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# Compression Commit

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This commit performs both lossless and lossy compression on every .obj and .png in homedecor. The .png files were all 100% losslessly compressed using ect.exe and optipng.exe (more details below) at maximum settings. The .obj files were lossy-compressed so that comments were removed, trailing 000's were removed and all numbers rounded to 3 decimal places max. Blender exports at 6 decimal places but for minetest, 3 decimal places is the absolute maximum a person with anything under a 256K screen will ever need.

## Results
```
Original entire modpack size: 6343.5 KB
New entire modpack size:      5312.2 KB
Total Reduction:              1031.3 KB  (16.3% less)
```
Please note that actual media size is likely more like 4,500 KB so media reduction is more around 20-25%.

## Details / What actions were actually performed

Used these programs:

https://github.com/ExeVirus/Compress-Obj

https://sourceforge.net/projects/optipng/

https://github.com/fhanau/Efficient-Compression-Tool

Ran this command on every .obj: (fast)

```
luajit.exe compress.lua -f <file> -precision 3
```

Ran these commands on every .png: (slow)
```
ect.exe  -9 -strip --allfilters-b <file>
optipng.exe -o7 -strip all -clobber <file>
```

Note that for future compression, I recommend only using optipng.exe instead of both. ECT can get better results but it takes a LOT longer and only ever saves another 1-2% of the file size. Not worth an extra 10-20 seconds per texture file in my opinion.

## Time spent

Roughly 2 Hours from start to finish + commit + PR
This commit is contained in:
ExeVirus
2021-01-23 07:28:20 -05:00
parent a57723df7d
commit f9ca183f2a
827 changed files with 88657 additions and 89231 deletions
Download Patch File Download Diff File Expand all files Collapse all files

47
computer/models/computer_tower.obj
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@ -1,29 +1,24 @@
# Blender v2.72 (sub 0) OBJ File: ''
# www.blender.org
mtllib computer_tower.mtl
o Cube.001
v -0.182508 -0.499998 0.450000
v -0.182508 -0.499998 -0.349946
v 0.182508 -0.499998 -0.349946
v 0.182508 -0.499998 0.450000
v -0.182508 0.335734 0.450000
v 0.182508 0.335734 0.450000
v 0.182508 0.335734 -0.349946
v -0.182508 0.335734 -0.349947
vt 0.999994 0.750017
vt 0.500006 0.749983
vt 0.500002 0.499996
vt 0.999997 0.500009
vt 0.499989 0.999941
vt 0.999986 0.999931
vt 0.500005 0.000003
vt 0.000007 0.500002
vt -0.000003 0.000003
vt 0.250005 0.999991
vt 0.250005 0.499995
vt 0.999993 0.000002
vt 0.000017 0.999997
usemtl Material.001
v -0.183 -0.5 0.45
v -0.183 -0.5 -0.35
v 0.183 -0.5 -0.35
v 0.183 -0.5 0.45
v -0.183 0.336 0.45
v 0.183 0.336 0.45
v 0.183 0.336 -0.35
v -0.183 0.336 -0.35
vt 1 0.75
vt 0.5 0.75
vt 0.5 0.5
vt 1 0.5
vt 0.5 1
vt 1 1
vt 0.5 0
vt 0 0.5
vt 0 0
vt 0.25 1
vt 0.25 0.5
vt 1 0
vt 0 1
s off
f 1/1 2/2 3/3 4/4
f 5/5 6/2 7/1 8/6