Hi Stefano,
Stefano wrote:
> Hi there,
> I'm trying to copy the render of a viewport into a texture with a
> TextureGrabForeground to do some multipass.. here's my code..
>
> ImagePtr img = Image::create();
> addRefCP(img);
> beginEditCP(img);
> img->set(Image::OSG_RGBA_PF,1);
> endEditCP(img);
>
> TextureChunkPtr tex = TextureChunk::create();
> addRefCP(tex);
> beginEditCP(tex);
> tex->setImage(img);
> tex->setMinFilter(GL_NEAREST);
> tex->setMagFilter(GL_NEAREST);
> tex->setInternalFormat(GL_RGBA8);
> tex->setExternalFormat(GL_RGBA);
> tex->setScale(true);
> endEditCP(tex);
>
> TextureGrabForegroundPtr tg = TextureGrabForeground::create();
> addRefCP(tg);
> beginEditCP(tg);
> tg->setTexture(tex);
> endEditCP(tg);
>
> is there something wrong in these lines? Cause the alpha channel is
> 1.0 everywhere.. even if the shader i used to render the viewport in
> the previous step has a global alpha of 0.5!
Hm, the TGF just uses glCopyTexSubImage, which doesn't do anything to the
components. Does your framebuffer have an alpha component?
Dirk
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