This add-on adds triangular blocks to your world. They use a custom geometry so they can do this. The add-on's name is from the word in tagalog that translates to "triangle".
Select version for changelog:
Added more tatsulok blocks
Copper variants (except waxed ones)
Cracked nether bricks
Fixed Tatsulok planks drops
Combined all three orientations (you place them like pistons now)
All blocks can depend on texture packs