Sun Path Overlay for Radiance Fisheye View
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This form assumes that the Radiance rendering for which you are generating the sun path overlay has been generated with the stereographic view type (-vts), and that the view direction is up (-vd 0 0 1).
Usage
To overlay the diagram sp_overlay.png onto the rendering rendering.jpg, use this command line which relies on ImageMagick's composite program. The new image will be named final.png:
$ composite -compose Dst_Over rendering.jpg sp_overlay.png final.png