I'm trying to create a map editor similar to like Valve Source 2 Hammer but i have no clue in the world how to actually do any of the mesh manipulation stuff, so if theirs anyone who would be willing to help that would be amazing! i have started on the UI and i have some of the stuff sorted out.. if you wanna help i can explain in more detail! this is a picture of what I've created so far though.
By mesh manipulation i mean moving vertices, stuff like that, think blender almost?
ArrayMesh Manipulation