Weird interactions between transform.forward and quaternions

I'm trying to generate a cone out of line renderers, but i'm struggling to figure out the direction of each line. My code works perfectly when my object has a Y rotation of 0 or 180 degrees, but as it turns the cone becomes more and more flat, turning into more of a 2D shape at 90 and 270 Y rotation. Here's my code:

Code (CSharp):

1. void DrawLine (Vector3 Di, int i)
2.     {
3.         if(Physics.Raycast(gameObject.transform.position, Di, out hit, MaxLenght))
4.         {
5.             line.SetPosition(i, gameObject.transform.position);
6.             line.SetPosition(i+1, hit.point);
7.             if(hit.transform.gameObject.name=="Player" && InvisScript.isInvis==false)
8.             {
9.                 isAngry=true;
10.                 playerSpottedPosition=hit.point;
11.             }
12.         }
13.         else {
14.             line.SetPosition(i, gameObject.transform.position);
15.             line.SetPosition(i+1, transform.position + Di*MaxLenght);
16.         }
17.     }
18.  
19.     void Gen (int n)
20.     {
21.         int i;
22.         isAngry = false;
23.         for (i=0; i<n; i++) {
24.             Vector2 alpha, r;
25.             r.y = MaxR*Mathf.Cos(Mathf.Deg2Rad * i*360/n);
26.             r.x = MaxR*Mathf.Sin(Mathf.Deg2Rad * i*360/n);
27.             alpha.x = Mathf.Atan(r.x / MaxLenght) * Mathf.Rad2Deg;
28.             alpha.y = Mathf.Atan(r.y / MaxLenght) * Mathf.Rad2Deg;
29.  
30.             Vector3 Di = (Quaternion.Euler(alpha.x,alpha.y,0) * transform.forward).normalized;
31.             DrawLine(Di, 2*i);
32.         }

If I calculate the Z rotation (r.z = MaxR*Mathf.Sin(Mathf.Deg2Rad * i*360/n); alpha.z = Mathf.Atan(r.z / MaxLenght) * Mathf.Rad2Deg) I get the same problem, just 45 degrees earlier. There's something I'm missing about these axes...

 

I would approach this differently. Work out the equations for your cone in local space, i.e. relative to 0,0,0 and oriented around the +Z axis. Then just use transform.TransformPoint (to get the endpoint) or transform.TransformDirection (to get the direction) on each line, and draw that.

 

That worked! Thanks man!

 

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