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Working on processing the cluster/skin information.

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This commit is contained in:
Andrzej Kapolka 2013-10-11 17:51:29 -07:00
parent 56a888cc2a
commit cec0ee0b22
4 changed files with 138 additions and 25 deletions
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5
interface/src/avatar/BlendFace.cpp
View file

@ -59,6 +59,10 @@ void BlendFace::simulate(float deltaTime) {
const FBXGeometry& geometry = _geometry->getFBXGeometry();
if (_meshStates.isEmpty()) {
QVector<glm::vec3> vertices;
foreach (const FBXJoint& joint, geometry.joints) {
JointState state;
_jointStates.append(state);
}
foreach (const FBXMesh& mesh, geometry.meshes) {
MeshState state;
if (mesh.springiness > 0.0f) {
@ -365,5 +369,6 @@ void BlendFace::deleteGeometry() {
glDeleteBuffers(1, &id);
}
_blendedVertexBufferIDs.clear();
_jointStates.clear();
_meshStates.clear();
}

7
interface/src/avatar/BlendFace.h
View file

@ -58,6 +58,13 @@ private:
QSharedPointer<NetworkGeometry> _geometry;
class JointState {
public:
glm::quat rotation;
};
QVector<JointState> _jointStates;
class MeshState {
public:
QVector<glm::vec3> worldSpaceVertices;

