"fungus" <openglMYSOCKS@[EMAIL PROTECTED]
> wrote in message
news:a1f02041-1b3f-4001-ad66-7887bd3f205d@[EMAIL PROTECTED]
Aug 18, 3:38 pm, Flark <flark...@[EMAIL PROTECTED]
> wrote:
> Hi,
>
> I'm drawing tens of 1000s of triangles and the user is going to
> click on the screen. I want to identify just the one that the
> user has clicked on. I figure select mode would be overkill
> since I'd have to establish tens of 1000s of names, one per
> triangle. Can anyone tell me of an efficient way to do this?
>
If you want efficiency then at the end of the day you're
going to have to do the math on the main CPU. Passing
individual vertices to OpenGL is never going to be as fast
as working with data in main RAM using code which a
compiler can optimize.
Google for "ray-triangle intersection"
--
<\___/>
/ O O \
\_____/ FTB.
Need 3D editing software? Try http://www.topaz3d.com/
That assumes that you *have* the vertex data laying around. Some folks
don't, in which case it gets a lot harder.
And, you don't have to pass individual vertices to OpenGL to pick.
jbw
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