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KFbxCluster link, Please help me am very lost...

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JCAA

JCAA
Posted: 21 September 2011 04:18 AM

Total Posts: 20
Joined: 01 April 2010 05:06 PM

i am iterating the clusters in the mesh, i used a code from this forums.

void ProcessClusters(KFbxMesh *mesh)
{

 if (!mesh->GetDeformerCount()) 

 return; 

 KFbxDeformer *def = mesh->GetDeformer(0); 

 KFbxDeformer::EDeformerType defType = def->GetDeformerType(); 

 assert(defType == KFbxDeformer::eSKIN); 

 KFbxSkin *skin = KFbxCast<KFbxSkin>(def); 

 int clusterCount = skin->GetClusterCount(); 

 for (int i = 0 ; i < clusterCount ; i++) 

 { 

 KFbxCluster *cluster = skin->GetCluster(i); 

 KFbxCluster::ELinkMode lClusterMode = cluster->GetLinkMode(); 

 const char *boneName = cluster->GetLink()->GetName();

 bones[i].id = i;

 bones[i].parent_id = GetBoneIndex(cluster->GetLink()->GetParent()->GetName());

 bones[i].name = std::string(boneName);

 KFbxXMatrix kLinkMatrix; 

 cluster->GetTransformLinkMatrix(kLinkMatrix);

 KFbxXMatrix kTM; 

 cluster->GetTransformMatrix(kTM); 

 KFbxXMatrix kInvLinkMatrix(kLinkMatrix.Inverse()); 

 KFbxXMatrix kM(kInvLinkMatrix * kTM);

 int indexCount = cluster->GetControlPointIndicesCount(); 

 int *indices = cluster->GetControlPointIndices(); 

 double *weights = cluster->GetControlPointWeights(); 

 for (int j = 0 ; j < indexCount ; j++) 

 { 

 int vertex = indices[j]; 

 float weight = (float)weights[j]; 

 BoneAssignments ba;

 ba.ctrlPtsIndice = vertex;

 ba.weight = weight;

 ba.bone = bones[i];

 boneAssignments.push_back( ba );

 } 

 }

}

As show in the code to obtain the transformation matrix

KFbxXMatrix kTM; 

 cluster->GetTransformMatrix(kTM); 

 KFbxXMatrix kInvLinkMatrix(kLinkMatrix.Inverse()); 

 KFbxXMatrix kM(kInvLinkMatrix * kTM);

I like know
- This Matrix comes from the position of the skeleton in a certain animation time or comes from the original “skin pose” in where the skeleton was created?.
- If the answer to the previous question is no, how can i obtain the original skin pose for each KFbxCluster ?
- When i advance an animation how can i obtain the position in the current time for each KFbxCluster ?

Sorry for the long question but i was coding and coding with no results and i prefer question all this to not lose more time.

Replies: 1

From cluster->GetTransformMatrix you get the original pose of the geometry that is binded.
From cluster->GetTransformLinkMatrix you get the original pose of the skeleton.
Here are the documents of these two matrices:
* \li Transform refers to the global initial transform of the geometry node that contains the link node.
* \li TransformLink refers to global initial transform of the link node.

The code you posted are just get the information out of cluster and put them into the BoneAssignments, it did nothing about the animation.
To see how the cluster info can drive animated bones please take a look at the FBX SDK sample ViewScene, the ComputeClusterDeformation() function in DrawScene.cxx.

Take a look at the following post should also be helpful:
http://area.autodesk.com/for...he-vertices-of-a-cluster/

Author: Jiayang Xu

Replied: 22 September 2011 09:22 PM

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