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OpenGL Transparent windowed apps and D3D rendering

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Hello people, I want to do something rather exotic in Direct3D. I'm writing a desktop tool that I want to create some fancy particle effects on the desktop. For the effects I want to use Direct3D. My initial plan was to create an invisible window to render too, then copy the rendered effects to an image control which supports desktop transparency. I have done something similar in OpenGL, but to my experience this copying is slow as hell. I want to check up if it is possible to have a transparent scene in Direct3D, so that you can see the desktop through the Direct3D scene. Is something like this possible?

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I've seen numerous threads from people trying to achieve similar to what you want (searching should reveal the details), but as far as I remember no one ever succeeded.

When you point D3D at a window for rendering it's only really using that as a placeholder knowing where to render to and hooking into messages...

hth
Jack

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