Tutorial - The Floor is Lava

I have imported some models I had created from Blender, with their textures, they look good

But the sphere I created inside of unity, with a rigid body constraint, is supposed to fall hit my blender created assets and roll off them, instead they fall through them and interact with 3D assets downloaded from the asset store?

When importing my own assets from blender, as .FBX, was I supposed to do something to make them interactable?

You have to add colliders to them. No colliders, no collision.

They need colliders.

There is many ways to do that in unity and in blender. Too many options to tell you what to do - but if you are making games, you got to know about colliders. So take some time to read the documentation and maybe watch some youtube videos too. “Colliders” is all you got to search. It’s easy stuff but you got to be familiar with it.

You can think of a 3d model like a ghost, but the collider is what makes it physical and real (which seems a little backwards because you see the “ghost” model, but the collider is typically invisible).

Thanks everyone very clear