How to add decals to terrain texture?

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as above

1 Answer

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If it’s the standard Unity terrain, it’s better to create a plane with the desired decal and place it slightly in front of the point it should appear. A common case is when you shot with raycast and want to place a bullet hole where the target was hit (weapon script):

var holeDecal: GameObject;

function Update(){
  if (Input.GetButtonDown("Fire1")){
    var hit: RaycastHit;
    if (Physics.Raycast(transform.position, transform.forward, hit)){
      // calculate rotation to align decal's up direction to the surface normal:
      var rot = Quaternion.FromToRotation(Vector3.up, hit.normal);
      // calculate position a little ahead the hit point: 
      var pos = hit.point + 0.001 * hit.normal;
      // create the hole decal:
      Instantiate(holeDecal, pos, rot);
    }
  }
}