Newbie questions.

Unity Engine
1

I got 3d objects- lats say rocks. Imported into scene. Placed well above terrain. I want them to fall down just like main character of Island/GI demos falling if you place him in the air. Notice that character stays on surface when he reach it. Same with herons from Island demo. How could I do that?
I thought I had to generate collides, but object not falling at the first place, not sure if it stay on terrain if it start falling.

Second question.
I read Unity - Manual: Prefabs but it seems not to address my question. In Island demo there nothing tree related in Hierarchy. And only one folder per tree in the Project window(Terrain Demo Assets —> Trees Ambient-Occlusion). But lots of trees in the scene. How do I place multiple instances of objects I imported into scene? Lets say same rocks from the question above? I could just create multiple objects in Hierarchy. But how trees and rocks are supposed to be done properly?

2

colliders are the first step (ensure its either a basic collider or if mesh, then convex or it won’t work), the second thing thats required is a rigidbody so it becomes a physically dynamic object

Question is do you really need the falling. if getting onto terrain is all then select the object, press W, then press Ctrl + shift (cmd + shift) at the same time and drag the middle “white rect” of the object gizmo around and the object will snap to surface :slight_smile:

3

Thank you dreamora.