Forked from https://github.com/madwyn/Cube2Cyl.

A panoramic lib, cubic to equirectangular projection conversion (X, Y represent the angles inside a sphere)

Read more details of implementation here: http://www.wenyanan.com/cube2cyl/

The Cube2Cyl library is a single header file library, written in C++. There is a demo application included as usage example.

The library takes the following parameters:

Width of the panorama (must be lager than 1)
Height of the panorama (must be lager than 1)
Width of the square input (the input must have a ratio of 1:1)
View portion horizontally, [0.01, 2π]
View portion vertically, [0.01, π]

This library takes any valid parameter and deals the ratio changes automatically. You can use super sampling to generate accurate panorama.

For the maximum performance, using a precomputed map is recommended rather than doing the calculation for each frame.