Hello Carsten,
>> how can I get access to the stencil data from the image?
>> I got the packed depth/stencil image, but how can I readout the stencil data?
>> Is there any functionality available for that?
>
> as far as i understand it the stencil data should be in one of the four
> bytes that make up every pixel in the image. Calling img->getPixel(i)
> you can access the individual bytes:
>
> UInt32 stencilByte = 0;
>
> for(UInt32 h = 0; h < img->getHeight(); ++h)
> {
> for(UInt32 w = 0; w < img->getWidth(); ++w)
> {
> UInt8 p = img->getPixel(stencilByte + 4 * w + (h * img->getWidth()
> * 4));
> }
> }
the Code works fine, but I encountered another problem.
The depth/stencil-Image has no pixel data after the rendering.
The colorimage works fine.
Here is my code for the FBO setup:
OSG::RenderBufferRecPtr colorattachment = OSG::RenderBuffer::create();
OSG::RenderBufferRecPtr fboattachment = OSG::RenderBuffer::create();
colorattachment->setReadBack(true);
fboattachment->setReadBack(true);
colorimage = OSG::Image::create();
colorimage->set(OSG::Image::OSG_RGB_PF, sizex, sizey);
depthimage = OSG::Image::create();
depthimage->set(GL_UNSIGNED_INT_24_8_EXT, sizex, sizey);
colorattachment->setImage(colorimage);
colorattachment->setInternalFormat(GL_RGBA);
fboattachment->setImage(depthimage);
fboattachment->setInternalFormat(GL_DEPTH_STENCIL_EXT);
fbo = OSG::FrameBufferObject::create();
fbo->setWidth(sizex);
fbo->setHeight(sizey);
fbo->setPostProcessOnDeactivate(true);
fbo->setDepthAttachment(fboattachment);
fbo->setStencilAttachment(fboattachment);
fbo->clearColorAttachments();
fbo->setColorAttachment(colorattachment, 0);
//fbo->pushToColorAttachments(colorattachment);
fbo->editMFDrawBuffers()->clear();
fbo->editMFDrawBuffers()->push_back(GL_COLOR_ATTACHMENT0_EXT);
stage->setRenderTarget(fbo);
Do I miss something there?
I thought everything is similar to the colorimage, so it has to work
out, but depthimage->isValid() returns false.
Thanks,
Constantin
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