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I'd like to create an animation (mp4 video) with a completely white background and use a hdri environment texture for lighting.
If it was just an image I'd have no problems, simply by setting Film to Transparent under Render options and then the PNG to RGBA, I could easily add a white background to the image subsequently using some photo editor.
But what about animations? If I do the same thing, so I set Film to Transparent, the video gets a black background.
Is it possible somehow?
This one uses transparent option in the render panel.
With use transparent checked, we can use the compositor to add in the white background before blender saves the file.
Check use nodes in the compositor, and then add the alpha over node, and drop it between the render layer and the output, and voila, we have our white background!
To create a colored background with and HDR we want everything but the camera to see the world as the HDR, and the camera to see it as white. To do this we can use the Light Path node. use the Is Camera Ray attribute to see if the camera is what is looking at the sky, if it is, show white. If not, show HDR.
