Instantiating GameObject On The Surface Of Another GameObject On Tap

[Crimson_Silk]

Hi,

I’m working on an Android application in Unity and I want to be able to instantiate a 3D object (such as a sphere) on the surface of another 3D model. The object should be attached to the models surface where the user has tapped. How would I go about this?

To sum up. This is the behaviour I want:

1: 3D Model.
2: User taps on model.
3: Sphere attaches itself to model at location of tap.
4: When model rotates (X, Y, and Z) attached spheres rotate with it.

I can instantiate a sphere on the model on tap as a child object but I can’t work out how to get the object to instantiate on the surface of the 3D model/mesh.

I have my 3D model inside an empty GameObject so I can change its pivot point and use a box collider for input if that helps. The empty object is rotated to turn the model instead of the model itself.

[mgear]

use raycast, to get tap location (and surface normal direction) on the 3d models mesh collider

Unity - Scripting API: Physics.Raycast

then can instantiate object on that hit point, and align to surface

Character align to surface normal ???

D'oh. I forgot the raycasting part. Here, try this instead: var hit : RaycastHit; var castPos = Vector3(transform.position.x,transform.position.y-.25,transform.position.z); if (Physics.Raycast (castPos, -transform.up, hit)) { transform.rotation = Quaternion.FromToRotation (Vector3.up, hit.normal); }

[Crimson_Silk]

Thanks, all working now.