Re: [Algorithms] View Frustum Culling

[gl <gl...@nt...>]

As for a DX way of doing it, you can ProcessVertices() your bounding box (as
you suggest), and use GetClipStatus() to get the flags - never tried it
though.
--
gl

----- Original Message -----
From: SHA...@ao...
To: gda...@li...
Sent: Monday, January 22, 2001 3:49 PM
Subject: [Algorithms] View Frustum Culling


Hi,

I've ported most of my 3D engine to DX8 from DX7 and have come to the point
where I am going to cull octree nodes against the viewing frustum.

I was using the ComputeSphereVisibility helper function but we all know this
has been removed :)

I can't quite see how the new Box&Sphere Probe against Ray tests can be used
to achieve what I want, maybe someone could explain?

What would be the easiest ( if not too slow ) way to do this.

If have 2 main plans

1a) Create a sphere around the frustum and do sphere/sphere tests as a
coarse
cull
1b) then do either cone/sphere or 6 frustum planes/sphere tests

2) Possibly put AABB vertices in a VB and check the clip flags after
transformation?

Not even sure if 2 is possible or how to test the clip flags??

Regards,

John.