Cubic to equirectangular projection algorithm

Question

I have a cube map texture which defines a surrounding, however I need to pass it to a program which only works with latitude/longitude maps. I am really at lost here on how to d

Answer 1

I think from your algorithm in Python you might have inverted x and y in the calculation of theta and phi.

def spherical_coordinates(x, y):
    return (math.pi*((y/h) - 0.5), 2*math.pi*x/(2*h), 1.0)

from Paul Bourke's website here

theta = x pi phi = y pi / 2

and in your code you are using y in the theta calculation and x in the phi calculation.

Correct me if I am wrong.