- Converts OpenEXR latitude-longitude environment maps into cube-face environment maps or vice versa.
- Reads an environment map image from infile, converts it, and stores the result in outfile.
usage: helloEnvironmentMap [options] infile outfile
If the input file name contains a % then an input cube-face environment map is assembled from six
square sub-images that represent the six faces of the cube. The names of the six image files are generated
by replacing the % with +X, -X, +Y, -Y, +Z, and -Z respectively.
If the output file name contains a % and helloMacOSOpenEXR has been instructed to produce a cube-face
environment map, then the output image is split into six square sub-images that are saved in six separate
output files. The names of the files are generated by replacing the % with +X, -X, +Y, -Y, +Z, and -Z
respectively.
| Option | Description |
|---|---|
| -o | produces a ONE_LEVEL output file (default) |
| -m | produces a MIPMAP_LEVELS output file (-m has no effect if the output image is split into multiple files) |
| -c | the output file will be a cube-face environment map (default) |
| -l | the output file will be a latitude-longitude environment map |
| -ci | the input file is interpreted as a cube-face environment map, regardless of its envmap attribute |
| -li | the input file is interpreted as a latitude-longitude environment map, regardless of its envmap attribute (-li has no effect if the input image is assembled from multiple files) |
| -w x | sets the width of the output image to x pixels (default is 256). The height of the output image will be x*6 pixels for a cube-face map, or x/2 pixels for a latitude-longitude map. |
| -f r n | sets the antialiasing filter radius to r (default is 1.0) and the sampling rate to n by n (default is 5 by 5). Increasing r makes the output image blurrier; decreasing r makes the image sharper but may cause aliasing. Increasing n improves antialiasing, but generating the output image takes longer. |
| -b | blurs the environment map image by applying a 180-degree-wide filter kernel such that point-sampling the blurred image at a location that corresponds to 3D direction N returns the color that a white diffuse reflector with surface normal N would have if it was illuminated using the original non-blurred image. Generating the blurred image can be fairly slow. |
| -t x y | sets the output file's tile size to x by y pixels (default is 64 by 64) |
| -p t b | if the input image is a latitude-longitude map, pad the image at the top and bottom with th and bh extra scan lines, where h is the height of the input image. This is useful for images from 360-degree panoramic scans that cover less than 180 degrees vertically. |
| -d | sets level size rounding to ROUND_DOWN (default) |
| -u | sets level size rounding to ROUND_UP |
| -z x | sets the data compression method to x (none/rle/zip/piz/pxr24/b44/b44a/dwaa/dwab, default is zip) |
| -v | verbose mode |
| -h | prints this message |
helloEnvironmentMap -li -c -w width in-equilateral.exr out-cubic%.exr width is lat-long width/4
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