def create_hexagon(radius):
""" Creates a hexagon shape that is centered at (0,0,0) with the corners having a distance of radius to the center and
the normals pointing in direction (0,-1,0).
Returns the tuple (PandaNode, GeomVertexData). """
format = GeomVertexFormat.getV3n3c4t2()
vdata=GeomVertexData('hexagon', format, Geom.UHStatic)
vertex=GeomVertexWriter(vdata, 'vertex')
normal=GeomVertexWriter(vdata, 'normal')
# create the vertices
vertex.addData3f(0,0,0)
normal.addData3f(0,-1,0)
# add the other vertices
for phi in range(0,360,60):
# right-hand-rule (with middle finger pointing upwards): the y-axis points towards the screen,
# therefore the hexagon will be created in the x,z plane, with x-axis pointing to the right
# and the z-axis pointing up
# get the next vertex coordinates by rotating the point (0,0,radius) in the x,z plane
x,z = rotate_phi_degrees_counter_clockwise(phi, (0,radius))
#print (x,z)
vertex.addData3f(x,0,z)
normal.addData3f(0,-1,0) # the normal vector points away from the screen
# add the vertices to a geometry primitives
prim = GeomTrifans(Geom.UHStatic)
for i in range(7):
prim.addVertex(i)
prim.addVertex(1)
prim.closePrimitive()
geom = Geom(vdata)
geom.addPrimitive(prim)
hex_node = GeomNode('')
hex_node.addGeom(geom)
return hex_node, vdata
def create_hexagon(radius):
""" Creates a hexagon shape that is centered at (0,0,0) with the corners having a distance of radius to the center and
the normals pointing in direction (0,-1,0).
Returns the tuple (PandaNode, GeomVertexData). """
format = GeomVertexFormat.getV3n3c4t2()
vdata=GeomVertexData('hexagon', format, Geom.UHStatic)
vertex=GeomVertexWriter(vdata, 'vertex')
normal=GeomVertexWriter(vdata, 'normal')
# create the vertices
vertex.addData3f(0,0,0)
normal.addData3f(0,-1,0)
# add the other vertices
for phi in range(0,360,60):
# right-hand-rule (with middle finger pointing upwards): the y-axis points towards the screen,
# therefore the hexagon will be created in the x,z plane, with x-axis pointing to the right
# and the z-axis pointing up
# get the next vertex coordinates by rotating the point (0,0,radius) in the x,z plane
x,z = rotate_phi_degrees_counter_clockwise(phi, (0,radius))
#print (x,z)
vertex.addData3f(x,0,z)
normal.addData3f(0,-1,0) # the normal vector points away from the screen
# add the vertices to a geometry primitives
prim = GeomTrifans(Geom.UHStatic)
for i in range(7):
prim.addVertex(i)
prim.addVertex(1)
prim.closePrimitive()
geom = Geom(vdata)
geom.addPrimitive(prim)
hex_node = GeomNode('')
hex_node.addGeom(geom)
return hex_node, vdata
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
