Re: Problem with shadow render opengl

[Daniele C. <dca...@in...>]

I tried to set stencil bits at 0,8,32 value.
If I create a  drawcontext from video:

TQ3Win32DCDrawContextData myWin32DrawContextData;
CClientDC DC(theWindow);
HDC hwin= (HDC) DC;
myWin32DrawContextData.hdc = hwin; 
myDrawContext=Q3Win32DCDrawContext_New(&myWin32DrawContextData) ;
Shadows are nicely visible.
It is not necessary set stencil bits.
So I think it is not a problem caused from videocard.

I tried some windows machine but without changing.
Actually I can't  try walking through gldrawcontext_fbo_new in a 
debugger because My project is in Visual studio 6.0 and quesa is in  
V.S. 2005


James W. Walker ha scritto:
> On Sep 14, 2007, at 2:08 AM, Daniele Cavallini wrote:
>
>   
>> Thank's a lot. I used your precious hints and now my app don't crash.
>> I created drawContextDisplay from window device context and I used it
>> like masterDrawContext.
>> Unluckily the shadows is not still visibles.
>> Also I tried to require explicity the stencil buffer using
>> kQ3DrawContextPropertyGLStencilBufferDepth
>> TQ3Uns32 preferredStencilBits = 0;
>>     
>
> Why 0?  You need stencil bits.  The usual value is 8.
>
>   
>> Q3Object_SetProperty(drawContextDisplay,
>> kQ3DrawContextPropertyGLStencilBufferDepth,sizeof 
>> (preferredStencilBits),
>> &preferredStencilBits );
>> Q3Object_SetProperty(myDrawContext,
>> kQ3DrawContextPropertyGLStencilBufferDepth,sizeof 
>> (preferredStencilBits),
>> &preferredStencilBits );
>> But nothing.
>> Do you think I must give up to have images with high resolution with
>> shadows using Perspective and axonometric in windows?
>>     
>
> No.  I certainly expect to make offscreen images with shadows in a  
> future Windows version of my product, though I think it has not been  
> tested yet.
>
> Have you tried more than one Windows machine?
>
> Have you checked the capabilities of the video card with GLView?  
> <http://www.realtech-vr.com/glview/>  For instance check for  
> GL_EXT_framebuffer_object.
>
> Have you tried walking through gldrawcontext_fbo_new in a debugger?
>
>
>   
>> With Rayshade I obtain good images but only in Perspective view.
>>
>> James W. Walker ha scritto:
>>     
>>> On Sep 13, 2007, at 3:42 AM, Daniele Cavallini wrote:
>>>
>>>
>>>       
>>>> I try so:
>>>> drawContextDisplay is a TQ3DrawContextObject global variable
>>>>
>>>>         TQ3AcceleratedOffscreenPropertyData propData;
>>>>         myStatus = Q3View_GetDrawContext
>>>> (gDocumento3D.fView,&drawContextDisplay); // I get the drawcontext
>>>> display
>>>>         myDrawContext = MyNewDrawContext(lar,alt);// I create the
>>>> Pixmap
>>>> drawcontext (TQ3PixmapDrawContextData)
>>>>         propData.masterDrawContext=drawContextDisplay;
>>>>         propData.copyFromPixmapAtFrameStart=kQ3False;
>>>>         propData.copyToPixmapAtFrameEnd=kQ3False;
>>>>
>>>>         myStatus =    Q3Object_SetProperty(myDrawContext,
>>>> kQ3DrawContextPropertyAcceleratedOffscreen,sizeof(propData),
>>>> &propData );
>>>>         myStatus=Q3View_SetDrawContext
>>>> (gDocumento3D.fView,myDrawContext);
>>>>
>>>>
>>>> Do you think it is a correct operation?
>>>> The variable  myStatus is always True but when I call
>>>> Q3View_StartRendering program crash.
>>>>
>>>>         
>>> I think you probably want to set propData.copyToPixmapAtFrameEnd to
>>> kQ3True, if you want to see a rendered image in the Pixmap.  You
>>> would only set propData.copyToPixmapAtFrameEnd to kQ3False if you
>>> want to get the image in some other way such as using glReadPixels.
>>>
>>> When you replace drawContextDisplay with myDrawContext as the draw
>>> context associated with the view gDocumento3D.fView, it probably
>>> means that drawContextDisplay is no longer a valid draw context, so
>>> it is not a good value for propData.masterDrawContext.  When I have
>>> used kQ3DrawContextPropertyAcceleratedOffscreen, I used different
>>> view objects for the PixMap draw context and the on-screen master
>>> draw context.
>>>
>>>
>>>       
>>>> James W. Walker ha scritto:
>>>>
>>>>         
>>>>> On Sep 11, 2007, at 2:35 AM, Daniele Cavallini wrote:
>>>>>
>>>>>
>>>>>
>>>>>           
>>>>>> You are right in Mac there is not problem.
>>>>>> I work with a imac intel  core due with video card  ATI Radeon  
>>>>>> x1600
>>>>>> I can well compare mac os x and windows xp.
>>>>>>
>>>>>> I tried to use kQ3DrawContextPropertyAcceleratedOffscreen:
>>>>>>
>>>>>> TQ3Boolean    theFlag = kQ3True;
>>>>>> Q3Object_SetProperty( fRenderer, kQ3RendererPropertyShadows,sizeof
>>>>>> (theFlag), &theFlag );
>>>>>> Q3Object_SetProperty( fRenderer,
>>>>>> kQ3DrawContextPropertyAcceleratedOffscreen,sizeof(theFlag),
>>>>>> &theFlag );
>>>>>>
>>>>>>
>>>>>> but without success.
>>>>>>
>>>>>>
>>>>>>             
>>>>> kQ3DrawContextPropertyAcceleratedOffscreen is a property that  
>>>>> must be
>>>>> set on the draw context, not the renderer.  That's why it's  
>>>>> called a
>>>>> draw context property.  Also, the value is not a TQ3Boolean.   
>>>>> See the
>>>>> documentation in QuesaDrawContext.h.
>>>>>
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