Re: Problem with OpenGL calls

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Angus Dorbie (dorbie++at++sgi.com)
Fri, 11 Dec 1998 17:38:05 -0800

Rasterpos is transformed through the modelview and projection
matrices so 0,0,0 may not be where you expect unless you have
controlled the content of those matrices.

Cheers,Angus.

Javier Muņoz Lagaron wrote:
>
> Hello,
>
> We are developing a Performer application.
> In this application, we want to make OpenGL
> calls in the draw process.
>
> But it doesnīt work if I use certain calls as
> glRasterPos2i. I donīt know if I must change
> something in the configuration of pfWindow
> or pfPipeWindow for working with that
> calls.
>
> For example these lines donīt work:
>
> GLint vals[4];
> GLboolean val;
>
> glGetIntegerv(GL_CURRENT_RASTER_POSITION,vals); <-1
> glGetBooleanv(GL_CURRENT_RASTER_POSITION_VALID,&val);
> glRasterPos4i(0,0,0,1);
> glGetIntegerv(GL_CURRENT_RASTER_POSITION,vals); <-2
> glGetBooleanv(GL_CURRENT_RASTER_POSITION_VALID,&val);
> glDrawPixels(nave->ns,nave->nt,GL_RGB,GL_UNSIGNED_BYTE,nave->imagen);
>
> 1 and 2 returns the same values, and the imagen isnīt displayed.
>
> Can anyone give us any clue?
>
> Many thanks
>
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-- 
"Only the mediocre are always at their best." -- Jean Giraudoux 


For advanced 3D graphics Performer + OpenGL based examples and tutors:
http://www.dorbie.com/

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