PanoramaRemap

class PanoramaRemap

Equirectangular panoramas resampled onto cube-map faces, headless and in float: the step between an HDRI as it is distributed (one 2:1 lat-long image) and what an image-based-lighting pipeline wants (six faces, the order and orientation load_cube_map() uses).

Face i, texel (s, t) – t growing DOWN the face – looks along 0 +X ( 1, y, -x) 1 -X (-1, y, x) 2 +Y ( x, -1, y) 3 -Y ( x, 1, -y) 4 +Z ( x, y, 1) 5 -Z (-x, y, -1) with x = -1 + 2 s / (n - 1) and y = 1 - 2 t / (n - 1), and the direction (dx, dy, dz) samples the panorama at u = atan2(dx, dy) / 2pi + 0.5 (mod 1), v = 0.5 - asin(dz) / pi, pixel (u (w - 1), v (h - 1)).

Inheritance diagram

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PanoramaRemap.__init__()

static PanoramaRemap.cube_face_direction()

The (unnormalised) view direction of texel (s, t) of a cube face; t grows down the face.

static PanoramaRemap.equirect_to_cube_face()

One cube face of the panorama, face_size square, with as many channels as the source. Bilinear filtering (clamped at the panorama’s edges) unless bilinear is false, which takes the nearest texel.