| @stefan 
there is a new plugin by Zarbuz for Magicavoxel! https://github.com/Zarbuz/SchematicToVox/releases 
You can enter any image under 2048 * 2048 (4096 * 4096 will works but will be truncated)
 
Each matrix will be 126 * 126 *126 and image automatically trimed !
 
Little bad side it's line commands! So for Windows 10 : Logo windows + R and enter the following line 
if your image PNG is on the same folder (and with 255 colors max - black colors up palett are error by my fault! ;) 
C:\Users\Pilou\Downloads\SchematicToVox-v1.0\SchematicToVox.exe --i toto.png --o totovox
 
will be the same for an object format schematic (Minecraft) not yet tested but i believe there will be only one color!
 
my test with a little image of Verve! ;)
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