title: OpenGL quad from normal
body: <p>Is possible to draw a quad given its normal vector, a point that is center of the quad and the size of the quad?</p>
  
  <p>I know the equation of a plane with normal vector n=(a,b,c)  passing through the point (x_0,y_0,z_0) is given by a(x-x_0)+b(y-y_0)+c(z-z_0)=0. (from <a href="http://mathworld.wolfram.com/NormalVector.html" rel="nofollow noreferrer">here</a>)</p>
  
  <p>But how to find the coordinate of the four vertex of the quad?</p>
  
  <p>Thanks</p>