/**
* This method returns the type of the ipo curve.
*
* @param structure the structure must contain the 'rna_path' field and 'array_index' field (the
* type is not important here)
* @param blenderContext the blender context
* @return the type of the curve
*/
public int getCurveType(Structure structure, BlenderContext blenderContext) {
// reading rna path first
BlenderInputStream bis = blenderContext.getInputStream();
int currentPosition = bis.getPosition();
Pointer pRnaPath = (Pointer) structure.getFieldValue("rna_path");
FileBlockHeader dataFileBlock = blenderContext.getFileBlock(pRnaPath.getOldMemoryAddress());
bis.setPosition(dataFileBlock.getBlockPosition());
String rnaPath = bis.readString();
bis.setPosition(currentPosition);
int arrayIndex = ((Number) structure.getFieldValue("array_index")).intValue();
// determining the curve type
if (rnaPath.endsWith("location")) {
return Ipo.AC_LOC_X + arrayIndex;
}
if (rnaPath.endsWith("rotation_quaternion")) {
return Ipo.AC_QUAT_W + arrayIndex;
}
if (rnaPath.endsWith("scale")) {
return Ipo.AC_SIZE_X + arrayIndex;
}
if (rnaPath.endsWith("rotation") || rnaPath.endsWith("rotation_euler")) {
return Ipo.OB_ROT_X + arrayIndex;
}
LOGGER.log(Level.WARNING, "Unknown curve rna path: {0}", rnaPath);
return -1;
}
/**
* This method retuns the bone tracks for animation for blender version 2.50 and higher.
*
* @param actionStructure the structure containing the tracks
* @param blenderContext the blender context
* @return a list of tracks for the specified animation
* @throws BlenderFileException an exception is thrown when there are problems with the blend file
*/
private BlenderAction getTracks250(Structure actionStructure, BlenderContext blenderContext)
throws BlenderFileException {
LOGGER.log(Level.FINE, "Getting tracks!");
Structure groups = (Structure) actionStructure.getFieldValue("groups");
List<Structure> actionGroups = groups.evaluateListBase(); // bActionGroup
BlenderAction blenderAction =
new BlenderAction(actionStructure.getName(), blenderContext.getBlenderKey().getFps());
int lastFrame = 1;
for (Structure actionGroup : actionGroups) {
String name = actionGroup.getFieldValue("name").toString();
List<Structure> channels =
((Structure) actionGroup.getFieldValue("channels")).evaluateListBase();
BezierCurve[] bezierCurves = new BezierCurve[channels.size()];
int channelCounter = 0;
for (Structure c : channels) {
int type = this.getCurveType(c, blenderContext);
Pointer pBezTriple = (Pointer) c.getFieldValue("bezt");
List<Structure> bezTriples = pBezTriple.fetchData();
bezierCurves[channelCounter++] = new BezierCurve(type, bezTriples, 2);
}
Ipo ipo = new Ipo(bezierCurves, fixUpAxis, blenderContext.getBlenderVersion());
lastFrame = Math.max(lastFrame, ipo.getLastFrame());
blenderAction.featuresTracks.put(name, ipo);
}
blenderAction.stopFrame = lastFrame;
return blenderAction;
}
@Override
@SuppressWarnings("unchecked")
public Node apply(Node node, BlenderContext blenderContext) {
if (invalid) {
LOGGER.log(
Level.WARNING, "Armature modifier is invalid! Cannot be applied to: {0}", node.getName());
} // if invalid, animData will be null
if (animData == null) {
return node;
}
// setting weights for bones
List<Geometry> geomList =
(List<Geometry>)
blenderContext.getLoadedFeature(this.meshOMA, LoadedFeatureDataType.LOADED_FEATURE);
for (Geometry geom : geomList) {
Mesh mesh = geom.getMesh();
if (this.verticesWeights != null) {
mesh.setMaxNumWeights(this.boneGroups);
mesh.setBuffer(this.verticesWeights);
mesh.setBuffer(this.verticesWeightsIndices);
}
}
ArrayList<Animation> animList = animData.anims;
if (animList != null && animList.size() > 0) {
List<Constraint> constraints = blenderContext.getConstraints(this.armatureObjectOMA);
HashMap<String, Animation> anims = new HashMap<String, Animation>();
for (int i = 0; i < animList.size(); ++i) {
Animation animation = (Animation) animList.get(i).clone();
// baking constraints into animations
if (constraints != null && constraints.size() > 0) {
for (Constraint constraint : constraints) {
Long boneOMA = constraint.getBoneOMA();
Bone bone =
(Bone)
blenderContext.getLoadedFeature(boneOMA, LoadedFeatureDataType.LOADED_FEATURE);
int targetIndex =
bone == null
? 0
: animData.skeleton.getBoneIndex(
bone); // bone==null may mean the object animation
constraint.affectAnimation(animation, targetIndex);
}
}
anims.put(animation.getName(), animation);
}
// applying the control to the node
SkeletonControl skeletonControl = new SkeletonControl(animData.skeleton);
AnimControl control = new AnimControl(animData.skeleton);
control.setAnimations(anims);
node.addControl(control);
node.addControl(skeletonControl);
}
return node;
}
/**
* Constructor. Creates the basic set of bone's data.
