int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
{
const float phi = atan2f(vec[0], -vec[2]) * s->input_mirror_modifier[0] / s->iflat_range[0];
- const float theta = atan2f(-vec[1], hypotf(vec[0], vec[2])) * s->input_mirror_modifier[1] / s->iflat_range[1];
+ const float theta = asinf(-vec[1]) * s->input_mirror_modifier[1];
const float uf = (phi + 1.f) * (width - 1) / 2.f;
- const float vf = (tanf(theta) + 1.f) * height / 2.f;
+ const float vf = (tanf(theta) / s->iflat_range[1] + 1.f) * height / 2.f;
const int ui = floorf(uf);
const int vi = floorf(vf);