Blender2.8で曲線を描く(Plot3D)

Blender

2019.11.13

この前はBlenderで面を描画するSurfacePlotをやってみました. 今回は3次元の曲線を描画するPlot3Dをやっていきます.

とはいえやることは簡単で, 下のスクリプトをダウンロードしてBlender2.8で実行するだけです.

	# This script is based on the following discussion.
	# https://blenderartists.org/t/how-do-i-create-a-simple-curve-in-python/477260/5

	import bpy
	import numpy as np
	import math
	import mathutils


	def Lissajous(t, a=1, b=2, delta=0):
	x = np.cos(a * t)
	y = np.sin(b * t + delta)
	return (x, y)


	def makeSpline(cu, typ, points):
	spline = cu.splines.new(typ)
	npoints = len(points)

	if typ == 'BEZIER' or typ == 'BSPLINE':
	spline.bezier_points.add(npoints – 1)
	for (n, pt) in enumerate(points):
	bez = spline.bezier_points[n]
	(bez.co, bez.handle1, bez.handle1_type,
	bez.handle2, bez.handle2_type) = pt
	else:
	spline.points.add(npoints – 1) # One point already exists?
	for (n, pt) in enumerate(points):
	spline.points[n].co = pt

	return

	cu = bpy.data.curves.new("MyCurve", "CURVE")
	ob = bpy.data.objects.new("MyCurveObject", cu)
	bpy.context.scene.collection.objects.link(ob)


	ps = []

	for t in np.linspace(0, 2.0 * np.pi, endpoint=True):
	x, y = Lissajous(t, a=1, b=2)
	ps.append((x, y, np.sin(t), 1))

	print(ps)
	# scn = bpy.context.scene
	# scn.objects.link(ob)
	# scn.objects.active = ob

	cu.dimensions = "3D"

	# makeSpline(cu, "NURBS", [(0, 0, 0, 1), (0, 0, 1, 1),
	# (0, 1, 1, 1), (1, 4, 1, 1)])

	makeSpline(cu, "NURBS", ps)