How to make a custom model

[PandaSaotome]

So I have the STL files of the objects I want to import. I can convert them into OBJ files using blender but I don't know how to make the mesh colliders or the image files. YouTube videos on making mesh colliders on Unity don't help.
So, does anyone know how to make these two?

[SaltyO]

If I were to channel CHRY, I *think* they might say that you might as well make 3D as Unity assets in Unity itself instead of importing 3d models.

I've started modeling in blender, and making model textures (is that what you mean by "image files"?) is part of basics of modeling. When you say you don't know how to "make" these things, I can't tell if you mean you don't understand what you need to import in TTS, or you don't know how to generate texture files, or you don't know how to apply textures in Blender, or you don't know how to make textures in image software like GIMP.
It sounds like you have found STL files of models somewhere online and you want to import them into the game? Need more information.

[hyperboloidbiome]

can you make that more clear please?

[CR4YCR4Y]

Hey there! Mesh colliders are only really necessary for models that will utilize physics in a meaningful way. (So like a d20 or a mancala style board) for individual minis, you should be able to get by with the automatic cube shaped colliders that Tabletop SImulator generates for you.

Tabletop Simulator doesn't require you provide any of the fields for a custom model with input except for the OBJ file itself. You can leave these fields blank.

If your model absolutely needs to be seen as a certain shape by the game's logic, You can create a lower resolution replica of your model made of primitives (like cubes and whatnot) and export that as an OBJ.

By images, I presume you mean textures. I don't think you'll really need textures for any model that is an STL file, as the format is designed for 3D printing without textures.

If your STL is particularly high in the polygon department, I recommend either using decimate in blender, or if you'd find it easier and use windows 10, simplify in the 3D builder.

[Baryonyx]

I can recommend the two guides I wrote. If anything in particular is unclear, feel free to ask:
https://steamcommunity.com/sharedfiles/filedetails/?id=903068274

https://steamcommunity.com/sharedfiles/filedetails/?id=894263479