.vox -> obj -> glb with gltfpack renders corrert with babylon but not with three

[arpu]

HI,

not sure this is a gltfpack problem or threejs

zip obj mtl + png and result glb
https://drive.google.com/file/d/1wCXw9GYepyUm9DZt_gFDaZaBWx2qpBHL/view?usp=sharing

gltfpack output

gltfpack -tp -tc -i 1-Monkey.obj -o test_monkey.glb -vv
toktx: error while loading shared libraries: libktx.so.4: cannot open shared object file: No such file or directory
toktx --version => 32512
Basis Universal GPU Texture Compressor Reference Encoder v1.12.00
Copyright (C) 2019-2020 Binomial LLC, All rights reserved
basisu -version => 0
input: 0 nodes, 0 meshes (1 primitives), 1 materials, 0 skins, 0 animations
input: 1 mesh primitives (1064 triangles, 3192 vertices); 1 draw calls (1 instances, 1064 triangles)
basisu -mipmap -comp_level 1 -q 192 -file /tmp/gltfpack-XhqDWo.png -output_file /tmp/gltfpack-C6mMDp.basis => 0
output: 1 mesh primitives (1064 triangles, 1606 vertices); 1 draw calls (1 instances, 1064 triangles)
output: 1 nodes, 1 meshes (1 primitives), 1 materials
output: JSON 1539 bytes, buffers 33436 bytes
output: buffers: vertex 25696 bytes, index 6384 bytes, skin 0 bytes, time 0 bytes, keyframe 0 bytes, instance 0 bytes, image 1355 bytes
stats: vertex POSITION: compressed 12848 bytes (64.0 bits), raw 12848 bytes (64 bits)
stats: vertex NORMAL: compressed 6424 bytes (32.0 bits), raw 6424 bytes (32 bits)
stats: vertex TEXCOORD: compressed 6424 bytes (32.0 bits), raw 6424 bytes (32 bits)
stats: index index: compressed 6384 bytes (16.0 bits), raw 6384 bytes (16 bits)

render in three viewer https://gltf-viewer.donmccurdy.com/

babylon sandbox

the obj exported in MagicaVoxel-0.99.6.3-win64 from .vox file

[arpu]

wups i see the error :> toktx: error while loading shared libraries: libktx.so.4: cannot open shared object file: No such file or directory

[arpu]

ok updated to lates KTX_Software

glb in viewer looks now

gltfpack -tp -tc -i 1-Monkey.obj -o test_monkey.glb -vv
toktx v4.0.0-rc1~6
toktx --version => 0
input: 0 nodes, 0 meshes (1 primitives), 1 materials, 0 skins, 0 animations
input: 1 mesh primitives (1064 triangles, 3192 vertices); 1 draw calls (1 instances, 1064 triangles)
toktx --t2 --2d --genmipmap --nowarn --resize 256x4 --bcmp --clevel 1 --qlevel 192 --srgb -- /tmp/gltfpack-3kluxB.ktx2 /tmp/gltfpack-hxGzrD.png => 0
output: 1 mesh primitives (1064 triangles, 1606 vertices); 1 draw calls (1 instances, 1064 triangles)
output: 1 nodes, 1 meshes (1 primitives), 1 materials
output: JSON 1539 bytes, buffers 33188 bytes
output: buffers: vertex 25696 bytes, index 6384 bytes, skin 0 bytes, time 0 bytes, keyframe 0 bytes, instance 0 bytes, image 1107 bytes
stats: vertex POSITION: compressed 12848 bytes (64.0 bits), raw 12848 bytes (64 bits)
stats: vertex NORMAL: compressed 6424 bytes (32.0 bits), raw 6424 bytes (32 bits)
stats: vertex TEXCOORD: compressed 6424 bytes (32.0 bits), raw 6424 bytes (32 bits)
stats: index index: compressed 6384 bytes (16.0 bits), raw 6384 bytes (16 bits)

[arpu]

thx for looking at this,

some findings:
without -tc the glb renders fine on Linux chome/firefox and threejs viewer https://gltf-viewer.donmccurdy.com/ ( r126)

with -tc and -tp
(toktx --t2 --2d --genmipmap --nowarn --resize 256x4 --bcmp --clevel 1 --qlevel 192 --srgb -- /tmp/gltfpack-wGbFFB.ktx2 /tmp/gltfpack-ThRHCC.png => 0
)

firefox/chrome on linux no colors

will test the glb on windows later

[arpu]

ok looks like the problem comes from newer master KTX-Software

version i use is from master aee7a1c5d01c97f22d8a931f7c3f09c2e2e87a7f

[arpu]

i can confirm with KTX-Software toktx v4.0.0-beta8~5 7ad9caf1efd4d970fb993867dbe4c720552e6b02

the ktx2 glb verson works fine in threejs and babylon on Linux

[zeux]

I recommend comparing the output of ktxinfo 1-Monkey.ktx2 after running the following command with both versions of toktx:

toktx --t2 --2d --genmipmap --nowarn --resize 256x4 --bcmp --clevel 1 --qlevel 192 --srgb 1-Monkey.ktx2 1-Monkey.png 

I suspect what happens is that after KhronosGroup/KTX-Software@2ffdc81 the color primaries information in the output file is wrong, and on Linux it results in transcoding to a luminance-alpha format mistakenly (whereas on Windows it's not available so it works fine)

edit although maybe it's not that, I ran older & newer toktx myself and the DFD is the same between these. Not sure what exactly the problem is then.

[arpu]

ok not sure what it fixed but with latest KTX_Software 3acee50ae009f5d5b4e4dbacbc3a515d4a7b89ef all looks fine now!

i think this Question is Answered.