def makeCylinder(vdata,numVertices=40):
topCircleGeom=makeCircle(vdata, numVertices,Vec3(0,0, 1))
bottomCircleGeom=makeCircle(vdata, numVertices,Vec3(0,0,0),-1)
body=GeomTristrips(Geom.UHStatic)
j=40
i=0
while i < numVertices+1:
body.addVertex(i)
body.addVertex(j)
i+=1
if j==40:
j=2*numVertices-1
else:
j-=1
body.addVertex(i)
body.addVertex(j)
j-=1
i+=1
body.addVertex(numVertices-1)
body.addVertex(0)
body.addVertex(numVertices)
body.closePrimitive()
#print body
cylinderGeom=Geom(vdata)
cylinderGeom.addPrimitive(body)
cylinderGeom.copyPrimitivesFrom(topCircleGeom)
cylinderGeom.copyPrimitivesFrom(bottomCircleGeom)
cylinderGeom.decomposeInPlace()
cylinderGeom.unifyInPlace()
return cylinderGeom
