Collada: export bone to collada file, the transform matrix is not right #29672

New Issue

davy zhang · 2011-12-21T08:51:11+01:00

davy zhang commented

2011-12-21 08:51:11 +01:00

%%%a single bone and a single plane as the file attached.

check the transform matrix
<float_array id="Armature_Plane-skin-bind_poses-array" count="16">1 0 0 0 0 0 1 0 0 -1 0 0 0 0 0 1</float_array>
this can not make a identity matrix,

the collada content exported is :

``` Blender User Blender 2.61.0 r42614 2011-12-21T15:46:29 2011-12-21T15:46:29 Z_UP 1 1 0 1 -1 0 -1 -0.9999998 0 -0.9999997 1 0 0 0 1 4

0 0 3 0 2 0 1 0

1 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 Bone 1 0 0 0 0 0 1 0 0 -1 0 0 0 0 0 1 0.9999984 0.9999983 0.9999983 0.9999985 1 1 1 1 0 0 0 1 0 2 0 3 0 0 0 0 0 1 0 0 1 0 0 1 0 0 0 1 1 1 1 0 0 0 0 -4.37114e-8 -1 0 0 1 -4.37114e-8 0 0 0 0 1 0 0 0 0 0 1 0 0 1 0 0 1 0 0 0 1 1 1 #Bone ``` %%%

%%%a single bone and a single plane as the file attached. check the transform matrix <float_array id="Armature_Plane-skin-bind_poses-array" count="16">1 0 0 0 0 0 1 0 0 -1 0 0 0 0 0 1</float_array> this can not make a identity matrix, the collada content exported is : <?xml version="1.0" encoding="utf-8"?> <COLLADA xmlns="http://www.collada.org/2005/11/COLLADASchema" version="1.4.1"> ``` <asset> <contributor> <author>Blender User</author> <authoring_tool>Blender 2.61.0 r42614</authoring_tool> </contributor> <created>2011-12-21T15:46:29</created> <modified>2011-12-21T15:46:29</modified> <unit name="meter" meter="1"/> <up_axis>Z_UP</up_axis> </asset> <library_geometries> <geometry id="Plane-mesh"> <mesh> <source id="Plane-mesh-positions"> <float_array id="Plane-mesh-positions-array" count="12">1 1 0 1 -1 0 -1 -0.9999998 0 -0.9999997 1 0</float_array> <technique_common> <accessor source="#Plane-mesh-positions-array" count="4" stride="3"> <param name="X" type="float"/> <param name="Y" type="float"/> <param name="Z" type="float"/> </accessor> </technique_common> </source> <source id="Plane-mesh-normals"> <float_array id="Plane-mesh-normals-array" count="3">0 0 1</float_array> <technique_common> <accessor source="#Plane-mesh-normals-array" count="1" stride="3"> <param name="X" type="float"/> <param name="Y" type="float"/> <param name="Z" type="float"/> </accessor> </technique_common> </source> <vertices id="Plane-mesh-vertices"> <input semantic="POSITION" source="#Plane-mesh-positions"/> </vertices> <polylist count="1"> <input semantic="VERTEX" source="#Plane-mesh-vertices" offset="0"/> <input semantic="NORMAL" source="#Plane-mesh-normals" offset="1"/> <vcount>4 </vcount> <p>0 0 3 0 2 0 1 0</p> </polylist> </mesh> <extra><technique profile="MAYA"><double_sided>1</double_sided></technique></extra> </geometry> </library_geometries> <library_controllers> <controller id="Armature_Plane-skin" name="Armature"> <skin source="#Plane-mesh"> <bind_shape_matrix>1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1</bind_shape_matrix> <source id="Armature_Plane-skin-joints"> <Name_array id="Armature_Plane-skin-joints-array" count="1">Bone</Name_array> <technique_common> <accessor source="#Armature_Plane-skin-joints-array" count="1" stride="1"> <param name="JOINT" type="name"/> </accessor> </technique_common> </source> <source id="Armature_Plane-skin-bind_poses"> <float_array id="Armature_Plane-skin-bind_poses-array" count="16">1 0 0 0 0 0 1 0 0 -1 0 0 0 0 0 1</float_array> <technique_common> <accessor source="#Armature_Plane-skin-bind_poses-array" count="1" stride="16"> <param name="TRANSFORM" type="float4x4"/> </accessor> </technique_common> </source> <source id="Armature_Plane-skin-weights"> <float_array id="Armature_Plane-skin-weights-array" count="4">0.9999984 0.9999983 0.9999983 0.9999985</float_array> <technique_common> <accessor source="#Armature_Plane-skin-weights-array" count="4" stride="1"> <param name="WEIGHT" type="float"/> </accessor> </technique_common> </source> <joints> <input semantic="JOINT" source="#Armature_Plane-skin-joints"/> <input semantic="INV_BIND_MATRIX" source="#Armature_Plane-skin-bind_poses"/> </joints> <vertex_weights count="4"> <input semantic="JOINT" source="#Armature_Plane-skin-joints" offset="0"/> <input semantic="WEIGHT" source="#Armature_Plane-skin-weights" offset="1"/> <vcount>1 1 1 1 </vcount> <v>0 0 0 1 0 2 0 3</v> </vertex_weights> </skin> </controller> </library_controllers> <library_visual_scenes> <visual_scene id="Scene" name="Scene"> <node id="Armature" type="NODE"> <translate sid="location">0 0 0</translate> <rotate sid="rotationZ">0 0 1 0</rotate> <rotate sid="rotationY">0 1 0 0</rotate> <rotate sid="rotationX">1 0 0 0</rotate> <scale sid="scale">1 1 1</scale> <node id="Bone" name="Bone" sid="Bone" type="JOINT"> <matrix sid="transform">1 0 0 0 0 -4.37114e-8 -1 0 0 1 -4.37114e-8 0 0 0 0 1</matrix> </node> </node> <node id="Plane" type="NODE"> <translate sid="location">0 0 0</translate> <rotate sid="rotationZ">0 0 1 0</rotate> <rotate sid="rotationY">0 1 0 0</rotate> <rotate sid="rotationX">1 0 0 0</rotate> <scale sid="scale">1 1 1</scale> <instance_controller url="#Armature_Plane-skin"> <skeleton>#Bone</skeleton> </instance_controller> </node> </visual_scene> </library_visual_scenes> <scene> <instance_visual_scene url="#Scene"/> </scene> ``` </COLLADA>%%%

