Question by Kajamaz · Jan 23, 2017 at 01:01 PM · script.codepage turn

How to place an object on terrain without turning it?

I'm not very good at coding, but is there a way to write a small script so that when I place an item, say a house on terrain, I wouldn't have to always adjust and keep estimating what angle it should be on the terrain when already placed, and it requires a huge amount of time spent. I want it to be automatically allign to the terrain! If you can help, I would appreciate it!

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TreyH · Jan 23, 2017 at 07:10 PM 0

When you get a RaycastHit object, it includes the outward normal of that Raycast. You can use this to get started.

The end result looks something like this. (gif)

 void Update ()
 {
     if ( Input.Get$$anonymous$$ouseButton (0) )
     {
         // First, check if the mouse was over an object.
         RaycastHit mouseHit;
         Ray ray = Camera.main.ScreenPointToRay (Input.mousePosition);
 
         if ( Physics.Raycast (ray, out mouseHit) )
         {
             // Visualize what's happening
             Debug.DrawLine (Camera.main.transform.position, mouseHit.point, Color.red);
             Debug.DrawRay (mouseHit.point, mouseHit.normal, Color.green);
 
             // Check that this worked.
             if ( Input.Get$$anonymous$$ouseButtonDown (1) )
             {
                 GameObject newCube = GameObject.CreatePrimitive (PrimitiveType.Cube);
 
                 // Adjust the cube, note that we're assigning its Upward normal
                 // to be that of our normal vector.
                 //
                 newCube.transform.localScale = Vector3.one / 5f;
                 newCube.transform.position = mouseHit.point;
                 newCube.transform.up = mouseHit.normal;
             }
         }
     }
 }