*
* @param boneStructure the bone's structure
* @param parent bone's parent (null if the bone is the root bone)
* @param objectToArmatureMatrix object-to-armature transformation matrix
* @param bonesPoseChannels a map of pose channels for each bone OMA
* @param blenderContext the blender context
* @throws BlenderFileException an exception is thrown when problem with blender data reading
* occurs
*/
private BoneContext(
Structure boneStructure,
BoneContext parent,
Matrix4f objectToArmatureMatrix,
final Map<Long, Structure> bonesPoseChannels,
BlenderContext blenderContext)
throws BlenderFileException {
this.parent = parent;
this.boneStructure = boneStructure;
boneName = boneStructure.getFieldValue("name").toString();
ObjectHelper objectHelper = blenderContext.getHelper(ObjectHelper.class);
armatureMatrix = objectHelper.getMatrix(boneStructure, "arm_mat", true);
fixUpAxis = blenderContext.getBlenderKey().isFixUpAxis();
this.computeRestMatrix(objectToArmatureMatrix);
List<Structure> childbase =
((Structure) boneStructure.getFieldValue("childbase")).evaluateListBase(blenderContext);
for (Structure child : childbase) {
this.children.add(
new BoneContext(child, this, objectToArmatureMatrix, bonesPoseChannels, blenderContext));
}
poseChannel = bonesPoseChannels.get(boneStructure.getOldMemoryAddress());
blenderContext.setBoneContext(boneStructure.getOldMemoryAddress(), this);
}
protected String getConstraintClassName(
Structure constraintStructure, BlenderContext blenderContext) throws BlenderFileException {
Pointer pData = (Pointer) constraintStructure.getFieldValue("data");
if (pData.isNotNull()) {
Structure data = pData.fetchData(blenderContext.getInputStream()).get(0);
return data.getType();
}
return constraintStructure.getType();
}
/**
* This method reads mesh indexes
*
* @param objectStructure structure of the object that has the armature modifier applied
* @param meshStructure the structure of the object's mesh
* @param blenderContext the blender context
* @throws BlenderFileException this exception is thrown when the blend file structure is somehow
* invalid or corrupted
*/
private void readVerticesWeightsData(
Structure objectStructure, Structure meshStructure, BlenderContext blenderContext)
throws BlenderFileException {
ArmatureHelper armatureHelper = blenderContext.getHelper(ArmatureHelper.class);
Structure defBase = (Structure) objectStructure.getFieldValue("defbase");
Map<Integer, Integer> groupToBoneIndexMap =
armatureHelper.getGroupToBoneIndexMap(defBase, blenderContext);
int[] bonesGroups = new int[] {0};
MeshContext meshContext = blenderContext.getMeshContext(meshStructure.getOldMemoryAddress());
VertexBuffer[] boneWeightsAndIndex =
this.getBoneWeightAndIndexBuffer(
meshStructure,
meshContext.getVertexList().size(),
bonesGroups,
meshContext.getVertexReferenceMap(),
groupToBoneIndexMap,
blenderContext);
this.verticesWeights = boneWeightsAndIndex[0];
this.verticesWeightsIndices = boneWeightsAndIndex[1];
this.boneGroups = bonesGroups[0];
}
/**
* This method builds the bone. It recursively builds the bone's children.
