[osg-users] Get RGB Values from Textrue

[Sebastian Messerschmidt]

Hi Maxim,

> Hi,
> 
> I have a osg::Texture2D that I'm using as a render to texture target.
> I can see that it is working on the screen, but I need to have access to the RGB values of the texture itself so I can also copy them to another API.
> 
> How can I access the RGB values?

set a postDrawCallback to the pass/camera that writes to the texture.


In the callback:

virtual void operator () (osg::RenderInfo& render_info) const
     {
	osg::State* state=render_info.getState();
	state->apply(render_info.getCurrentCamera()->getStateSet());
	state->applyTextureAttribute(0, mTexture);
	mTexture->apply(*state);
	mImage->readImageFromCurrentTexture(render_info.getContextID(),true, 
GL_FLOAT ); //change the GL_FLOAT to your needs
     }

the mTexture is passed to the callback using the original texture 
attached to the MRT.

Cheers
Sebastian




> 
> After rendering a frame, if I access _image in the texture2D class, it is null, but I do see that the Texture of texture2D has an array size of 1.
> How and where are the RGB values stored?
> 
> Thank you!
> 
> Maxim
> 
> ------------------------
> Thank you,
> --Maxim
> 
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=72322#72322
> 
> 
> 
> 
> 
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