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How can I draw on a Gameobject?


For reference I am using the emulator:

I want the user to be able to draw on a Gameobject with their hand. Currently I have manipulation and navigation events hooked up and they are firing when the GameObject is focused. I can draw on the objects texture by hardcoding some values (a & b below) but I want the user to be able to use a gesture to drawn on the object where their hand is pointed. How do I get the coordinates of where the user's hand is pointed and how do I translate these coordinates to the objects surface?

Current Code:

void PerformNavigationStart(Vector3 position)
Renderer rend = gameObject.transform.GetComponent();

        tex = rend.material.mainTexture as Texture2D;

    void PerformNavigationUpdate(Vector3 position)
        if (GestureManager.Instance.IsNavigating)
            if (tex != null)
                //This code draws a diagonal line on a square face of the Gameobject
                tex.SetPixel((int)a, (int)b, Color.white);
                a += 1;
                b += 1;


    void PerformNavigationCompleted(Vector3 position)


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