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authorNorbert Preining <norbert@preining.info>2024-11-13 03:03:42 +0000
committerNorbert Preining <norbert@preining.info>2024-11-13 03:03:42 +0000
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-# Simple HDR cubemap to longlat(longitude latitude. or known as equirectangular) converter.
-
-## Requirements
-
-* C++11 compiler
-
-## Coordinate definition.
-
-* Y-up
-* Right-handed
-* Center is -z
-
-## Usage
-
-Assume cubemap image is given by 6 images(6 faces).
-
-```
-$ ./cube2longlat px.exr nx.exr py.exr ny.exr pz.exr nz.exr 512 longlat.exr (phi_offset)
-```
-
-Optional `phi_offset` is used to add offset(by angle) to phi to rotate X and Z faces.
-
-
-## Supported input image format
-
-* [ ] RGBM(Filament's RGBM encoding. Multiplier is 16, and gamma corrected) Implemented but not tested.
-* [x] EXR
-
-## Supported output image format
-
-* [ ] RGBM(Filament's RGBM encoding. Multiplier is 16, and gamma corrected) Implemented but not tested.
-* [x] EXR
-* [x] RGBE
-
-## Note
-
-When you create cubemap using Filament's cmgen https://github.com/google/filament/tree/master/tools/cmgen , its generated cubemap images are mirrored by X direction.
-Use `--mirror` when invoking `cmgen` if required.
-
-## TODO
-
-* Single cubemap image(cross layout)
-* Better antialiasing
-* theta offset
-* Mirroring.
-