How to add decal to a game object?

Questions & Answers
1

I’m trying to leave marks on trees when I hit them with an axe.
I tried instantiating a quad on a place of raycast hit, but this has a problem that the hit point is a physics body point, abd this does not match model/mesh, so they float in air.

I need some way to draw directly on a model following its topology.

2

You need to create a collider simulating the mesh structure. It has to be similar if not it will float.