From: Bram Stolk (bram++at++sara.nl)
Date: 02/13/2002 01:17:18
On Tue, 12 Feb 2002 17:54:51 -0800 (PST)
Yair Kurzion <yair++at++polygon.engr.sgi.com> wrote:
> Hello Bram !
>
> From `man pfBillboard':
>
> Intersection traversals test only the pfBillboard's bounding volume, not
> its individual pfGeoSets.
>
> The problem in implementing a full billboard intersection is that you don't
> know the correct billboard orientation (it depends on the viewer position).
I do not even get the bounding volume intersections.
I checked the bounds of my billboards, and the look OK:
pfSphere at (0.000000,0.000000,0.000000), radius 0.173205
Yet, no intersections at all.
I use the PFTRAV_IS_PRIM mode, but I'll try to enable the
PFTRAV_IS_GEODE flag as well, to see if this helps.
If billboard IS_PRIM tests are not possible, you would assume
that billboards will be treated with a gratuitous IS_GEODE test. Maybe
this is not done automatically. I'll check.
Bram
-- ------------------------------------------------------------------------------ Bram Stolk, VR Specialist. SARA Academic Computing Services Amsterdam, PO Box 94613, 1090 GP AMSTERDAM email: bram++at++sara.nl Phone +31-20-5923059 Fax +31-20-6683167"I heard if you play the NT-4.0-CD backwards, you get a satanic message." "Thats nothing, if you play it forward, it installs NT-4.0" ------------------------------------------------------------------------------
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