float *vec)
{
const float uf = s->flat_range[0] * ((2.f * i) / width - 1.f);
- const float vf = s->flat_range[1] * ((2.f * j) / height - 1.f);
+ const float vf = s->flat_range[1] * ((2.f * j + 1.f) / height - 1.f);
const float phi = -atan2f(vf, uf);
const float theta = -M_PI_2 * (1.f - hypotf(uf, vf));