Why mesh have multiple identifiers ?

Each drawable has an "id" property composed of 4 number values for 4 channels.
The first channel (r) is for mesh identification.
The second channel (g) is for decals group.
The three channel (b) is for lights group.
The last channel is a bit-mask value for post-process effects.

Usagergba
--------------------
Identifiern
Decals groupn
Light groupn
Pixelation1
Color limit2
Dithering4
Outline8
Shadow vol16

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