Re: Problem with shadow render opengl

[James W. W. <os...@jw...>]

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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