Re: GIS

New Message Reply Date view Thread view Subject view Author view

Rémi Arnaud (remi++at++intrinsic.com)
Fri, 3 Sep 1999 14:30:00 -0700

> Well it's still not clear to me. You've explained what Performer
> does and the complexity and why it's hard etc. But I've yet to
> glean any understanding of what specific hardware feature must exist
> to accomplish all this. Sorry but saying you can only do it on
> IR is not enough. What "Hardware" is missing from an Octane or an O2
> that prevents clip-mapping. Is it a systems thing or is there some
mystical
> clip-mapping asic?

IR has per pixel computation for texture LOD.
Without that hardware feature the best you can do is per polygon or even
geoset computation.
Everything else can be done with standard openGL.

On the other hand, the software version does not have limitations that the
hardware version has :-)
You can see for yourself if you download the O2 software clipmapping at
www.intrinsic.com , done by Chris Tanner and Michel Jones.

What that demonstration shows is that the same (clipmap included) database
and (performer) software can be used on platforms with or without the
hardware capability.
The performance and quality of the result will not be the same, but that is
a trade-off that can be done by the integrator/user/application developper.

-- Rémi
Intrinsic Graphics

New Message Reply Date view Thread view Subject view Author view

This archive was generated by hypermail 2.0b2 on Fri Sep 03 1999 - 14:30:11 PDT

This message has been cleansed for anti-spam protection. Replace '++at++' in any mail addresses with the '@' symbol.