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 new stereographic view type (-vts), and that the view direction is up (-vd 0 0 1).

Site
Latitude ° North South
View
Projection
Up Vector -vu
Diagram
Dimensions px
Grid colour
Sun path colour
Altitude grid every °
Azimuth grid every °
Labels label hour lines with pt font

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

Example

sun path overlay
Radiance stereographic fisheye rendering with overlaid sun path diagram.
The outside objects are mirrored in the pane of glass through which
a person is looking out. Local solar time is 13:00 hrs, on the 21st of April.