Re: Problem with shadow render opengl

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

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;
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?
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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