# Compression Commit

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

homedecor_office/models/homedecor_calendar.obj

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homedecor_office/models/homedecor_desk.obj

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homedecor_office/models/homedecor_filing_cabinet.obj

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+v -0.437 -0.437 -0.5
+v 0.438 -0.437 -0.5
+v -0.437 0.438 -0.5
+v 0.438 0.438 -0.5
+vt 1 1
+vt 0 1
+vt 0 0
+vt 1 0
+vt 0.938 0.938
+vt 0.063 0.938
+vt 0.063 0.063
+vt 0.938 0.063
+vt 0.938 0.125
+vt 0.063 0.125
+vt 0.125 0.063
+vt 0.125 0.938
+vt 0.063 0.875
+vt 0.938 0.875
+vt 0.875 0.938
+vt 0.875 0.063
+vn -1 0 0
+vn 0 0 -1
+vn 1 0 0
+vn 0 0 1
+vn 0 1 0
+vn 0 -1 0
+g 1
 s off
 f 5/1/1 6/2/1 2/3/1 1/4/1
 f 6/1/2 7/2/2 3/3/2 2/4/2
 f 7/1/3 8/2/3 4/3/3 3/4/3
 f 8/1/4 5/2/4 1/3/4 4/4/4
 f 8/2/5 7/3/5 6/4/5 5/1/5
-g Cylinder_Cylinder_drawer
+g 2
 f 15/5/2 16/6/2 14/7/2 13/8/2
 f 10/7/6 9/8/6 13/9/6 14/10/6
 f 12/6/3 10/7/3 14/11/3 16/12/3
 f 11/5/5 12/6/5 16/13/5 15/14/5
 f 9/8/1 11/5/1 15/15/1 13/16/1
-g Cylinder_Cylinder_bottom
+g 3
 f 1/4/6 2/1/6 3/2/6 4/3/6