Source formats/fdmesh.ksy (Kaitai Struct). Grid of normalised dome-UV coordinates per display vertex. Row-major, row 0 = top of the display image,
column 0 = left; vertex (c, r) sits at x = c / (cols - 1) * width, y = r / (rows - 1) * height.
Dome UV (azimuthal equidistant, dome frame): r = (90 - elevation) / 180, u = 0.5 + r * sin(azimuth),
v = 0.5 - r * cos(azimuth); (0.5, 0.5) = zenith, r = 0.5 = spring line, azimuth 0 = front (-Z), clockwise from above.
Weight (channels = 3): >= 0 used (intensity multiplier), < 0 unused. File size is exactly
24 + 4 * cols * rows * channels bytes.
| id | type | size / repeat | doc |
|---|---|---|---|
magic | contents [70,68,77,69,83,72,0,0] | "FDMESH\0\0" | |
version | u2 | ||
flags | u2 | reserved; writers write 0, readers ignore | |
cols | u4 | ||
rows | u4 | ||
channels | u4 | 2 = (u, v), 3 = (u, v, weight) | |
vertices | vertex | repeat expr cols * rows | |
trailing | bytes | no bytes may follow the grid |
| id | type | size / repeat | doc |
|---|---|---|---|
u | f4 | ||
v | f4 | ||
weight | f4 | if _parent.channels == 3 |
Graphviz: fdmesh.dot (render with dot -Tsvg).
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