Re: [Plib-users] sgFrustum setting to the same as opengl

[Oliver B. <sh...@ih...>]

view.cpp:42: no matching function for call to `sgFrustum::getMat4 ()'
all the other sg functions work fine so  ?

On Wed, 10 May 2000, you wrote:
> Oliver Batchelor wrote:
> > 
> > I have a function for setting up a view frustum  I want to know if
> > its getting the right values to be setup the same as the opengl one
> > ...
> > I am getting some wierd results in my landscape renderer -
> > If I roll around etc everything dissapears  but I cant see whats
> > going wrong ...
> > 
> > here is the setup code ...
> > 
> > void View::Set(float angle, float near, float far) {
> >     glMatrixMode(GL_PROJECTION);
> >     glLoadIdentity();                           // Reset The Projection Matrix
> > 
> >     gluPerspective(angle, 640.0/480.0, near, far);      // Calculate The Aspect Ratio Of The Window
> >     glMatrixMode(GL_MODELVIEW);
> > 
> >     frustum.setFOV(angle, angle) ;
>                      ^^^^^^^^^^^^
>                That's going to set the HFOV and VFOV to the
>                same values - but you (seem to) have a 640x480
>                window.  Try using  (angle,-1) - and we'll compute
>                the second angle for you assuming a 3:4 aspect
>                ratio.
> 
> Dunno if that's enough to account for your wierdness.
> 
> You could also use a sgFrustum::getMat4 to grab the matrix out
> of the sgFrustum - then you can use glLoadMatrix to put it
> onto the projection stack - no messing with gluPerspective - and
> it guarantees a good match.
> 
> -- 
> Steve Baker                  http://web2.airmail.net/sjbaker1
> sjb...@ai... (home)  http://www.woodsoup.org/~sbaker
> sj...@ht...      (work)
> 
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