0733.md

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- oeasy Python 0733
- 这是 oeasy 系统化 Python 教程，从基础一步步讲，扎实、完整、不跳步。愿意花时间学，就能真正学会。
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	- GitHub： `https://github.com/overmind1980/oeasy-python-tutorial` 
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• 添加100个采样点

import bpy

bpy.ops.object.select_all(action="SELECT")
bpy.ops.object.delete()
for mesh in bpy.data.meshes:
    bpy.data.meshes.remove(mesh)


mesh = bpy.data.meshes.new('sine wave')

sample = 100
mesh.vertices.add(sample)
mesh.edges.add(sample - 1)
for i in range(sample):
    current_vertex = mesh.vertices[i]
    current_vertex.co = (0, i, 1)

obj = bpy.data.objects.new('sine wave',mesh)
bpy.context.collection.objects.link(obj)

• 看不到这些点

连线

• 把100个点
  • 连成99个线段

import bpy

bpy.ops.object.select_all(action="SELECT")
bpy.ops.object.delete()
for mesh in bpy.data.meshes:
    bpy.data.meshes.remove(mesh)


mesh = bpy.data.meshes.new('sine wave')

sample = 100
mesh.vertices.add(sample)
mesh.edges.add(sample - 1)
for i in range(sample):
    current_vertex = mesh.vertices[i]
    current_vertex.co = (0, i, 1)

obj = bpy.data.objects.new('sine wave',mesh)
bpy.context.collection.objects.link(obj)

添加修改器

• 选中mesh
  • 添加修改器
  • skin

• 观察效果

• 找到代码

import bpy

bpy.ops.object.select_all(action="SELECT")
bpy.ops.object.delete()
for mesh in bpy.data.meshes:
    bpy.data.meshes.remove(mesh)


mesh = bpy.data.meshes.new('sine wave')

sample = 100
mesh.vertices.add(sample)
mesh.edges.add(sample - 1)
for i in range(sample):
    current_vertex = mesh.vertices[i]
    current_vertex.co = (0, i, 1)
    if i < sample -1 :
        mesh.edges[i].vertices = (i, i+1)

obj = bpy.data.objects.new('sine wave',mesh)
bpy.context.collection.objects.link(obj)
obj.modifiers.new(type="SKIN",name="skin")

设置曲线

• length 整体长度
• height 振幅
• sample 采样数字
• step 步长

import bpy
import math

bpy.ops.object.select_all(action="SELECT")
bpy.ops.object.delete()
for mesh in bpy.data.meshes:
    bpy.data.meshes.remove(mesh)

mesh = bpy.data.meshes.new('sine wave')

sample = 500
length = 30
height = 3
step = length / sample

mesh.vertices.add(sample)
mesh.edges.add(sample - 1)
for i in range(sample):
    value = i * step
    current_vertex = mesh.vertices[i]
    current_vertex.co = (0, value, height * math.sin(value))
    if i < sample -1 :
        mesh.edges[i].vertices = (i, i+1)

obj = bpy.data.objects.new('sine wave',mesh)
bpy.context.collection.objects.link(obj)
obj.modifiers.new(type="SKIN",name="skin")

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