   how to put polygon onto cylinder?
  I create one tree with main trunk and two-level branch realtime, every branch of the tree is drawed with cylinder.   NOw I want to put leaves on to the branch, leaf is denoted by two triangle(four-side polygon).  Will you give me some suggestin how to put four-side polygon onto 2-level branch?  My sketch tree is as follows:
  You looked at using Cylinder coordinates?   ;  "You looked at using Cylinder coordinates?"I draw tree's branch with D3DXCreateCylinder and the upper radius is different with the lower radius. Now I want to use four-side polygon to denote leaf, but I dont know how to put polygon onto the cylinder.  Any advice is greatly appreaciated.   