mbcp/docs/ja/api/mp_math/segment.md

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---
title: mbcp.mp_math.segment
---
### **class** `Segment3`
### *method* `__init__(self, p1: Point3, p2: Point3)`
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**説明**: 三维空间中的线段。
:param p1:
:param p2:
<details>
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<summary> <b>ソースコード</b> </summary>
```python
def __init__(self, p1: 'Point3', p2: 'Point3'):
"""
三维空间中的线段。
:param p1:
:param p2:
"""
self.p1 = p1
self.p2 = p2
'方向向量'
self.direction = self.p2 - self.p1
'长度'
self.length = self.direction.length
'中心点'
self.midpoint = Point3((self.p1.x + self.p2.x) / 2, (self.p1.y + self.p2.y) / 2, (self.p1.z + self.p2.z) / 2)
```
</details>