Making geometric meshes out of canvases is currently a bit limited. The closest you can really get is making surfaces out of canvas cubes and canvas primitives, but these are too symmetric
Since any geometric mesh can be turned into triangles, why not have a triangle canvas item? The only parameters needed to get all possible triangles are a side length and an angle, with anything less than 90° being acute and anything greater than 90° being obtuse
Also if this gets added in I may be able to do something very cool with it