[x3d-public] VolumeRendering > gradient texture format?

[GPU Group]

Q. what texture file formats are used for 3D gradient 'surfaceNormals'
textures for volume rendering styles and ISOVolueData 'gradient'?
Thanks,
Doug Sanden
I used a few formats
- .web3dit - a home grown format, no one else using
- .nrrd with 3 values packed in 4-byte int and a custom key=value
"nchannel:=3" , made with teem NrrdIO.lib and hack of their sample.c program
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