Re: bounding

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From: Angus Dorbie (dorbie++at++sgi.com)
Date: 11/06/2000 02:03:54

Performer has no knowledge of bound boxes above the geoset level.

Fundamentally the bound box is not transformed through DCS or SCS nodes.

The test against the frustum is actually performed using a frustum
transformed to world spaceagainst spheres and axis aligned bound boxes.
This is fast, but transforming a box is more expensive than a sphere so
spheres are used, geoset boxes below transformation nodes are not
tested.

Cheers,Angus.

Markus Som wrote:
>
> hi - maybe an easy problem.
> I want to have a function, which tells me the size (boundingbox) of a
> scenegraph part. ia i have a group with several nodes and i want to know how big
> the whole thing is.
>
> is there any standard solution
>
> thanks in advance
> markus
>
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