Python-Spherical-Projection

Convert cubemap image to an equirectangular spherical projection image using Python 2.7.

Currently only works with cubemaps laid out in the following format:

         ________
        |        |
        |   top  |
        |        |
 _______|________|_________________
|       |        |        |        |
| left  |  front |  right |  back  |
|       |        |        |        |
|_______|________|________|________|
        |        |
        |        |
        |  down  |
        |________|

Input Image

Output Image

Instructions

• Open an image using PIL or equivalent.
• Calculate dimensions of output image. (Width must be 2xheight. Height can be any percentage of input image, but larger output images lead to less precise results.)
• Calculate length of each square face (ie. 1/3 height of the input, due to height being made from 3 faces - top,front,down)
• Create an output image using the new dimensions.
• For each pixel location in the output image run cube2equi.find_corresponding_pixel() to return the corresponding pixel in the input image.
• Take the colour value for the input image pixel and apply it to the pixel in the output.

TODO

• Automate all setup steps
• Allow for different cubemap layouts