Difference between cube and triangle


From these images:
- Cube can't expand
- Triangle's angle doesn't match between cube
Describe the solution you'd like
Isometric triangle is the best option, because it can paint cells in a triangle level.
Describe alternatives you've considered
P3 may able to do the thing, but it's hard to figure out.
Additional context
Image created in cube has a little spoiler for a puzzle game. (Don't worry, player must reach and clear the level to proceed)
Difference between cube and triangle


From these images:
Describe the solution you'd like
Isometric triangle is the best option, because it can paint cells in a triangle level.
Describe alternatives you've considered
P3 may able to do the thing, but it's hard to figure out.
Additional context
Image created in cube has a little spoiler for a puzzle game. (Don't worry, player must reach and clear the level to proceed)