I think my code failed somehow...

[The Eriksonn]

This is supposed to be a cube:

Screenshot

2017-04-10 (1).png (59.55 KiB) Viewed 1775 times

I am making my own 3d visualizer
it is seen at 70 degrees angle

works fine for rotating around left/right
but not up/down as shown

[DerivePi]

I'm thinking 2 possibilities:
- your vertices and triangles are out of order
- your vertices are not clockwise from the viewing direction