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June 07, 2011

from_pydata a wave wrapping around a circle


import bpy
import math
from math import sin, radians, pi
from mathutils import Vector, Euler

# variables
z_float = 0.0
amp = 0.1
profile_radius = 1.0
n_petals = 14
n_verts = n_petals * 12
section_angle = 360.0 / n_verts
position = (2*(math.pi/(n_verts/n_petals)))

# consumables
Verts = []
Edges = []

# makes vertex coordinates
for i in range(n_verts):
# difference is a function of the position on the circumference
difference = amp * math.cos(i*position)
arm = profile_radius + difference
ampline = Vector((arm, 0.0, 0.0))

rad_angle = math.radians(section_angle*i)
myEuler = Euler((0.0, 0.0, rad_angle),'XYZ')

# changes the vector in place and because successive calls are accumulative
# we reset at the start of the loop.
ampline.rotate(myEuler)
x_float = ampline.x
y_float = ampline.y
Verts.append((x_float, y_float, z_float))

# makes edge keys
for i in range(n_verts):
if i == n_verts-1:
Edges.append([i, 0])
break
Edges.append([i, i+1])

# turns mesh into object and adds object to scene
profile_mesh = bpy.data.meshes.new("Base_Profile_Data")
profile_mesh.from_pydata(Verts, Edges, [])
profile_mesh.update()

profile_object = bpy.data.objects.new("Base_Profile", profile_mesh)
profile_object.data = profile_mesh

scene = bpy.context.scene
scene.objects.link(profile_object)
profile_object.select = True


if you add this:

difference = amp * math.cos(i*position)
if difference > 0:
difference = difference * .2

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