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RiggedSimple glTF conversion
Andreas Plesch edited this page Dec 14, 2018
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35 revisions
RiggedSimple at https://github.com/KhronosGroup/glTF-Sample-Models/tree/master/2.0/RiggedSimple includes skeletal animation in a simple manner. The example was originally created in Blender, then exported as Collada and converted to glTF with collada2gltf.
To make manual porting easier, the glTF was cleaned from redundant and no-op animation content: https://github.com/andreasplesch/glTF-Sample-Models/tree/simpleRiggedSimple/2.0/RiggedSimple/glTF
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0.00058 1.00000 0.00258 0.00000
-0.00000 -0.00682 0.02796 1.00000 '
skinCoordIndex=' 2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,55,57,59,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95'
skinCoordWeight=' 0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,0.26140,1.00000,1.00000,1.00000,1.00000,1.00000,1.00000,1.00000,0.26140,1.00000,1.00000,1.00000,1.00000,1.00000,1.00000,1.00000,1.00000,1.00000,1.00000,1.00000,1.00000,1.00000,1.00000,1.00000,1.00000,1.00000,1.00000,1.00000,1.00000,1.00000,1.00000,1.00000,1.00000,1.00000'/>
</HAnimJoint>
</HAnimJoint>
</HAnimJoint>
<Group containerField='skin'>
<Shape DEF='skinMesh'>
<Appearance>
<Material diffuseColor='
0.27963539958000185
0.6399999856948853
0.21094389259815217' transparency='0.0'/>
</Appearance>
<IndexedTriangleSet solid='true' ccw='false' index='
0 1 2 1 3 4 3 5 6 5 7 8 7 9 10 9 11 12 11 13 14 13 15 16 15 17 18 17 19 20 19 21 22 21 23 24 23 25 26 25 27 28 27 29 30 29 31 32 31 33 34 33 35 36 35 37 38 37 39 40 39 41 42 41 43 44 43 45 46 45 47 48 48 47 49 50 49 51 52 51 53 53 54 55 54 56 57 56 58 59 35 19 51 60 0 61 58 60 62 63 64 65 59 62 66 62 61 67 57 59 68 55 57 69 70 55 71 52 70 72 50 52 73 48 50 74 46 48 75 44 46 64 42 44 76 40 42 77 38 40 78 36 38 79 34 36 80 32 34 81 30 32 82 28 30 63 26 28 83 24 26 84 22 24 85 20 22 86 18 20 87 16 18 88 14 16 89 12 14 65 10 12 90 8 10 91 6 8 92 4 6 93 2 4 94 61 2 95 61 0 2 2 1 4 4 3 6 6 5 8 8 7 10 10 9 12 12 11 14 14 13 16 16 15 18 18 17 20 20 19 22 22 21 24 24 23 26 26 25 28 28 27 30 30 29 32 32 31 34 34 33 36 36 35 38 38 37 40 40 39 42 42 41 44 44 43 46 46 45 48 50 48 49 52 50 51 70 52 53 70 53 55 55 54 57 57 56 59 3 1 0 0 60 3 58 56 54 54 53 51 51 49 47 47 45 51 43 41 39 39 37 35 35 33 31 31 29 27 27 25 23 23 21 19 19 17 15 15 13 19 11 9 7 7 5 3 3 60 58 58 54 51 51 45 43 43 39 35 35 31 19 27 23 19 19 13 11 11 7 3 3 58 51 51 43 35 31 27 19 19 11 3 3 51 19 62 60 61 59 58 62 66 67 95 95 94 93 93 92 91 91 90 65 65 89 88 88 87 65 86 85 63 84 83 63 63 82 79 81 80 79 79 78 77 77 76 64 64 75 74 74 73 64 72 71 69 69 68 66 66 95 65 93 91 65 65 87 86 85 84 63 82 81 79 79 77 64 64 73 72 72 69 64 95 93 65 65 86 63 63 79 64 64 69 66 66 65 64 68 59 66 66 62 67 69 57 68 71 55 69 72 70 71 73 52 72 74 50 73 75 48 74 64 46 75 76 44 64 77 42 76 78 40 77 79 38 78 80 36 79 81 34 80 82 32 81 63 30 82 83 28 63 84 26 83 85 24 84 86 22 85 87 20 86 88 18 87 89 16 88 65 14 89 90 12 65 91 10 90 92 8 91 93 6 92 94 4 93 95 2 94 67 61 95
'>
<Coordinate USE='SKINCOORD'/>
<Normal vector='
0.00000 -0.76464 -0.64446
0.14915 -0.74996 -0.64445
0.19471 -0.97902 0.06000
0.29262 -0.70644 -0.64445
0.38198 -0.92222 0.06000
0.42480 -0.63579 -0.64445
0.55457 -0.82997 0.06000
0.54069 -0.54069 -0.64445
0.70583 -0.70583 0.06000
0.63579 -0.42480 -0.64445
0.82997 -0.55457 0.06000
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0.92222 -0.38198 0.06000
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0.97902 -0.19474 0.06000
0.76465 0.00000 -0.64444
