cModules.PBRTiler.MathAlgorithms module

calculate_homography(source_pts, dest_pts)

Constructs the 8-parameter Homography matrix (H)

source_pts: [(u1, v1), (u2, v2), (u3, v3), (u4, v4)]

dest_pts: [(x1, y1), (x2, y2), (x3, y3), (x4, y4)]

Returns the mapping matrix transforming Dest to Source.

frankot_chellappa(np_normal_map)

Frankot-Chellappa algorithm to convert a Normal map to a Height map.

np_normal_map: numpy array shape (H, W, 3) in range [0, 1]

Returns: Height map numpy array shape (H, W) mapped roughly to [0, 1]

calculate_seam_energy_offset(luma_map)

Uses Phase Correlation / FFT to find optimal tiling offset.

luma_map: 2D array [0,1]

Returns optimal (dx, dy) offset (normalized 0..1)