Z-axis codes!

from direct.showbase.ShowBase import ShowBase
from pandac.PandaModules import *
from math import sin, cos, pi

def move_forwards(rotation, multi):
    # Calculate Change
    x_movement=-sin(rotation*(pi/180))*multi
    z_movement=cos(rotation*(pi/180))*multi

    return Vec3(x_movement,0,z_movement)

# World Class
class World():
    def __init__(self,showbase,num_sides,radius):
        # generate n gon for platform
        n_gon=self.create_world(num_sides,radius)
        self.world=render.attachNewNode(n_gon)

        # this part sets up the texturing
        self.proj = render.attachNewNode(LensNode('proj'))
        self.lens = OrthographicLens()
        self.lens.setFilmSize(250) # not sure exactly what this was :S
        self.proj.node().setLens(self.lens)
        self.proj.reparentTo(render)
        # sets projection to be straight down from above the circle
        self.proj.setPos(0,1,0)
        self.proj.lookAt(0,0,0)

        # your texture
        self.tex = loader.loadTexture('ground.png')
        self.ts = TextureStage('ts')
        self.world.clearTexture()
        # apply it!
        self.world.projectTexture(self.ts, self.tex, self.proj)

    def create_world(self,n,radius):
        points={}

        # rotation between each warlock for even spacing
        rotation=360.0/n

        for i in range(n):
            # adjust rotation for this point
            rot=rotation*(i+1)

            # set its position radius units from center
            points[i]=move_forwards(rot,radius)

        nnode=GeomNode('n_gon')
        for i in range(n):
            triangle=self.create_triangle(points[i],points[(i+1)%n])
            nnode.addGeom(triangle)

        return nnode

    def create_triangle(self,point1,point2):
        format=GeomVertexFormat.getV3n3cpt2()
        vdata=GeomVertexData('triangle', format, Geom.UHStatic)

        vertex=GeomVertexWriter(vdata, 'vertex')
        normal=GeomVertexWriter(vdata, 'normal')
        color=GeomVertexWriter(vdata, 'color')
        texcoord=GeomVertexWriter(vdata, 'texcoord')

        # first point
        vertex.addData3f(point1.getX(), 0, point1.getZ())
        normal.addData3f(0, -1, 0)
        color.addData4f(1, 1, 1, 1)
        texcoord.addData2f(1, 0)

        # second point
        vertex.addData3f(point2.getX(), 0, point2.getZ())
        normal.addData3f(0, -1, 0)
        color.addData4f(1, 1, 1, 1)
        texcoord.addData2f(1, 1)

        # center point (0,0,0)
        vertex.addData3f(0, 0, 0)
        normal.addData3f(0, 0, 1)
        color.addData4f(1, 1, 1, 1)
        texcoord.addData2f(0, 1)

        tri1=GeomTriangles(Geom.UHStatic)

        tri1.addVertex(0)
        tri1.addVertex(1)
        tri1.addVertex(2)

        tri1.closePrimitive()

        triangle=Geom(vdata)
        triangle.addPrimitive(tri1)

        return triangle

class Main(ShowBase):
    def __init__(self):
        ShowBase.__init__(self)
        self.world=World(self,160,25)

game = Main()
game.run()