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0.97902 0.19474 0.06000
0.70644 0.29262 -0.64445
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0.55457 0.82997 0.06000
0.29262 0.70644 -0.64445
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0.19471 0.97902 0.06000
0.00000 0.76464 -0.64446
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-0.42479 0.63577 -0.64447
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-0.97902 0.19471 0.06000
-0.76463 0.00000 -0.64447
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-0.97902 -0.19474 0.06000
-0.70644 -0.29262 -0.64445
-0.92222 -0.38198 0.06000
-0.63577 -0.42479 -0.64447
-0.54069 -0.54069 -0.64445
-0.70582 -0.70585 0.06000
-0.42480 -0.63579 -0.64445
-0.55457 -0.82997 0.06000
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-0.14915 -0.74996 -0.64445
0.00000 -0.99820 0.06000
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0.14143 0.71101 0.68882
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0.00000 -0.72494 0.68881
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0.14143 -0.71101 0.68882 '/>
</IndexedTriangleSet>
</Shape>
</Group>
<!-- top-level joint references -->
<HAnimJoint USE='glTFrootnode' containerField='joints'/>
<HAnimJoint USE='node_2' containerField='joints'/>
<HAnimJoint USE='node_2_IBM' containerField='joints'/>
<HAnimJoint USE='node_3' containerField='joints'/>
<HAnimJoint USE='node_3_IBM' containerField='joints'/>
</HAnimHumanoid>
</Transform>
<TimeSensor DEF='ani0clock' cycleInterval='2' loop='true'/>
<OrientationInterpolator DEF='ani0rotator' key='0 0.5 1'
keyValue='
-0.9901418, 0, -0.1400688, 6.2790445
0.9999995, -0.0003068, -0.0009544, 5.6876664
-0.9901418, 0, -0.1400688, 6.2790445'/>
<ROUTE fromNode='ani0clock' fromField='fraction_changed' toNode='ani0rotator' toField='set_fraction'/>
<ROUTE fromNode='ani0rotator' fromField='value_changed' toNode='node_3' toField='set_rotation'/>
</Scene>see http://andreasplesch.github.io/Library/Models/HAnim/glTF/RiggedSimple.html
In glTF, each vertex index is affected by all joints. Many joints may have a 0 weight for a vertex. So all indices need to be listed in skinCoordIndex for a joint. It is possible to optimize by omitting those indices which have a 0 weight.
- combine joint ids, weights and vertex indices into triplets and all into a single list
- filter out triplets which use joint 0 and which have a non zero weight
- split filtered triplet into index list and weight list
In glTF, the weights are listed per vertex in the same order as the joints are listed. So if a vertex has a '1 0 0 0' Joint_0 value and a '0.25 0.75 0 0' Weight_0 value, joint 0 has a weight of 0.75 and joint 1 has weight of 0.25. Therefore it is necessary to look up each weight for the skinCoordWeight field.
W0=`1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
0.73860 0.26140 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000
1.00000 0.00000 0.00000 0.00000 `;
WFlat=W0.trim().split(/\s+/);
J0 = ` 0 0 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 0 0 0
0 1 0 0
0 1 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
0 1 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0
1 0 0 0 `;
JFlat=J0.trim().split(/\s+/);
JWIFlat = JFlat.map((v,i) => ( {'joint': v, 'weight': WFlat[i], 'index': (i-i%4)/4} ));
JWI = [];
JWI[0] = JWIFlat.filter( v => v.joint == 0 && v.weight != 0 );
JWI[1] = JWIFlat.filter( v => v.joint == 1 && v.weight != 0 );
skinCoordIndex = [];
skinCoordIndex[0] = JWI[0].map(v => v.index);
skinCoordIndex[1] = JWI[1].map(v => v.index);
skinWeights = [];
skinWeights[0] = JWI[0].map(v => v.weight);
skinWeights[1] = JWI[1].map(v => v.weight);