pyopengl-users

[PyOpenGL-Users] Missing Quadrilaters in a view-Newbie's question

[projetmbc <pro...@cl...>]

Hello,
this is my first post on this list. I've decided to use OpenGL with 
PyQt. My first test is to draw a cartesian surface using quadrilaters.
My problem is that when I move my scene with the mouse, sometime the 
point of view makes disappear some quadrilaters. I think that is due to 
my lake of knowledge about the definition of the view scene. How can I 
avoid this kind of problem ?

Best regards.
Christophe

PS : I could put herer my python code if it's necessary.

Re: [PyOpenGL-Users] Missing Quadrilaters in a view-Newbie's question

[Mike C. F. <mcf...@vr...>]

projetmbc wrote:
> Hello,
> this is my first post on this list. I've decided to use OpenGL with 
> PyQt. My first test is to draw a cartesian surface using quadrilaters.
> My problem is that when I move my scene with the mouse, sometime the 
> point of view makes disappear some quadrilaters. I think that is due to 
> my lake of knowledge about the definition of the view scene. How can I 
> avoid this kind of problem ?
>   
I'm guessing what you're seeing is the near clipping plane, which would 
"cut" your quadrilaterals if they were to pass it.  You can set the near 
clipping plane to a reasonably small value, but if you "walk through" 
your geometry then the geometry is going to get clipped.

HTH,
Mike

-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
  http://blog.vrplumber.com

Re: [PyOpenGL-Users] Missing Quadrilaters in a view-Newbie's question

[projetmbc <pro...@cl...>]

Mike C. Fletcher a écrit :
> projetmbc wrote:
>> Hello,
>> this is my first post on this list. I've decided to use OpenGL with 
>> PyQt. My first test is to draw a cartesian surface using quadrilaters.
>> My problem is that when I move my scene with the mouse, sometime the 
>> point of view makes disappear some quadrilaters. I think that is due 
>> to my lake of knowledge about the definition of the view scene. How 
>> can I avoid this kind of problem ?
>>   
> I'm guessing what you're seeing is the near clipping plane, which 
> would "cut" your quadrilaterals if they were to pass it.  You can set 
> the near clipping plane to a reasonably small value, but if you "walk 
> through" your geometry then the geometry is going to get clipped.
>
> HTH,
> Mike
>
Thanks, I finally decide to read OpenGL Programming Guide. Then I will 
be back here with "real" problems.  ;-)

Christophe.