*
* @param bones a list of bones where the newly created bone will be added
* @param boneOMAs the map between bone and its old memory address
* @param blenderContext the blender context
* @return newly created bone
*/
public Bone buildBone(List<Bone> bones, Map<Bone, Long> boneOMAs, BlenderContext blenderContext) {
Long boneOMA = boneStructure.getOldMemoryAddress();
bone = new Bone(boneName);
bones.add(bone);
boneOMAs.put(bone, boneOMA);
blenderContext.addLoadedFeatures(boneOMA, boneName, boneStructure, bone);
Matrix4f pose = this.restMatrix.clone();
ObjectHelper objectHelper = blenderContext.getHelper(ObjectHelper.class);
Vector3f poseLocation = pose.toTranslationVector();
Quaternion rotation = pose.toRotationQuat();
Vector3f scale = objectHelper.getScale(pose);
bone.setBindTransforms(poseLocation, rotation, scale);
for (BoneContext child : children) {
bone.addChild(child.buildBone(bones, boneOMAs, blenderContext));
}
this.computePoseTransform();
return bone;
}
/**
* This method creates an ipo object used for interpolation calculations.
*
* @param ipoStructure the structure with ipo definition
* @param blenderContext the blender context
* @return the ipo object
* @throws BlenderFileException this exception is thrown when the blender file is somehow
* corrupted
*/
public Ipo fromIpoStructure(Structure ipoStructure, BlenderContext blenderContext)
throws BlenderFileException {
Structure curvebase = (Structure) ipoStructure.getFieldValue("curve");
// preparing bezier curves
Ipo result = null;
List<Structure> curves = curvebase.evaluateListBase(); // IpoCurve
if (curves.size() > 0) {
BezierCurve[] bezierCurves = new BezierCurve[curves.size()];
int frame = 0;
for (Structure curve : curves) {
Pointer pBezTriple = (Pointer) curve.getFieldValue("bezt");
List<Structure> bezTriples = pBezTriple.fetchData();
int type = ((Number) curve.getFieldValue("adrcode")).intValue();
bezierCurves[frame++] = new BezierCurve(type, bezTriples, 2);
}
curves.clear();
result = new Ipo(bezierCurves, fixUpAxis, blenderContext.getBlenderVersion());
Long ipoOma = ipoStructure.getOldMemoryAddress();
blenderContext.addLoadedFeatures(ipoOma, LoadedDataType.STRUCTURE, ipoStructure);
blenderContext.addLoadedFeatures(ipoOma, LoadedDataType.FEATURE, result);
}
return result;
}
/**
* This method retuns the bone tracks for animation for blender version 2.49 (and probably several
* lower versions too).
*
* @param actionStructure the structure containing the tracks
* @param blenderContext the blender context
* @return a list of tracks for the specified animation
* @throws BlenderFileException an exception is thrown when there are problems with the blend file
*/
private BlenderAction getTracks249(Structure actionStructure, BlenderContext blenderContext)
throws BlenderFileException {
LOGGER.log(Level.FINE, "Getting tracks!");
Structure chanbase = (Structure) actionStructure.getFieldValue("chanbase");
List<Structure> actionChannels = chanbase.evaluateListBase(); // bActionChannel
BlenderAction blenderAction =
new BlenderAction(actionStructure.getName(), blenderContext.getBlenderKey().getFps());
int lastFrame = 1;
for (Structure bActionChannel : actionChannels) {
String animatedFeatureName = bActionChannel.getFieldValue("name").toString();
Pointer p = (Pointer) bActionChannel.getFieldValue("ipo");
if (!p.isNull()) {
Structure ipoStructure = p.fetchData().get(0);
Ipo ipo = this.fromIpoStructure(ipoStructure, blenderContext);
if (ipo != null) { // this can happen when ipo with no curves appear in blender file
lastFrame = Math.max(lastFrame, ipo.getLastFrame());
blenderAction.featuresTracks.put(animatedFeatureName, ipo);
}
}
}
blenderAction.stopFrame = lastFrame;
return blenderAction;
}
/**
* This method reads constraints for for the given structure. The constraints are loaded only once
* for object/bone.
