Re: [pygame] converting "object position" to "view position" in (py)opengl

[Astan Chee <astan.chee@xxxxxxxxx>]

Because the text being displayed is not static and I can't do it if I do display like this or billboard, right? If I am wrong, how do I do it? I'm using pygame 1.8 on pyopengl.
Thanks again

Forrest Voight wrote:

Why does the cross-section matter?

Just display it at the object's center...

On Wed, Jul 1, 2009 at 1:01 AM, Astan Chee<astan.chee@xxxxxxxxx> wrote:
  

Yes, this is what I'm trying to do but how do I calculate cross-section of
the object at a given distance?
Thanks again

Tyler Laing wrote:

Hmm, I'm not 100% familiar with 3d programming, but wouldn't the best way be
to find the cross-section of the object at some distance from the camera,
which would be a 2d shape, and then you can center the text on that shape?

On Tue, Jun 30, 2009 at 9:26 PM, Astan Chee <astan.chee@xxxxxxxxx> wrote:
    

Hi,
Im relatively new to opengl and I'm not familiat with its jargon but what
I have is objects in a 3D world in various positions and a camera that can
"move" around. What I'm trying to do is if the distance between object and
camera is close enough, display some information on the screen on the
object.
I know how to calculate distance and I know how to print/display text in
opengl (I'm using glOrtho and glRasterPos2i to map out the characters one at
a time).
Anyway, what I'm having problems with is how do I calculate where to
display these information on the screen so that it overlaps the object
(assuming I know the distance and the angle of the camera and the object
relative to the camera). Does this make sense? I've attached an image that I
photoshopped to look like what I'm trying to do.
Thanks for any help
Astan
      

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