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Is it possible to render a 360 equirectangular OpenGL view from camera? I already know to set it up on Cycles and BI, but I would like to know if it is possible to set this kind of camera to make a realtime render of the OpenGL view for speed render purposes.

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    $\begingroup$ No I don't think it is As far as I know this is not supported in OpenGL yet. Otherwise we'd be able to get panoramic camera previews in the viewport. $\endgroup$ Commented Mar 20, 2017 at 1:43

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You can take 6 rectangle cameras with 90° FOV, which head to East, West, North, South, Up, Down. Then you get faces of a cubebox.
You can map the cubebox into equirectangular in a simple fragment shader or use it directly.

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