How do I use mesh to change drawing canvas shape?

I have no experience with mesh, but I think it can be used to reshape drawing canvas to say triangle instead of usual rectangle however I am having some trouble getting the shapes I want. Can someone help me or link a guide I can learn how to do it properly?

In the editor you can add mesh to objects and you can drag the points around to make different shapes. However I’m pretty sure when drawing to the canvas object it uses the original rectangle texture and doesn’t take into account the distorted shape.

Anyways, I think you could get what you’re after by using another sprite as a mask by utilizing blend modes.