davy zhang commented

2011-12-21 08:51:11 +01:00

Changed status to: 'Open'

davy zhang commented

2011-12-21 08:52:04 +01:00

%%%
1 0 0 0 0 -4.37114e-8 -1 0 0 1 -4.37114e-8 0 0 0 0 1

also this transform is not quit right%%%

%%%<node id="Bone" name="Bone" sid="Bone" type="JOINT"> <matrix sid="transform">1 0 0 0 0 -4.37114e-8 -1 0 0 1 -4.37114e-8 0 0 0 0 1</matrix> </node> also this transform is not quit right%%%

kanttori commented

2012-01-07 16:12:00 +01:00

%%%Hi,

I don't have an indepth understanding of collada, but in general those matrices look ok and you should get an identity matrix if you do joint-matrix * bind-matrix. The bone has a matrix that's non-identity since it's lengthwise direction is it's local Y-axis; you can see this in pose-mode with 3d view's transform orientation set as "Gimbal".
%%%

%%%Hi, I don't have an indepth understanding of collada, but in general those matrices look ok and you should get an identity matrix if you do joint-matrix * bind-matrix. The bone has a matrix that's non-identity since it's lengthwise direction is it's local Y-axis; you can see this in pose-mode with 3d view's transform orientation set as "Gimbal". %%%

Campbell Barton commented

2012-01-30 22:44:10 +01:00

%%%Collada bugs are not being handled well so far,

for this reason they are all being set as 'TODO' and linked from our wiki page.

http://wiki.blender.org/index.php/Dev:2.5/Source/Development/Todo/Import_Export#OpenCollada%%%

%%%Collada bugs are not being handled well so far, for this reason they are all being set as \'TODO\' and linked from our wiki page. http://wiki.blender.org/index.php/Dev:2.5/Source/Development/Todo/Import_Export#OpenCollada%%%

Gaia Clary commented

2012-02-07 10:21:32 +01:00

%%%Tested with revision 43930 on a windows-7 (32 build)

I use factory settings

open Blender
export scene as is as test1.dae
remove all elements from current scene
import test1.dae

result:

1.) camera, cube and lamp are imported
2.) Camera is selected (expected cubue to be selected)
3.) a new Material appears:
3.1.) Specularity set to Phong (original was CockTorr)
3.2.) Specular color set to <0.5,0.5,0.5> (original was <1.0,1.0,1.0>)

It seems to be not defined which object will become selected
right after import. When i repeat this procedure with a fresh
Blender its always the camare that gets selected.
But if i do:

export scene
delete all objects
import scene
export scene
delete all objects
import scene

then the cube is selected.

Questions:

1.) Is it expected that the material settings change ?
2.) Can the current selection state be stored in collada at all ?
3.) Would it be an option to either select all imported objects or none of the imported objects ?%%%

%%%Tested with revision 43930 on a windows-7 (32 build) I use factory settings - open Blender - export scene as is as test1.dae - remove all elements from current scene - import test1.dae result: 1.) camera, cube and lamp are imported 2.) Camera is selected (expected cubue to be selected) 3.) a new Material appears: 3.1.) Specularity set to Phong (original was CockTorr) 3.2.) Specular color set to <0.5,0.5,0.5> (original was <1.0,1.0,1.0>) It seems to be not defined which object will become selected right after import. When i repeat this procedure with a fresh Blender its always the camare that gets selected. But if i do: - export scene - delete all objects - import scene - export scene - delete all objects - import scene then the cube is selected. **** Questions: 1.) Is it expected that the material settings change ? 2.) Can the current selection state be stored in collada at all ? 3.) Would it be an option to either select all imported objects or none of the imported objects ?%%%

Gaia Clary commented

2012-06-14 13:06:27 +02:00

%%%First check: Something wrong with the scaling of the bone after import (bone size scales down to 10 cm but 1 meter was expected)%%%