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First time I've used cycles rendering engine. I'm using a movie clip as the background in short animation. Selected RBGA under Property Tab, and Transparent under Film Tab. It looks good and individual frames in OpenGL active viewport render, and looks fine.

When I try to get it to spit out PNG files of the finished animation the objects render out fine, except no movie clip background as Blender Render engine did when using Paper Sky setting. Operator error, or am I trying to do something Cycles won't do? Haven't found an answer in my searches so far. Can anyone point me in the right direction please.

Addition: I think I found my problem after a couple more hours of research. Post should read "operator ignorance" instead of operator error. Too tired to try the solution tonight, everything looks better in the morning. Thanks anyway.

Sorry, I just saw your posts. Really tired. Much appreciation.

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  • $\begingroup$ Do you want the movie clip background to influence (i.e. light) the scene? If not I would add it in the compositor. $\endgroup$ – PGmath Sep 13 '15 at 3:34
  • $\begingroup$ Do you want a transparent background or not? And what do you mean by "movie clip background"? Seems to me that if you want a movie clip for the sky you wouldn't want the sky to be transparent. I'm confused. Please clarify. $\endgroup$ – Mentalist Sep 13 '15 at 3:55
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Images (of movie clips) used as background in the 3D viewport are primarily meant to be used as reference and will not render.

Here are a couple of alternatives:

  • Using the compositor

    Add an Input>Movie Clip node, and use an alpha over node to compose the render layers over it.

    enter image description here

    For single images use an Input>Image node.

    enter image description here

    If youare using cycles make sure that you enable Film Transparent, so that the rendered layers render with a transparent background:

    enter image description here

  • Without the compositor

    Without using additional geometry or compositing, you can use the image as background for the world. Set the Texture coordinates to Window.

    enter image description here

    In this case disable Film>Transparent

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