Matrix equality on bones do not match with python FK / IK Snaping script #117111

New Issue

Damien Monteillard · 2024-01-14T13:41:41+01:00

2024-01-14 13:41:41 +01:00

System Information
Operating system: Linux-6.1.67-gentoo-x86_64-Intel-R-_Core-TM-i7-6700K_CPU@_4.00GHz-with-glibc2.37 64 Bits, X11 UI
Graphics card: NVIDIA GeForce RTX 2070 SUPER/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 535.146.02

Blender Version
Broken: version: 4.0.2, branch: blender-v4.0-release, commit date: 2023-12-05 07:41, hash: 9be62e85b727
Worked:

Short description of error
Matrix equality on bones do not match with python FK / IK Snaping script
I need to use a bad concept of python function code to solve those equality

def execute(self, context):
    # Bad solution with bpy.ops.wm.redraw_timer with a For loop!
    for i in range(0, 18):
        IK2FK_Leg(context)
        bpy.ops.wm.redraw_timer(type='DRAW_WIN_SWAP', iterations=1)
    return {'FINISHED'}

Exact steps for others to reproduce the error
Download FK_IK_matrix_equality_bone.tar.gz
Open the file FK_IK_matrix_equality_bone.blend

With this python writing

def execute(self, context):
    IK2FK_Leg(context)
    return {'FINISHED'}

Press IK to FK Snap button
You need to press multiple times to have a good bone matrix equality.

My function should be 3 bones equality of matrix:

def IK2FK_Leg(self):
    bone_IK.matrix = bone_FK.matrix
    bone_1_IK.matrix = bone_1_FK.matrix
    bone_2_IK.matrix = bone_2_FK.matrix
    bone_3_IK.matrix = bone_3_FK.matrix

Sometimes blender crash!

If you try to choose FK to IK snap button this is the same problem.

**System Information** Operating system: Linux-6.1.67-gentoo-x86_64-Intel-R-_Core-TM-_i7-6700K_CPU_@_4.00GHz-with-glibc2.37 64 Bits, X11 UI Graphics card: NVIDIA GeForce RTX 2070 SUPER/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 535.146.02 **Blender Version** Broken: version: 4.0.2, branch: blender-v4.0-release, commit date: 2023-12-05 07:41, hash: `9be62e85b727` Worked: **Short description of error** Matrix equality on bones do not match with python FK / IK Snaping script I need to use a bad concept of python function code to solve those equality ```Py def execute(self, context): # Bad solution with bpy.ops.wm.redraw_timer with a For loop! for i in range(0, 18): IK2FK_Leg(context) bpy.ops.wm.redraw_timer(type='DRAW_WIN_SWAP', iterations=1) return {'FINISHED'} ``` **Exact steps for others to reproduce the error** Download FK_IK_matrix_equality_bone.tar.gz Open the file FK_IK_matrix_equality_bone.blend With this python writing ```Py def execute(self, context): IK2FK_Leg(context) return {'FINISHED'} ``` Press IK to FK Snap button You need to press multiple times to have a good bone matrix equality. My function should be 3 bones equality of matrix: ```Py def IK2FK_Leg(self): bone_IK.matrix = bone_FK.matrix bone_1_IK.matrix = bone_1_FK.matrix bone_2_IK.matrix = bone_2_FK.matrix bone_3_IK.matrix = bone_3_FK.matrix ``` Sometimes blender crash! If you try to choose FK to IK snap button this is the same problem.

FK_IK_matrix_equality_bone.tar.gz

21 MiB

FK_IK_matrix_equality_bone.zip

21 MiB

👀 1

Damien Monteillard added the