Provided by: libfilament-tools_1.9.25+dfsg3-1_amd64 
NAME
cmgen - filament material tools
DESCRIPTION
cmgen is a command-line tool for generating SH and mipmap levels from an env map. Cubemaps and
equirectangular formats are both supported, automatically detected according to the aspect ratio of the
source image.
Usages:
cmgen [options] <input-file> cmgen [options] <uv[N]>
Supported input formats:
PNG, 8 and 16 bits Radiance (.hdr) Photoshop (.psd), 16 and 32 bits OpenEXR (.exr)
OPTIONS
--help, -h
Print this message
--license
Print copyright and license information
--quiet, -q
Quiet mode. Suppress all non-error output
--type=[cubemap|equirect|octahedron|ktx], -t [cubemap|equirect|octahedron|ktx]
Specify output type (default: cubemap)
--format=[exr|hdr|psd|rgbm|rgb32f|png|dds|ktx], -f [exr|hdr|psd|rgbm|rgb32f|png|dds|ktx]
Specify output file format. ktx implies -type=ktx. KTX files are always encoded with 3-channel
RGB_10_11_11_REV data
--compression=COMPRESSION, -c COMPRESSION
Format specific compression:
KTX:
astc_[fast|thorough]_[ldr|hdr]_WxH, where WxH is a valid block size s3tc_rgba_dxt5
etc_FORMAT_METRIC_EFFORT
FORMAT is rgb8_alpha, srgb8_alpha, rgba8, or srgb8_alpha8 METRIC is rgba, rgbx, rec709, numeric,
or normalxyz EFFORT is an integer between 0 and 100
PNG: Ignored PNG RGBM: Ignored Radiance: Ignored Photoshop: 16 (default), 32 OpenEXR: RAW, RLE,
ZIPS, ZIP, PIZ (default) DDS: 8, 16 (default), 32
--size=power-of-two, -s power-of-two
Size of the output cubemaps (base level), 256 by default Also applies to DFG LUT
--deploy=dir, -x dir
Generate everything needed for deployment into <dir>
--extract=dir
Extract faces of the cubemap into <dir>
--extract-blur=roughness
Blurs the cubemap before saving the faces using the roughness blur
--clamp
Clamp environment before processing
--no-mirror
Skip mirroring of generated cubemaps (for assets with mirroring already backed in)
--ibl-samples=numSamples
Number of samples to use for IBL integrations (default 1024)
--ibl-ld=dir
Roughness pre-filter into <dir>
--sh-shader
Generate irradiance SH for shader code
Private use only:
--ibl-dfg=filename.[exr|hdr|psd|png|rgbm|rgb32f|dds|h|hpp|c|cpp|inc|txt]
Compute the IBL DFG LUT
--ibl-dfg-multiscatter
If --ibl-dfg is set, computes the DFG for multi-scattering GGX
--ibl-dfg-cloth
If --ibl-dfg is set, adds a 3rd channel to the DFG for cloth shading
--ibl-is-mipmap=dir
Generate mipmap for pre-filtered importance sampling
--ibl-irradiance=dir
Diffuse irradiance into <dir>
--ibl-no-prefilter
Use importance sampling instead of prefiltered importance sampling
--ibl-min-lod-size
Minimum LOD size [default: 16]
--sh=bands
SH decomposition of input cubemap
--sh-output=filename.[exr|hdr|psd|rgbm|rgb32f|png|dds|txt]
SH output format. The filename extension determines the output format
--sh-irradiance, -i
Irradiance SH coefficients
--sh-window=cutoff|no|auto (default), -w cutoff|no|auto (default)
SH windowing to reduce ringing
--debug, -d
Generate extra data for debugging
Cubemaps and equirectangular formats are both supported, automatically detected according to the aspect
ratio of the source image.
Usages:
cmgen [options] <input-file> cmgen [options] <uv[N]>
Supported input formats:
PNG, 8 and 16 bits Radiance (.hdr) Photoshop (.psd), 16 and 32 bits OpenEXR (.exr)
--help, -h
Print this message
--license
Print copyright and license information
--quiet, -q
Quiet mode. Suppress all non-error output
--type=[cubemap|equirect|octahedron|ktx], -t [cubemap|equirect|octahedron|ktx]
Specify output type (default: cubemap)
--format=[exr|hdr|psd|rgbm|rgb32f|png|dds|ktx], -f [exr|hdr|psd|rgbm|rgb32f|png|dds|ktx]
Specify output file format. ktx implies -type=ktx. KTX files are always encoded with 3-channel
RGB_10_11_11_REV data
--compression=COMPRESSION, -c COMPRESSION
Format specific compression:
KTX:
astc_[fast|thorough]_[ldr|hdr]_WxH, where WxH is a valid block size s3tc_rgba_dxt5
etc_FORMAT_METRIC_EFFORT
FORMAT is rgb8_alpha, srgb8_alpha, rgba8, or srgb8_alpha8 METRIC is rgba, rgbx, rec709, numeric,
or normalxyz EFFORT is an integer between 0 and 100
PNG: Ignored PNG RGBM: Ignored Radiance: Ignored Photoshop: 16 (default), 32 OpenEXR: RAW, RLE,
ZIPS, ZIP, PIZ (default) DDS: 8, 16 (default), 32
--size=power-of-two, -s power-of-two
Size of the output cubemaps (base level), 256 by default Also applies to DFG LUT
--deploy=dir, -x dir
Generate everything needed for deployment into <dir>
--extract=dir
Extract faces of the cubemap into <dir>
--extract-blur=roughness
Blurs the cubemap before saving the faces using the roughness blur
--clamp
Clamp environment before processing
--no-mirror
Skip mirroring of generated cubemaps (for assets with mirroring already backed in)
--ibl-samples=numSamples
Number of samples to use for IBL integrations (default 1024)
--ibl-ld=dir
Roughness pre-filter into <dir>
--sh-shader
Generate irradiance SH for shader code
Private use only:
--ibl-dfg=filename.[exr|hdr|psd|png|rgbm|rgb32f|dds|h|hpp|c|cpp|inc|txt]
Compute the IBL DFG LUT
--ibl-dfg-multiscatter
If --ibl-dfg is set, computes the DFG for multi-scattering GGX
--ibl-dfg-cloth
If --ibl-dfg is set, adds a 3rd channel to the DFG for cloth shading
--ibl-is-mipmap=dir
Generate mipmap for pre-filtered importance sampling
--ibl-irradiance=dir
Diffuse irradiance into <dir>
--ibl-no-prefilter
Use importance sampling instead of prefiltered importance sampling
--ibl-min-lod-size
Minimum LOD size [default: 16]
--sh=bands
SH decomposition of input cubemap
--sh-output=filename.[exr|hdr|psd|rgbm|rgb32f|png|dds|txt]
SH output format. The filename extension determines the output format
--sh-irradiance, -i
Irradiance SH coefficients
--sh-window=cutoff|no|auto (default), -w cutoff|no|auto (default)
SH windowing to reduce ringing
--debug, -d
Generate extra data for debugging
cmgen is a command-line tool for generating SH... October 2021 CMGEN(1)