How can I create object above mouse clicked side

Questions & Answers
1

I’m not good at english. So I explain with picture.

There is a cube(3D).

If I click one side

15665-0.png

A cube is created beside mouse clicked side
15666-2.png

I worked for a week to make this but I failed. How can I make this?
I’m using java script.

2

Put a cube and a directional light into a scene and then add this script to an empty game object:

#pragma strict

function Update () {
	if (Input.GetMouseButtonDown(0)) {
		var hit : RaycastHit;
		var ray = Camera.main.ScreenPointToRay(Input.mousePosition);
		if (Physics.Raycast(ray, hit) && hit.collider.name == "Cube") {
			var v3 = hit.point - hit.transform.position;
			var v3Build = Vector3.zero;
			
			if (Vector3.Angle(hit.transform.up, v3) <= 45.0)
				v3Build = hit.transform.up;
			else if (Vector3.Angle(-hit.transform.up, v3) <= 45.0)
				v3Build = -hit.transform.up;
			else if (Vector3.Angle(hit.transform.right, v3) <= 45.0)
				v3Build = hit.transform.right;	
			else if (Vector3.Angle(-hit.transform.right, v3) <= 45.0)
				v3Build = -hit.transform.right;					
			else if (Vector3.Angle(hit.transform.forward, v3) <= 45.0)
				v3Build = hit.transform.forward;	
			else if (Vector3.Angle(-hit.transform.forward, v3) <= 45.0)
				v3Build = -hit.transform.forward;	
			
			if (v3Build != Vector3.zero) {
				var go = GameObject.CreatePrimitive(PrimitiveType.Cube);
				go.transform.position = hit.transform.position + v3Build;
				go.transform.rotation = hit.transform.rotation;
				//go.renderer.material.color = Color(Random.value, Random.value, Random.value);
			}			
		}
	}
}

If you are assured that your cubes will be axes aligned, you can simplify the logic by using world coordinates…Vector3.up instead of hit.transform.up for example. You may also want to create your cubes from a prefab rather than CreatePrimitive().