equirectangular-image-rotation

objective-c template for rotating equirectangular image

Original image

After roll,yaw and pitch rotation

A spherical panorama that uses an equirectangular projection can be rotated by converting the uv's coodinate to spherical coordinate system and then to cartesian. The coordinates are appled by a 3x3 rotation matrix according to roll, yaw and pitch. Everything is then converted back to uv and sampled from the original texture.

Website reference: https://en.wikipedia.org/wiki/Rotation_matrix

The method used

-(UIImage*) applyRectRotation:(UIImage*) image

The class used

customFilter.h
customFilter.m