def makeCircle(vdata, numVertices=40, offset=Vec3(0, 0, 0), direction=1):
circleGeom = Geom(vdata)
vertWriter = GeomVertexWriter(vdata, "vertex")
normalWriter = GeomVertexWriter(vdata, "normal")
colorWriter = GeomVertexWriter(vdata, "color")
uvWriter = GeomVertexWriter(vdata, "texcoord")
drawWriter = GeomVertexWriter(vdata, "drawFlag")
#make sure we start at the end of the GeomVertexData so we dont overwrite anything
#that might be there already
startRow = vdata.getNumRows()
vertWriter.setRow(startRow)
colorWriter.setRow(startRow)
uvWriter.setRow(startRow)
normalWriter.setRow(startRow)
drawWriter.setRow(startRow)
angle = 2 * math.pi / numVertices
currAngle = angle
for i in range(numVertices):
position = Vec3(
math.cos(currAngle) + offset.getX(),
math.sin(currAngle) + offset.getY(), offset.getZ())
vertWriter.addData3f(position)
uvWriter.addData2f(position.getX() / 2.0 + 0.5,
position.getY() / 2.0 + 0.5)
colorWriter.addData4f(1.0, 1.0, 1.0, 1.0)
position.setZ(position.getZ() * direction)
position.normalize()
normalWriter.addData3f(position)
#at default Opengl only draws "front faces" (all shapes whose vertices are arranged CCW). We
#need direction so we can specify which side we want to be the front face
currAngle += angle * direction
circle = GeomTrifans(Geom.UHStatic)
circle.addConsecutiveVertices(startRow, numVertices)
circle.closePrimitive()
circleGeom.addPrimitive(circle)
return circleGeom
def makeCircle(vdata, numVertices=40,offset=Vec3(0,0,0), direction=1): circleGeom=Geom(vdata) vertWriter=GeomVertexWriter(vdata, "vertex") normalWriter=GeomVertexWriter(vdata, "normal") colorWriter=GeomVertexWriter(vdata, "color") uvWriter=GeomVertexWriter(vdata, "texcoord") drawWriter=GeomVertexWriter(vdata, "drawFlag") #make sure we start at the end of the GeomVertexData so we dont overwrite anything #that might be there already startRow=vdata.getNumRows() vertWriter.setRow(startRow) colorWriter.setRow(startRow) uvWriter.setRow(startRow) normalWriter.setRow(startRow) drawWriter.setRow(startRow) angle=2*math.pi/numVertices currAngle=angle for i in range(numVertices): position=Vec3(math.cos(currAngle)+offset.getX(), math.sin(currAngle)+offset.getY(),offset.getZ()) vertWriter.addData3f(position) uvWriter.addData2f(position.getX()/2.0+0.5,position.getY()/2.0+0.5) colorWriter.addData4f(1.0, 1.0, 1.0, 1.0) position.setZ(position.getZ()*direction) position.normalize() normalWriter.addData3f(position) #at default Opengl only draws "front faces" (all shapes whose vertices are arranged CCW). We #need direction so we can specify which side we want to be the front face currAngle+=angle*direction circle=GeomTrifans(Geom.UHStatic) circle.addConsecutiveVertices(startRow, numVertices) circle.closePrimitive() circleGeom.addPrimitive(circle) return circleGeom
