[GEM-dev] frambuffer does change the scene perspective

[Jack]

Le 25 mai 08 à 15:30, marius schebella a écrit :

> cyrille henry wrote:
>> here is a patch that explain this problem.
>
> hi cyrille,
>
> I think you are right, gemframebuffer should not affect the main  
> window.
> Not sure why nobody noticed that before...
> but besides from that, I am not sure, how gemframebuffer should  
> behave,
> if it should adjust to the world perspec or not. since framebuffer is
> ignoring the view, maybe it should also ignore the perspec? (and  
> accept
> individual frustum message instead, and individual view?).
>
> I posted a question about ortho some days ago, and would like to  
> know if
> this is related? (when using ortho in non square windows everything is
> distorted, too).
Just send [compat 0( to [ortho] and all should be fine with a  
rectangle gemwin.
++

Jack
.
>
> marius.
>
>>
>> cyrille
>>
>> cyrille henry a écrit :
>>> hello,
>>> when using a framebuffer in a patch, the perspective of the main
>>> windows is change to (-1, 1) in X and Y.
>>> So it's no more possible to use custom perspective (sending the
>>> perspec message to gemwin is useless).
>>> moreover, the perspective used lead to distorted images when the
>>> gemwin is not square.
>>>
>>> fixing this is quite easy, but will break all patch using frambuffer
>>> with a not square gem windows.
>>> so, i'm wondering if i should commit the fix.
>>>
>>> the fix is mainly to replace line 145 of gemframebuffer.cpp  :
>>> glFrustum(-1,1,-1,1,1,25);
>>>
>>> with :
>>>   float xDivy = (float)GemMan::m_w / (float)GemMan::m_h;
>>>
>>>   glFrustum(GemMan::m_perspect[0] * xDivy, GemMan::m_perspect[1] *
>>> xDivy,    // left, right
>>>             GemMan::m_perspect[2], GemMan::m_perspect[3],
>>> // bottom, top
>>>             GemMan::m_perspect[4], GemMan::m_perspect[5]);
>>> // front, back
>>>
>>> but it need to add #include "Base/GemMan.h"
>>>
>>> and to move  static int       m_w;                  static int
>>> m_h;  from private to public in GemMan.h
>>>
>>> should i commit this?
>>>
>>> cyrille
>>>
>>>
>>> _______________________________________________
>>> GEM-dev mailing list
>>> GEM-dev at iem.at
>>> http://lists.puredata.info/listinfo/gem-dev
>>>
>>>
>>
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