# 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_wardrobe/models/homedecor_bedroom_wardrobe.obj

@@ -1,125 +1,122 @@
-# Blender v2.73 (sub 0) OBJ File: 'bedroom-wardrobe.blend'
-# www.blender.org
-o Cylinder
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-v -0.500000 -0.500000 -0.437500
-v 0.500000 -0.500000 -0.437500
-v 0.500000 -0.500000 0.500000
-v -0.500000 1.500000 0.500000
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-v 0.500000 1.500000 -0.437500
-v 0.500000 1.500000 0.500000
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-v 0.437500 -0.062500 -0.500000
-v 0.437500 -0.062500 -0.437500
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-v 0.437500 0.187500 -0.500000
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-v 0.500000 0.500000 -0.437500
-v 0.500000 0.500000 0.500000
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-vt 0.937500 1.000000
-vt 0.937500 0.750000
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+g 1
 s off
 f 53/1/1 54/2/1 2/3/1 1/4/1
 f 6/5/2 7/4/2 50/6/2 49/7/2
@@ -139,7 +136,7 @@ f 52/10/2 28/24/2 16/25/2 55/4/2
 f 40/26/2 50/6/2 55/1/2 16/27/2
 f 45/28/2 13/2/2 54/8/2 49/7/2
 f 36/29/2 16/27/2 13/2/2 41/30/2
-g Cylinder_Cylinder_drawers
+g 2
 f 13/8/1 14/31/1 10/32/1 9/33/1
 f 14/31/2 15/7/2 11/34/2 10/32/2
 f 15/7/3 16/5/3 12/35/3 11/34/3
@@ -155,7 +152,7 @@ f 30/38/2 31/40/2 27/45/2 26/43/2
 f 31/40/3 32/41/3 28/46/3 27/45/3
 f 25/47/5 26/36/5 27/37/5 28/48/5
 f 32/37/6 31/48/6 30/47/6 29/36/6
-g Cylinder_Cylinder_doors
+g 3
 f 37/49/1 38/50/1 34/51/1 33/52/1
 f 38/50/2 39/28/2 35/26/2 34/51/2
 f 39/28/3 40/3/3 36/25/3 35/26/3