Hi Martin,
Hi,
I have multiple osg::Images, each one has a transparent background. When
compositing them onto a background image(using copySubImage), this transparent
background is not respected and is instead filled in with white, looking fairly
ugly.
Your approach is sort of akward (if I get it correctly). If you want to
blend images offline, use a image processing tool. If you want to do it
online/with OpenGL use blending, multi-texturing and possibly render to
texture if you need the result as an image.
I do not see any other methods related to compositing images, other than mix().
But, because the images are not the same size, mix() will not work.
What about resizing/resampling them then?
Does some method exist that would respect the transparent backgrounds, or will
I have to roll my own (not that it would be difficult, but I also don't want to
reinvent the wheel)
I still don't get what you want to do. Do you want to do image
processing or rendering? If you need to render, simply use blending or
multitexturing and a shader that does the "composition" math as you desire.
Could you explain, what your process is?
Cheers
Sebastian
Thank you!
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=68113#68113
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