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Update Armature sources& research.txt

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keeping track of where I got what information, more or less
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Ada Radius
2020-03-13 15:50:43 -07:00
parent 07fd4e11cd
commit d4a32498ef
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Armatures/Armature sources& research.txt
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@@ -1,34 +1,3 @@
https://community.secondlife.com/forums/topic/337070-importing-a-rigged-mesh-from-maya-to-blender/
https://www.khronos.org/collada/wiki/Skinning
https://community.khronos.org/t/inverse-bind-pose-matrix-or-transformation-matrix-of-joint/6265/3
skin-bind_poses-array
you should get an identity matrix if you do joint-matrix * bind-matrix.
https://developer.blender.org/T50412
The Restpose is where all pose matrices are neutral have no influence on the skeleton and the meshes
The Bindpose is an arbitrary pose that is treated as if it where the restpose.
But Blender does not have a bind pose, or better said, In Blender the Bindpose and the Restpose are always identical.
https://docs.unity3d.com/ScriptReference/Mesh-bindposes.html
The bind pose is the inverse of the transformation matrix of the bone, when the bone is in the bind pose.
https://www.gamedev.net/forums/topic.asp?topic_id=562776&whichpage=1&#3607410
Animated COLLADA files provide the following info Skin - bind shape matrix - list of joint/weight index pairs - list of weights - list of joint nodes used during skinning - list of inverse bind matrices, one per joint and the animation channel (track) data.
https://veeenu.github.io/2014/05/09/implementing-skeletal-animation.html
for(bone in bones)
localMatrix = calculateMatrix(bone.rotation, bone.position)
if(bone is root)
bone.worldMatrix = localMatrix
else
bone.worldMatrix = bone.parent.worldMatrix * localMatrix
bone.inverseBindpose = invert(bone.worldMatrix)
bone.offsetMatrix = bone.inverseBindpose * bone.worldMatrix
https://community.secondlife.com/forums/topic/350794-collada-and-blender-leaf-bones-differences-deform-bones-and-rest-pose/
Blender manual:
The new option Keep Bind Info checks each bone for having two arrays:
@@ -37,6 +6,12 @@ The new option Keep Bind Info checks each bone for having two arrays:
Those two arrays can later be used when you want to export the rig again and be sure the original rest pose/bind pose combination must be used.
https://wiki.blender.org/wiki/Dev:Ref/Release_Notes/2.79/Add-ons
https://lists.blender.org/pipermail/bf-blender-cvs/2016-May/086767.html
https://developer.blender.org/T38660
https://developer.blender.org/T50412 2017
(Gaia Clary)
Back in 2.70 this issue was solved in a very ugly way:
@@ -61,11 +36,17 @@ So i proceed as follows now:
I add an option to the importer to "import bind pose info"
I also add a new option to the exporter "use custom bind pose"
https://developer.blender.org/T69400
https://wiki.blender.org/wiki/Dev:Ref/Release_Notes/2.79/Add-ons
https://community.secondlife.com/forums/topic/324977-liquid-democracy-new-free-and-open-source-kit-prototype-to-rig-fitted-mesh/?tab=comments#comment-1092118
https://lists.blender.org/pipermail/bf-blender-cvs/2016-May/086767.html
https://community.secondlife.com/forums/topic/337070-importing-a-rigged-mesh-from-maya-to-blender/
https://community.secondlife.com/forums/topic/350794-collada-and-blender-leaf-bones-differences-deform-bones-and-rest-pose/