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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