blender python script 清除约束时保持变换的方法

万幸，官方的约束操作是 python 代码，不是 c++。并且能直接在 blender 安装目录里面找到。

路径，你可以参照以下路径格式找到你自己的blender版本的约束代码的位置
blender3.2的安装目录\3.2\scripts\startup\bl_operators\constraint.py
在第 71 行 CONSTRAINT_OT_disable_keep_transform

代码内容，非常简单。把姿态矩阵转换到世界矩阵，然后禁用约束，然后把世界矩阵再转换回姿态矩阵，再直接覆写回原来的姿态矩阵，对象的平移，旋转，缩放会自动计算出来。

下面官方的原始代码

# This works most of the time, but when there are multiple constraints active
# there could still be one that overrides the visual transform.
#
# Note that executing this operator and then increasing the constraint
# influence may move the object; this happens when the constraint is
# additive rather than replacing the transform entirely.

# Get the matrix in world space.
is_bone_constraint = context.space_data.context == 'BONE_CONSTRAINT'
ob = context.object
if is_bone_constraint:
    bone = context.pose_bone
    mat = ob.matrix_world @ bone.matrix
else:
    mat = ob.matrix_world

context.constraint.influence = 0.0

# Set the matrix.
if is_bone_constraint:
    bone.matrix = ob.matrix_world.inverted() @ mat
else:
    ob.matrix_world = mat
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23