*
* @param objectStructure the structure we read constraint's for
* @param blenderContext the blender context
* @throws BlenderFileException
*/
public void loadConstraints(Structure objectStructure, BlenderContext blenderContext)
throws BlenderFileException {
LOGGER.fine("Loading constraints.");
// reading influence ipos for the constraints
IpoHelper ipoHelper = blenderContext.getHelper(IpoHelper.class);
Map<String, Map<String, Ipo>> constraintsIpos = new HashMap<String, Map<String, Ipo>>();
Pointer pActions = (Pointer) objectStructure.getFieldValue("action");
if (pActions.isNotNull()) {
List<Structure> actions = pActions.fetchData(blenderContext.getInputStream());
for (Structure action : actions) {
Structure chanbase = (Structure) action.getFieldValue("chanbase");
List<Structure> actionChannels = chanbase.evaluateListBase(blenderContext);
for (Structure actionChannel : actionChannels) {
Map<String, Ipo> ipos = new HashMap<String, Ipo>();
Structure constChannels = (Structure) actionChannel.getFieldValue("constraintChannels");
List<Structure> constraintChannels = constChannels.evaluateListBase(blenderContext);
for (Structure constraintChannel : constraintChannels) {
Pointer pIpo = (Pointer) constraintChannel.getFieldValue("ipo");
if (pIpo.isNotNull()) {
String constraintName = constraintChannel.getFieldValue("name").toString();
Ipo ipo =
ipoHelper.fromIpoStructure(
pIpo.fetchData(blenderContext.getInputStream()).get(0), blenderContext);
ipos.put(constraintName, ipo);
}
}
String actionName = actionChannel.getFieldValue("name").toString();
constraintsIpos.put(actionName, ipos);
}
}
}
// loading constraints connected with the object's bones
Pointer pPose = (Pointer) objectStructure.getFieldValue("pose");
if (pPose.isNotNull()) {
List<Structure> poseChannels =
((Structure)
pPose.fetchData(blenderContext.getInputStream()).get(0).getFieldValue("chanbase"))
.evaluateListBase(blenderContext);
for (Structure poseChannel : poseChannels) {
List<Constraint> constraintsList = new ArrayList<Constraint>();
Long boneOMA =
Long.valueOf(((Pointer) poseChannel.getFieldValue("bone")).getOldMemoryAddress());
// the name is read directly from structure because bone might not yet be loaded
String name =
blenderContext
.getFileBlock(boneOMA)
.getStructure(blenderContext)
.getFieldValue("name")
.toString();
List<Structure> constraints =
((Structure) poseChannel.getFieldValue("constraints")).evaluateListBase(blenderContext);
for (Structure constraint : constraints) {
String constraintName = constraint.getFieldValue("name").toString();
Map<String, Ipo> ipoMap = constraintsIpos.get(name);
Ipo ipo = ipoMap == null ? null : ipoMap.get(constraintName);
if (ipo == null) {
float enforce = ((Number) constraint.getFieldValue("enforce")).floatValue();
ipo = ipoHelper.fromValue(enforce);
}
constraintsList.add(this.createConstraint(constraint, boneOMA, ipo, blenderContext));
}
blenderContext.addConstraints(boneOMA, constraintsList);
}
}
// loading constraints connected with the object itself
List<Structure> constraints =
((Structure) objectStructure.getFieldValue("constraints")).evaluateListBase(blenderContext);
List<Constraint> constraintsList = new ArrayList<Constraint>(constraints.size());
for (Structure constraint : constraints) {
String constraintName = constraint.getFieldValue("name").toString();
String objectName = objectStructure.getName();
Map<String, Ipo> objectConstraintsIpos = constraintsIpos.get(objectName);
Ipo ipo = objectConstraintsIpos != null ? objectConstraintsIpos.get(constraintName) : null;
if (ipo == null) {
float enforce = ((Number) constraint.getFieldValue("enforce")).floatValue();
ipo = ipoHelper.fromValue(enforce);
}
constraintsList.add(
this.createConstraint(
constraint, objectStructure.getOldMemoryAddress(), ipo, blenderContext));
}
blenderContext.addConstraints(objectStructure.getOldMemoryAddress(), constraintsList);
}
/**
* This constructor reads animation data from the object structore. The stored data is the
* AnimData and additional data is armature's OMA.
