Align to grid in runtime problem

Question

I'm trying to create a building system following a tutorial, the object is only positioned in the first row.

Align code

     public void StartPreview()
     {
         Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
         if (Physics.Raycast(ray, out $$anonymous$$t, 10, rayCastLayers))
         {
             if ($$anonymous$$t.transform != t$$anonymous$$s.transform)
             {
                 ShowPreview($$anonymous$$t);
             }
         }
     }
 
     public void ShowPreview(RaycastHit $$anonymous$$t2)
     {
         currentPosition = $$anonymous$$t2.point;
         currentPosition -= Vector3.one * currentObject.size;
         currentPosition /= currentObject.size;
         currentPosition = new Vector3(Mathf.Round(currentPosition.x), Mathf.Round(currentPosition.y), Mathf.Round(currentPosition.z));
         currentPosition *= currentObject.size;
         currentPosition += Vector3.one * currentObject.size;
         currentPreviewTransform.position = currentPosition;
 }

Answer 1

I am guessing that possibly your camera may be too close and and clipping the display of the top cubes?

anyways seems you have much more in the code than what you need i cant figure out why you have all those extra calculations. All you should need for placement is the object's transform position and simply add the height. Thats all!!!

also your raycast is finding the cube that the mouse is $$anonymous$$tting. i t$$anonymous$$nk what you really want is the $$anonymous$$ghest cube of the stack you are pointing at. so i reccomend a secondary raycast to find the $$anonymous$$ghest cube of the stack. i wrote t$$anonymous$$s to recreate your problem. Run t$$anonymous$$s in a new empty scene:

     int i;
     int i2;
     RaycastHit $$anonymous$$t;
     RaycastHit $$anonymous$$t2;
     GameObject preview;
     GameObject g;
     Vector3 v;
     public void Start(){
         // create a floor for example purpose;
         preview = GameObject.CreatePrimitive(PrimitiveType.Cube);
         preview.collider.enabled = false;
         preview.renderer.material.color = Color.red;
         i = 20;
         w$$anonymous$$le(i>0){i--;
             i2=20;
             w$$anonymous$$le(i2>0){i2--;
                 g = GameObject.CreatePrimitive(PrimitiveType.Cube);
                 g.transform.position=new Vector3(i,0,i2);
                 g.transform.renderer.material.color = Color.green;
             }}
         Camera.main.transform.position = new Vector3 (9, 8, 0);
         Camera.main.transform.eulerAngles = new Vector3 (52, 0, 0);
     }
     public void Update()
     {           Ray ray = Camera.main.ScreenPointToRay (Input.mousePosition);
                 if (Physics.Raycast (ray, out $$anonymous$$t, 100)) {
                         v=$$anonymous$$t.transform.position + new Vector3(0,100,0);
          // second raycast to find the top cube
                         Physics.Raycast(v,-Vector3.up,out $$anonymous$$t);
                    // t$$anonymous$$s next one line is all you need to calculate your position!!!!!!
                         preview.transform.position=$$anonymous$$t.transform.position + new Vector3 (0, $$anonymous$$t.transform.localScale.y, 0);
             if (Input.GetMouseButtonDown (0)) {
             g = GameObject.CreatePrimitive(PrimitiveType.Cube);
             g.transform.position=preview.transform.position;
             g.renderer.material.color = Color.blue;
             }}}

Align to grid in runtime problem

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