Re: [PyOpenGL-Users] Depth problem

[George P. <gp...@ti...>]

Prashant,

glClearDepth() doesn't do what you think it does.

Prashant Saxena wrote:
> I am creating a 2D application using pyOpenGL. Here is the init function:
>     glClearColor(0.5, 0.5, 0.5, 0.0)

This means, "when you clear the color buffer, make it all gray".

>     glClearDepth(1.0)
> # Enables Clearing Of The Depth  Buffer

No.  This means, "when you clear the depth buffer, make it
all 1.0".

>     Everything I am drawing with 'z' less the  1.0 is visible.

Because its z is less than the z value already in the depth
buffer (1.0).

> If I am 
> drawing something where 'z' is greater then 1.0 it's not visible. 

Because its z is greater than the z value already in the depth
buffer (1.0), so why bother drawing it?

Call glClearDepth() with a more reasonable value (i.e. one
that's greater than the depth you'll be drawing anything at)
and you should be fine.


--George Paci  <gp...@ti...>

   Most software wakes up each day with a fresh case of amnesia.
   Unfortunately, software that doesn't learn from history dooms users
   to repeat it.    --Bret Victor