127
interface/src/renderer/FBXReader.cpp
View file

@ -298,7 +298,7 @@ const char* FACESHIFT_BLENDSHAPES[] = {
""
};
class Transform {
class Model {
public:
QByteArray name;
bool inheritScale;
@ -306,20 +306,20 @@ public:
glm::mat4 withoutScale;
};
glm::mat4 getGlobalTransform(const QMultiHash<qint64, qint64>& parentMap, const QHash<qint64, Transform>& localTransforms,
glm::mat4 getGlobalTransform(const QMultiHash<qint64, qint64>& parentMap, const QHash<qint64, Model>& models,
qint64 nodeID, bool forceScale = true) {
glm::mat4 globalTransform;
bool useScale = true;
while (nodeID != 0) {
const Transform& localTransform = localTransforms.value(nodeID);
globalTransform = (useScale ? localTransform.withScale : localTransform.withoutScale) * globalTransform;
useScale = (useScale && localTransform.inheritScale) || forceScale;
const Model& model = models.value(nodeID);
globalTransform = (useScale ? model.withScale : model.withoutScale) * globalTransform;
useScale = (useScale && model.inheritScale) || forceScale;
QList<qint64> parentIDs = parentMap.values(nodeID);
nodeID = 0;
foreach (qint64 parentID, parentIDs) {
if (localTransforms.contains(parentID)) {
if (models.contains(parentID)) {
nodeID = parentID;
break;
}
@ -354,13 +354,31 @@ public:
float shininess;
};
class Cluster {
public:
QVector<int> indices;
QVector<double> weights;
glm::mat4 transformLink;
};
void appendModelIDs(qint64 parentID, const QMultiHash<qint64, qint64>& childMap, QHash<qint64, Model>& models, QVector<qint64>& modelIDs) {
if (parentID != 0) {
modelIDs.append(parentID);
}
foreach (qint64 childID, childMap.values(parentID)) {
if (models.contains(childID)) {
appendModelIDs(childID, childMap, models, modelIDs);
}
}
}
FBXGeometry extractFBXGeometry(const FBXNode& node, const QVariantHash& mapping) {
QHash<qint64, FBXMesh> meshes;
QVector<ExtractedBlendshape> blendshapes;
QMultiHash<qint64, qint64> parentMap;
QMultiHash<qint64, qint64> childMap;
QHash<qint64, Transform> localTransforms;
QHash<qint64, glm::mat4> transformLinkMatrices;
QHash<qint64, Model> models;
QHash<qint64, Cluster> clusters;
QHash<qint64, QByteArray> textureFilenames;
QHash<qint64, Material> materials;
QHash<qint64, qint64> diffuseTextures;
@ -536,7 +554,7 @@ FBXGeometry extractFBXGeometry(const FBXNode& node, const QVariantHash& mapping)
glm::vec3 preRotation, rotation, postRotation;
glm::vec3 scale = glm::vec3(1.0f, 1.0f, 1.0f);
glm::vec3 scalePivot, rotationPivot;
Transform transform = { name, true };
Model model = { name, true };
foreach (const FBXNode& subobject, object.children) {
if (subobject.name == "Properties70") {
foreach (const FBXNode& property, subobject.children) {
@ -577,20 +595,20 @@ FBXGeometry extractFBXGeometry(const FBXNode& node, const QVariantHash& mapping)
property.properties.at(6).value<double>());
} else if (property.properties.at(0) == "InheritType") {
transform.inheritScale = property.properties.at(4) != 2;
model.inheritScale = property.properties.at(4) != 2;
}
}
}
}
}
// see FBX documentation, http://download.autodesk.com/us/fbx/20112/FBX_SDK_HELP/index.html
transform.withoutScale = glm::translate(translation) * glm::translate(rotationPivot) *
model.withoutScale = glm::translate(translation) * glm::translate(rotationPivot) *
glm::mat4_cast(glm::quat(glm::radians(preRotation))) *
glm::mat4_cast(glm::quat(glm::radians(rotation))) *
glm::mat4_cast(glm::quat(glm::radians(postRotation))) * glm::translate(-rotationPivot);
transform.withScale = transform.withoutScale * glm::translate(scalePivot) * glm::scale(scale) *
model.withScale = model.withoutScale * glm::translate(scalePivot) * glm::scale(scale) *
glm::translate(-scalePivot);
localTransforms.insert(object.properties.at(0).value<qint64>(), transform);
models.insert(object.properties.at(0).value<qint64>(), model);
} else if (object.name == "Texture") {
foreach (const FBXNode& subobject, object.children) {
@ -628,12 +646,21 @@ FBXGeometry extractFBXGeometry(const FBXNode& node, const QVariantHash& mapping)
} else if (object.name == "Deformer") {
if (object.properties.at(2) == "Cluster") {
Cluster cluster;
foreach (const FBXNode& subobject, object.children) {
if (subobject.name == "TransformLink") {
if (subobject.name == "Indexes") {
cluster.indices = subobject.properties.at(0).value<QVector<int> >();
} else if (subobject.name == "Weights") {
cluster.weights = subobject.properties.at(0).value<QVector<double> >();
} else if (subobject.name == "TransformLink") {
QVector<double> values = subobject.properties.at(0).value<QVector<double> >();
transformLinkMatrices.insert(object.properties.at(0).value<qint64>(), createMat4(values));
cluster.transformLink = createMat4(values);
}
}
clusters.insert(object.properties.at(0).value<qint64>(), cluster);
} else if (object.properties.at(2) == "BlendShapeChannel") {
QByteArray name = object.properties.at(1).toByteArray();
name = name.left(name.indexOf('\0'));
@ -678,13 +705,24 @@ FBXGeometry extractFBXGeometry(const FBXNode& node, const QVariantHash& mapping)
}
// get offset transform from mapping
FBXGeometry geometry;
float offsetScale = mapping.value("scale", 1.0f).toFloat();
glm::mat4 offset = glm::translate(mapping.value("tx").toFloat(), mapping.value("ty").toFloat(),
geometry.offset = glm::translate(mapping.value("tx").toFloat(), mapping.value("ty").toFloat(),
mapping.value("tz").toFloat()) * glm::mat4_cast(glm::quat(glm::radians(glm::vec3(mapping.value("rx").toFloat(),
