Hi everybody,
I want to use the osg::Image function readPixels to read back depth
buffer values. But the depth buffer values are float values and I wonder
how to get the float values of the image object. I set the image
parameters like this.
osg::Image* image = new osg::Image();
image->allocateImage(width, height, 1, GL_LUMINANCE, GL_FLOAT);
Then I call readPixels to read back the depth values:
image->readPixels(posx, posy, width, height, GL_DEPTH_COMPONENT, GL_FLOAT);
But the function image->data() returns an unsigned char array instead of
a float array. How do I get the float values of that image? Or is it
even impossible to return the float data of the image?
In that case, if I can't get the correct float values, I can use the
OpenGL function glReadPixels instead. But then I have a problem reading
back the depth values of viewports that are positioned behind the main
viewport. Does anyone have a hint for me?
regards,
Oliver
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