Hi,
I have to draw the icon of a light source. The light is in a 3D
space, but
if I draw the icon on a 3D space too, the icon looks smaller when
the light
is far away. So I calculate its 2D point on the screen and I draw it
with
the Ortho projection with the depth test disabled
As an alternative, once you have the screen coordinates for the
corners of your icon you
can use gluUnproject to find world coordinates which will project
there. It's not the most
efficient technique, but it can be optimized if necessary...
It works well. The only
problem is that I have to draw this icon "after" all the objects
have been
drawn, otherwise it gets covered by the objects. Instead I need to
draw it
immediately when I display the light. Is a way to do that e.g.
writing a
high value to the depth buffer?
Can't you supply z-coordinates when you draw the vertices of your
icon? For example, using
something slightly greater than what you specified to be the near
distance in glOrtho().
Cheers,
dave
Best Regards
--
Lorenzo
email: email@hidden
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Mac-opengl mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/mac-opengl/email@hidden
