# Blender
## 匯入.obj
1. 最上層File
2. Import
3. Wavefront (.obj)
## 匯出.obj
1. 最上層File
2. Export
3. Wavefront (.obj)
4. 勾選
1. UV Coordinates (保留UV座標)
2. Normals (保留法向量)
3. Triangulated Mesh (所有網格均為三角形)
## 將物體置中
1. 最上層Layout
2. Object Mode
3. Object
4. Set Origin
5. Geometry to Origin
## 智慧UV投影
1. 最上層Shading
2. Edit Mode
3. 第二層UV
4. 按A選取整個物體
5. Smart UV Project
6. 最上層UV Editing(確認UV投影結果)
## 將物體最大半徑設為1

import math

import bpy
from bpy import context

context.scene.cursor.location = [0.0, 0.0, 0.0]
bpy.ops.object.rotation_clear(clear_delta=False)
bpy.ops.object.location_clear(clear_delta=False)
bpy.ops.object.scale_clear(clear_delta=False)

obj = context.active_object
v = obj.data.vertices

highest = [v[0].co[0], v[0].co[1], v[0].co[2]]
lowest = [v[0].co[0], v[0].co[1], v[0].co[2]]
radius = 0.0

for v in obj.data.vertices:
    c = v.co

    if c[0] > highest[0]:
        highest[0] = c[0]

    if c[0] < lowest[0]:
        lowest[0] = c[0]

    if c[1] > highest[1]:
        highest[1] = c[1]

    if c[1] < lowest[1]:
        lowest[1] = c[1]

    if c[2] > highest[2]:
        highest[2] = c[2]

    if c[2] < lowest[2]:
        lowest[2] = c[2]

    radius = max(radius, c[0] * c[0] + c[1] * c[1] + c[2] * c[2])


bpy.ops.transform.translate(
    value=(-0.5 * (highest[0] + lowest[0]), -0.5 * (highest[1] + lowest[1]), -0.5 * (highest[2] + lowest[2])),
    orient_type='GLOBAL',
    orient_matrix=((1, 0, 0), (0, 1, 0), (0, 0, 1)),
    orient_matrix_type='GLOBAL',
    mirror=True,
    use_proportional_edit=False,
    proportional_edit_falloff='SMOOTH',
    proportional_size=1,
    use_proportional_connected=False,
    use_proportional_projected=False
)

bpy.ops.object.origin_set(type='ORIGIN_CURSOR', center='MEDIAN')

size = [highest[0] - lowest[0], highest[1] - lowest[1], highest[2] - lowest[2]]

#s = 2 / sorted(size)[2]
s = 1 / math.sqrt(radius)

bpy.ops.transform.resize(
    value=(s, s, s),
    orient_type='GLOBAL',
    orient_matrix=((1, 0, 0), (0, 1, 0), (0, 0, 1)),
    orient_matrix_type='GLOBAL',
    mirror=True,
    use_proportional_edit=False,
    proportional_edit_falloff='SMOOTH',
    proportional_size=1,
    use_proportional_connected=False,
    use_proportional_projected=False
)

###### tags: `blender` `uv coordinate`