RE: [Algorithms] Return of the front clip plane

[Stephen J B. <sj...@li...>]

On Thu, 3 Aug 2000, Tom Forsyth wrote:

> 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).
 
I think you want to limit the maximum value for Z near too - and doing that
at some reasonable distance (like 3 feet say) should minimise the effect
of walking past a tree.  You could also only pull the range in closer
when the object that's about to be clipped is inside the field-of-view.

At any rate, the need to not clip out the ground you are standing on
limits the maximum Z-near that you can achieve.

Steve Baker                      (817)619-2657 (Vox/Vox-Mail)
L3Com/Link Simulation & Training (817)619-2466 (Fax)
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