Re: [Plib-users] setTransform scaling problem

[Steve B. <st...@sj...>]

PLIB doesn't really support realtime scaling.  It makes things like
field of view culling & collision detection hideously expensive &
complicated and it means that you can't use the same matrix for
transforming vertices and normals without renormalising - which is also
very bad.

You should rescale the vertex array yourself and not do it in the transform.

  -- Steve


ha...@th... wrote:
> Hello
> 
> I want to scale the tux from the tuxexample demo. (plib-examples-1.8.5)
> I change the setTransform function to scale the tux.
> The tux is not correct drawing. I tink the recalculating of the  
> bounding box for viewing have a bug.
> I am using linux and plib 1.8.5
> (i have the same problem in my own project)
> 
> static void update_motion ()
> {
>    static int frameno = 0 ;
> 
>    frameno++ ;
> 
>    sgCoord campos ;
>    sgCoord tuxpos ;
> 
>    /*
>      Spin Tux, make the camera pan sinusoidally left and right
>    */
> 
>    sgSetCoord ( & campos, 0.0f, -5.0f, 1.0f, 24.0f *  
> (float)sin(frameno/100.0), 0.0f, 0.0f ) ;
>    sgSetCoord ( & tuxpos, 0.0f,  0.0f, 0.0f, 0.0f, 0.0f, frameno/100.0f ) ;
> 
>    ssgSetCamera ( & campos ) ;
> //  penguin -> setTransform ( & tuxpos ) ; // from
>    penguin -> setTransform ( & tuxpos ,10.0f,10.0f,10.0f) ;  // to
> }
> 
> 
> thank you
> 
> Harald Pichler
> 
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