# 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_climate_control/models/homedecor_ac.obj

@@ -1,57 +1,54 @@
-# Blender v2.73 (sub 0) OBJ File: 'ac.blend'
-# www.blender.org
-o Cylinder
-v -0.500000 -0.500000 0.500000
-v -0.500000 -0.500000 -0.500000
-v 0.500000 -0.500000 -0.500000
-v 0.500000 -0.500000 0.500000
-v -0.500000 0.125000 0.500000
-v -0.500000 0.125000 -0.500000
-v 0.500000 0.125000 -0.500000
-v 0.500000 0.125000 0.500000
-v -0.500000 0.125001 0.500000
-v -0.500000 0.125001 -0.500000
-v 0.500000 0.125001 -0.500000
-v 0.500000 0.125001 0.500000
-v -0.500000 0.500000 0.500000
-v -0.500000 0.500000 -0.500000
-v 0.500000 0.500000 -0.500000
-v 0.500000 0.500000 0.500000
-v -0.500000 0.374999 0.500000
-v -0.500000 0.250001 -0.500000
-v 0.500000 0.250001 -0.500000
-v 0.500000 0.250001 0.500000
-v -0.500000 0.250001 0.500000
-v -0.500000 0.374999 -0.500000
-v 0.500000 0.374999 -0.500000
-v 0.500000 0.374999 0.500000
-vt 1.000000 1.000000
-vt 0.500000 1.000000
-vt 0.500000 0.687500
-vt 1.000000 0.687500
-vt 0.000000 1.000000
-vt 0.000000 0.687500
-vt 0.500000 0.375000
-vt 1.000000 0.375000
-vt 0.000000 0.187500
-vt 0.500000 0.187500
-vt 1.000000 0.125000
-vt 0.000000 0.125000
-vt 0.000000 0.000000
-vt 1.000000 0.000000
-vt -0.000000 0.750000
-vt -0.000000 0.625000
-vt 1.000000 0.625000
-vt 1.000000 0.750000
-vt -0.000000 0.875000
-vt 1.000000 0.875000
-vn -1.000000 0.000000 0.000000
-vn 0.000000 0.000000 -1.000000
-vn 1.000000 0.000000 0.000000
-vn 0.000000 0.000000 1.000000
-vn 0.000000 -1.000000 0.000000
-vn 0.000000 1.000000 0.000000
-g Cylinder_Cylinder_main
+v -0.5 -0.5 0.5
+v -0.5 -0.5 -0.5
+v 0.5 -0.5 -0.5
+v 0.5 -0.5 0.5
+v -0.5 0.125 0.5
+v -0.5 0.125 -0.5
+v 0.5 0.125 -0.5
+v 0.5 0.125 0.5
+v -0.5 0.125 0.5
+v -0.5 0.125 -0.5
+v 0.5 0.125 -0.5
+v 0.5 0.125 0.5
+v -0.5 0.5 0.5
+v -0.5 0.5 -0.5
+v 0.5 0.5 -0.5
+v 0.5 0.5 0.5
+v -0.5 0.375 0.5
+v -0.5 0.25 -0.5
+v 0.5 0.25 -0.5
+v 0.5 0.25 0.5
+v -0.5 0.25 0.5
+v -0.5 0.375 -0.5
+v 0.5 0.375 -0.5
+v 0.5 0.375 0.5
+vt 1 1
+vt 0.5 1
+vt 0.5 0.688
+vt 1 0.688
+vt 0 1
+vt 0 0.688
+vt 0.5 0.375
+vt 1 0.375
+vt 0 0.188
+vt 0.5 0.188
+vt 1 0.125
+vt 0 0.125
+vt 0 0
+vt 1 0
+vt 0 0.75
+vt 0 0.625
+vt 1 0.625
+vt 1 0.75
+vt 0 0.875
+vt 1 0.875
+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 6/2/2 7/5/2 3/6/2 2/3/2
@@ -59,7 +56,7 @@ f 7/1/3 8/2/3 4/3/3 3/4/3
 f 8/4/4 5/3/4 1/7/4 4/8/4
 f 1/6/5 2/9/5 3/10/5 4/3/5
 f 8/10/6 7/3/6 6/6/6 5/9/6
-g Cylinder_Cylinder_glass-tb
+g 2
 f 21/11/1 18/12/1 10/13/1 9/14/1
 f 18/11/2 19/12/2 11/13/2 10/14/2
 f 19/11/3 20/12/3 12/13/3 11/14/3