Circle From Line Renderer From http://stackoverflow.com/questions/13708395/unity-3d-draw-circle

Circle_unity

float theta_scale = 0.1;             //Set lower to add more points
int size = (2.0 * PI) / theta_scale; //Total number of points in circle.

LineRenderer lineRenderer = gameObject.AddComponent<LineRenderer>();
lineRenderer.material = new Material(Shader.Find("Particles/Additive"));
lineRenderer.SetColors(c1, c2);
lineRenderer.SetWidth(0.2F, 0.2F);
lineRenderer.SetVertexCount(size);

int i = 0;
for(float theta = 0; theta < 2 * PI; theta += 0.1) {
    x = r*cos(theta);
    y = r*sin(theta);

    Vector3 pos = new Vector3(x, y, 0);
    lineRenderer.SetPosition(i, pos);
    i+=1;
}

4 years ago... but still life saving.. cheers buddy!