RE: [Algorithms] VIPM With T&L - what about roam

[Sam K. <sa...@ip...>]

Ok cool, thats what I hoped.

This brings me to another thought...

Say you had a roam implementation that subdivided down (ignoring camera
distance, just using landscape variance) to a fixed level say 500,000
vertices or so and stored them on card for T&L. *then* on subsequent passes
of the roam bintree, generate indexed lists into that hardware vertex pool
based on the camera distance. This means you get true distance based roam
LOD and cached t&l of the used verticies right?

sam


>-----Original Message-----
>From: Cem Cebenoyan <CCe...@nv...>
>To: 'sa...@ip...' <sa...@ip...>
>Date: 06 September 2000 7:47 PM
>Subject: Re: [Algorithms] VIPM With T&L
>
>
>>Hi Sam,
>>
>>a) No, the card doesn't have to TnL the highest res model.  TnL cards do
>TnL
>>"on demand" so that you only pay for the vertices that are indexed.
>>
>>b) All 1000 spaceships can share the same set of vertices, but they must
>>have their own separate index lists, unless you want them to all be at the
>>same LOD at all times.  Again, only the indexed vertices will be
>>transformed, but they will be transformed separately for every instance of
>>the model (unless, of course, there is some vertex cache reuse)
>>
>>Let me know if you have any further questions about VIPM.
>>
>>-Cem
>>NVIDIA Developer Relations
>>
>>-----Original Message-----
>>From: Sam Kuhn [mailto:sa...@ip...]
>>Sent: Wednesday, September 06, 2000 10:49 AM
>>To: gda...@li...
>>Subject: [Algorithms] VIPM With T&L
>>
>>
>>Hi all,
>>
>>This is bound to have been covered a gazillion times before, but I'm
having
>>trouble searching the archives:
>>I'm fairly new to VIPM, and have a couple of questions:
>>
>>a) I've read that its possible to throw the vertices of a model at the 3d
>>card (So T&L is possible)
>>And just maintain the indexed lists into that vertex array using collapses
>>and merges.
>>Doesn't that mean you have to make the card (hardware) transform all of
the
>>vertices in the highest resolution representation of the model each frame?
>>even though the current lod might only need say 100.. or am I missing
>>something?
>>
>>b) Say you wanted 1000 spaceships on screen sharing a single VIPM model,
>how
>>does this work with (a)?
>>Does the card have to transform all the original (high lod) vertices 1000
>>times to screen space?
>>
>>Is it that the hardware T&L only transforms vertices that are pointed to
by
>>the supplied indexed lists? or what
>>
>>Thanks,
>>
>>sam
>>sa...@ip...
>>
>>
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>>GDA...@li...
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>
>