the DO actually
>         render.  As an alternative, you could draw the scene with it's
>         'normal' alpha values - but tell GL to mask off the colour planes.
>
> Pass 2: Use glPolygonOffset to move everything a tad closer to the eye
>         and then re-render the geometry in wireframe mode.

If I was doing pure opengl I would draw two passes sequentially. But while
using a scene graph where shall I do the first and the second pass ?
 I am planning to draw 1st pass in a predraw and set the state for the second
pass at the end of the predraw func. This way draw function will automatically
do the second pass. I wonder how do PLIB'ers do multipass rendering normally.

>
>
> The first pass sets the Z buffer as if it had been drawn normally - the
> second pass does the actual rendering of the wires - which will be occluded
> by the polygons in the first pass.
>
> > BTW, the list is now at:
> > pli...@li...
> > While you are writing to woodsoup. Is the woodsoup-list still open?
>
> Well, I've had no success in getting the Woodsoup maintainer to shut
> them down...so probably they are still running.  However it's unlikely
> anyone could find them because the Woodsoup website just redirects you
> to our usual Slashdot location.  I suppose some older Linux CD's still
> tell you to send queries to Woodsoup - it's hard to do anything about
> that.  I suppose that's a good reason to let the Woodsoup mailing lists
> live - we can at least tell people where they *SHOULD* be subscribed.
>
>
> --
> Steve Baker   HomeEmail: <sjb...@ai...>
>               WorkEmail: <sj...@li...>
>               HomePage : http://web2.airmail.net/sjbaker1
>               Projects : http://plib.sourceforge.net
>                          http://tuxaqfh.sourceforge.net
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>                          http://prettypoly.sourceforge.net
>
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M. Devrim Erdem            de...@in...
Software Engineering

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