Re: [PyOpenGL-Users] Orthographic zoom

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

Prashant Saxena wrote:
> Hi,
>
> How to implement 'zoom' when designing an orthographic view base 
> application. I would prefer if there is a way where we can move camera 
> in/out on screen axis to perform zoom. It's similar to commercial 3D 
> application like Maya or 3ds max where you an move the orthographic 
> camera.
>
> I have tried using 'glScale' but it doesn't meet my requirements. 
> 'glOrtho' doesn't support camera position. Do I have to go for 
> 'glPerspective' ?
Haven't done much ortho work, but the theory is this:

glScale( )
glTranslate( )

With the negative position of the camera before you start drawing your 
scene.  The glPerspective/glOrtho stuff is configuring the internals of 
your camera.  The model-view matrix is where you should configure your 
viewing-position.

HTH,
Mike

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