RE: [Algorithms] Return of the front clip plane

[Feltman, H. <Fe...@se...>]

So how does this sound:

- Create a frustum which matches your graphics API's frustum
with the exception of the near plane; for this, use the minimum
near plane you can handle.

- Clip world geometry (or a bounding version) to this frustum
manually just like the good old days.

- Use the closest clipped point of "whatever is left after clipping"
to the eye plane as the distance for the near plane for a new
frustum, send this frustum to the graphics API, and draw the
world geometry for this frame.

I'm sure it would work; is this the way you did it?

Hamilton Feltman
SEGA AMUS/ARCADE
www.sega.com/alienfront

> -----Original Message-----
> From:	Tom Forsyth [SMTP:to...@mu...]
> Sent:	Thursday, August 03, 2000 12:46 PM
> To:	gda...@li...
> Subject:	RE: [Algorithms] Return of the front clip plane
> 
> Moving the near (and possibly far - depends on your app) clip planes
> dynamically works very well indeed. Yes, there is the slight artifact that
> walking past a tree affects the Z precision of the far-off building that
> you're actually looking at, but then it's pretty hard to think of any
> system
> that will do it any better, apart from the Z-partition trick (which is
> expensive in some cases - though dead easy for flight sims).
> 
> Tom Forsyth - Muckyfoot bloke.
> Whizzing and pasting and pooting through the day.
> 
> > -----Original Message-----
> > From: Steve Wood [mailto:Ste...@im...]
> > Sent: 03 August 2000 20:09
> > To: 'gda...@li...'
> > Subject: RE: [Algorithms] Return of the front clip plane
> > 
> > 
> > > -----Original Message-----
> > > From: Jason Zisk [mailto:zi...@n-...]
> > > 
> > > Another solution is to just make your player's bounding 
> > > volume larger so you can't get close enough to stuff to
> > > clip into it, this works okay but I find that you have 
> > > to keep the player from getting closer than 3 units with 
> > > a 1 unit clip because of viewport rotation (just keeping the 
> > > player 1 unit away is fine if you are staring straight at a 
> > > wall but as soon as you rotate the edges of your viewport 
> > > will clip it).
> > > 
> > 
> > For my FPS I used a wall that I walked up to then looked up 
> > and down, then
> > adjusted my collision detection to prevent the player's view 
> > from clipping
> > the wall simply because of the view angle.  It seems to work fine...I
> > wouldn't want to get into changing the viewport dimensions 
> > cause wouldn't it
> > distort the scene?  I'd reserve changing viewport dimensions 
> > for special
> > effects like underwater wooziness.
> > 
> > R&R
> > 
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> > 
> 
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