I translated my example above to Python and C++:

• JavaScript, Canvas2D: https://plnkr.co/edit/zjYT0KTfj50MejT9?preview​
• Python, PyQt5, QPainter: https://rextester.com/FDPMLU35222​
• Python, PySide2, QPainter: https://rextester.com/YLSNG7380​
• C++, Qt5, QPainter: https://rextester.com/XEUPHQ83360

for code & demo, u need to check these out:

https://www.3dgep.com/volume-tiled-forward-shading/​

https://www.3dgep.com/forward-plus/​

it is not as general as the previous link i shared but this one still cuts the mushroom  ?

it should definitely get you coding;

u got all u need now;

all the best…