pliant geode
I want to implement a drawing mechanic on objects, similar to what's implemented in the game SuchArt: Genius Artist Simulator - https://store.steampowered.com/app/1293180/SuchArt_Genius_Artist_Simulator
But I only want a simple mechanic for drawing with a black marker on the surfaces of various objects.
Could you please help me create such a mechanic in Unity 6.2?😄
lean imp
There’s quite a lot involved with doing this. There’s a very good chance this game was made using: https://assetstore.unity.com/packages/tools/painting/paint-in-3d-26286
If this is what you’re going for, then this package pretty much does it all. It also comes with over 100 (!) demo scenes showing how each and every component works. I’m using it in my project and have managed to easily extend it for some very sophisticated use cases specific to my game and internals.
plush grove
If you want to DIY it, the key idea is that a raycast that hits a mesh collider can tell you the UV coordinate for the point that it hit.
This lets you go over to a texture and draw on it.
Of course, this doesn't handle seams in the UV map (:
steady bronze
Make a script that can plot lines, then have it detect when input down occurs, takes that coordinate, plots the path keeping the coords in a list or array, on mouse up it stops and fills in the gaps
plush grove
oh yeah, you could also just draw lines on top of surfaces
that is dramatically simpler :p
you can use a LineRenderer for that
strange abyss
https://docs.unity3d.com/ScriptReference/RaycastHit-textureCoord.html
https://docs.unity3d.com/ScriptReference/RaycastHit-lightmapCoord.html
If you want to edit the texture directly then texturecoord (or as a texture mask with similar uvs), otherwise editing the lightmap is an idea or projecting a texture as a decal to do it for you
