dotXSI and bones/skinning code 2005-06-06 - By Daniel
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Hi,
I have moved all my engine work over from using custom plugin for xsi into
using the dotXSI format and the FTK.
Its all working great for all geometry, etc but i have problems with getting
the bones to work correct.
My basic code looks kinda of like this:
What this code is supposed to do is to calculated the global inverse matrix of
the the rest position of the bone.
buildSkinInfo(CSLModel* model)
{
// cut away some init, setup, etc, code
CSLEnvelope** envelopList = model->GetEnvelopeList();
for (int i = 0; i < model->GetEnvelopeCount(); ++i)
{
CSLEnvelope* envelope = envelopList[i];
CSLModel* deformerModel = envelope->GetDeformer();
Node* boneNode = findNode(deformerModel); // node is a own type of node
, basic just a simple Node in a scenegraph
m_bones[i].setTarget(boneNode); // stores the target for the node
CSLTransform* transform = deformerModel->GetBasePose();
transform->ComputeGlobalMatrix();
CSIBCMatrix4x4& globalMatrix = transform->GetGlobalMatrix();
CSIBCMatrix4x4 inversMatrix;
globalMatrix.GetInverse(inversMatrix);
m_bones[i].setRestTransform(inversMatrix);
//...
}
And later in my update function
void update(float time)
{
// this code assumes that all targets have been updated with animations,
positions, etc already
for (uint i = 0; i < bones.count(); ++i)
m_bones[i].setTransform(m_bones[i].restTransform() * m_bones[i].target()-
>worldTransform()); // matrix multiply the 4x4 matrises
// and then use the matrices calculated here with the weights etc stored in
the envelopes.
}
I wonder if anyone on this list has done anything similar to this and got it
working, any help would be very appreciated.
Daniel
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