Prisms in GDTG are part of the Wheel and in particular, they are inside of what is called a Wheel Slot. Prisms definitions in GDTF allow precise definition of each of the prism facet and it is done by using transformations represented by Rotation matrices. There are many resources on rotation matrixes, for example this Wikipedia article and also many game engine related tutorials and articles, like this one, which is useful for our 2D prism definitions. In the GDTF Builder, there is a reall