mapping.value("ry").toFloat(), mapping.value("rz").toFloat())))) *
glm::scale(offsetScale, offsetScale, offsetScale);
FBXGeometry geometry;
// get the list of models in depth-first traversal order
QVector<qint64> modelIDs;
appendModelIDs(0, childMap, models, modelIDs);
// convert the models to joints
foreach (qint64 modelID, modelIDs) {
FBXJoint joint;
joint.parentIndex = modelIDs.indexOf(parentMap.value(modelID));
geometry.joints.append(joint);
}
QVariantHash springs = mapping.value("spring").toHash();
QVariant defaultSpring = springs.value("default");
for (QHash<qint64, FBXMesh>::iterator it = meshes.begin(); it != meshes.end(); it++) {
@ -692,8 +730,8 @@ FBXGeometry extractFBXGeometry(const FBXNode& node, const QVariantHash& mapping)
// accumulate local transforms
qint64 modelID = parentMap.value(it.key());
mesh.springiness = springs.value(localTransforms.value(modelID).name, defaultSpring).toFloat();
glm::mat4 modelTransform = getGlobalTransform(parentMap, localTransforms, modelID);
mesh.springiness = springs.value(models.value(modelID).name, defaultSpring).toFloat();
glm::mat4 modelTransform = getGlobalTransform(parentMap, models, modelID);
// look for textures, material properties
foreach (qint64 childID, childMap.values(modelID)) {
@ -714,29 +752,68 @@ FBXGeometry extractFBXGeometry(const FBXNode& node, const QVariantHash& mapping)
}
}
// look for a limb pivot
// find the clusters with which the mesh is associated
mesh.isEye = false;
QVector<int> clusterIDs;
foreach (qint64 childID, childMap.values(it.key())) {
foreach (qint64 clusterID, childMap.values(childID)) {
if (!transformLinkMatrices.contains(clusterID)) {
if (!clusters.contains(clusterID)) {
continue;
}
FBXCluster fbxCluster;
const Cluster& cluster = clusters[clusterID];
clusterIDs.append(clusterID);
qint64 jointID = childMap.value(clusterID);
if (jointID == jointEyeLeftID || jointID == jointEyeRightID) {
mesh.isEye = true;
}
fbxCluster.jointIndex = modelIDs.indexOf(jointID);
fbxCluster.inverseBindMatrix = glm::inverse(cluster.transformLink) * modelTransform;
mesh.clusters.append(fbxCluster);
// see http://stackoverflow.com/questions/13566608/loading-skinning-information-from-fbx for a discussion
// of skinning information in FBX
glm::mat4 jointTransform = offset * getGlobalTransform(parentMap, localTransforms, jointID);
mesh.transform = jointTransform * glm::inverse(transformLinkMatrices.value(clusterID)) * modelTransform;
glm::mat4 jointTransform = geometry.offset * getGlobalTransform(parentMap, models, jointID);
mesh.transform = jointTransform * glm::inverse(cluster.transformLink) * modelTransform;
// extract translation component for pivot
glm::mat4 jointTransformScaled = offset * getGlobalTransform(parentMap, localTransforms, jointID, true);
glm::mat4 jointTransformScaled = geometry.offset * getGlobalTransform(parentMap, models, jointID, true);
mesh.pivot = glm::vec3(jointTransformScaled[3][0], jointTransformScaled[3][1], jointTransformScaled[3][2]);
}
}
// if we don't have a skinned joint, parent to the model itself
if (mesh.clusters.isEmpty()) {
FBXCluster cluster;
cluster.jointIndex = modelIDs.indexOf(modelID);
mesh.clusters.append(cluster);
}
// whether we're skinned depends on how many clusters are attached
if (clusterIDs.size() > 1) {
mesh.clusterIndices.resize(mesh.vertices.size());
mesh.clusterWeights.resize(mesh.vertices.size());
for (int i = 0; i < clusterIDs.size(); i++) {
qint64 clusterID = clusterIDs.at(i);
const Cluster& cluster = clusters[clusterID];
qint64 jointID = childMap.value(clusterID);
for (int j = 0; j < cluster.indices.size(); j++) {
int index = cluster.indices.at(j);
glm::vec4& weights = mesh.clusterWeights[index];
// look for an unused slot in the weights vector
for (int k = 0; k < 4; k++) {
if (weights[k] == 0.0f) {
mesh.clusterIndices[index][k] = i;
weights[k] = cluster.weights.at(j);
break;
}
}
}
}
}
// extract spring edges, connections if springy
if (mesh.springiness > 0.0f) {
QSet<QPair<int, int> > edges;
@ -781,7 +858,7 @@ FBXGeometry extractFBXGeometry(const FBXNode& node, const QVariantHash& mapping)
}
// extract translation component for neck pivot
glm::mat4 neckTransform = offset * getGlobalTransform(parentMap, localTransforms, jointNeckID, true);
glm::mat4 neckTransform = geometry.offset * getGlobalTransform(parentMap, models, jointNeckID, true);
geometry.neckPivot = glm::vec3(neckTransform[3][0], neckTransform[3][1], neckTransform[3][2]);
return geometry;

24
interface/src/renderer/FBXReader.h
View file

@ -37,6 +37,22 @@ public:
QVector<glm::vec3> normals;
};
/// A single joint (transformation node) extracted from an FBX document.
class FBXJoint {
public:
int parentIndex;
glm::quat rotation;
};
/// A single binding to a joint in an FBX document.
class FBXCluster {
public:
int jointIndex;
glm::mat4 inverseBindMatrix;
};
/// A single mesh (with optional blendshapes) extracted from an FBX document.
class FBXMesh {
public:
@ -46,6 +62,10 @@ public:
QVector<glm::vec3> vertices;
QVector<glm::vec3> normals;
QVector<glm::vec2> texCoords;
QVector<glm::vec4> clusterIndices;
QVector<glm::vec4> clusterWeights;
QVector<FBXCluster> clusters;
glm::vec3 pivot;
glm::mat4 transform;
@ -70,8 +90,12 @@ public:
class FBXGeometry {
public:
QVector<FBXJoint> joints;
QVector<FBXMesh> meshes;
glm::mat4 offset;
glm::vec3 neckPivot;
};