How to freely modify gameobjects?

Hi, How can i freely modify a gameobject, like if i takes a cube and fix it so it gets like a triangle

Photo how i mean

You can modify meshes in your code with Mesh functions, but that’s pretty involved. If you just need to create a triangle object, on the other hand, use a modelling program like Blender.

okey, thanks for the help

okey, thanks for the help