*
* @param objectStructure the structure of the object
* @param modifierStructure the structure of the modifier
* @param blenderContext the blender context
* @throws BlenderFileException this exception is thrown when the blender file is somehow
* corrupted
*/
public ArmatureModifier(
Structure objectStructure, Structure modifierStructure, BlenderContext blenderContext)
throws BlenderFileException {
if (this.validate(modifierStructure, blenderContext)) {
Pointer pArmatureObject = (Pointer) modifierStructure.getFieldValue("object");
if (pArmatureObject.isNotNull()) {
ObjectHelper objectHelper = blenderContext.getHelper(ObjectHelper.class);
ArmatureHelper armatureHelper = blenderContext.getHelper(ArmatureHelper.class);
Structure armatureObject =
pArmatureObject.fetchData(blenderContext.getInputStream()).get(0);
this.armatureObjectOMA = armatureObject.getOldMemoryAddress();
// read skeleton
// changing bones matrices so that they fit the current object
Structure armatureStructure =
((Pointer) armatureObject.getFieldValue("data"))
.fetchData(blenderContext.getInputStream())
.get(0);
Structure bonebase = (Structure) armatureStructure.getFieldValue("bonebase");
List<Structure> bonesStructures = bonebase.evaluateListBase(blenderContext);
for (Structure boneStructure : bonesStructures) {
BoneTransformationData rootBoneTransformationData =
armatureHelper.readBoneAndItsChildren(boneStructure, null, blenderContext);
armatureHelper.addBoneDataRoot(rootBoneTransformationData);
}
Matrix4f armatureObjectMatrix = objectHelper.getTransformationMatrix(armatureObject);
Matrix4f inverseMeshObjectMatrix =
objectHelper.getTransformationMatrix(objectStructure).invert();
Matrix4f additionalRootBoneTransformation =
inverseMeshObjectMatrix.multLocal(armatureObjectMatrix);
Bone[] bones =
armatureHelper.buildBonesStructure(Long.valueOf(0L), additionalRootBoneTransformation);
// read mesh indexes
Structure meshStructure =
((Pointer) objectStructure.getFieldValue("data"))
.fetchData(blenderContext.getInputStream())
.get(0);
this.meshOMA = meshStructure.getOldMemoryAddress();
this.readVerticesWeightsData(objectStructure, meshStructure, blenderContext);
// read animations
ArrayList<Animation> animations = new ArrayList<Animation>();
List<FileBlockHeader> actionHeaders =
blenderContext.getFileBlocks(Integer.valueOf(FileBlockHeader.BLOCK_AC00));
if (actionHeaders != null) { // it may happen that the model has armature with no actions
for (FileBlockHeader header : actionHeaders) {
Structure actionStructure = header.getStructure(blenderContext);
String actionName = actionStructure.getName();
BoneTrack[] tracks = armatureHelper.getTracks(actionStructure, blenderContext);
// determining the animation time
float maximumTrackLength = 0;
for (BoneTrack track : tracks) {
float length = track.getLength();
if (length > maximumTrackLength) {
maximumTrackLength = length;
}
}
Animation boneAnimation = new Animation(actionName, maximumTrackLength);
boneAnimation.setTracks(tracks);
animations.add(boneAnimation);
}
}
animData = new AnimData(new Skeleton(bones), animations);
}
}
}
/**
* This method returns an array of size 2. The first element is a vertex buffer holding bone
* weights for every vertex in the model. The second element is a vertex buffer holding bone
* indices for vertices (the indices of bones the vertices are assigned to).
*
* @param meshStructure the mesh structure object
* @param vertexListSize a number of vertices in the model
* @param bonesGroups this is an output parameter, it should be a one-sized array; the maximum
* amount of weights per vertex (up to MAXIMUM_WEIGHTS_PER_VERTEX) is stored there
* @param vertexReferenceMap this reference map allows to map the original vertices read from
* blender to vertices that are really in the model; one vertex may appear several times in
* the result model
* @param groupToBoneIndexMap this object maps the group index (to which a vertices in blender
* belong) to bone index of the model
* @param blenderContext the blender context
* @return arrays of vertices weights and their bone indices and (as an output parameter) the
* maximum amount of weights for a vertex
* @throws BlenderFileException this exception is thrown when the blend file structure is somehow
* invalid or corrupted
*/
private VertexBuffer[] getBoneWeightAndIndexBuffer(
Structure meshStructure,
int vertexListSize,
int[] bonesGroups,
Map<Integer, List<Integer>> vertexReferenceMap,
Map<Integer, Integer> groupToBoneIndexMap,
BlenderContext blenderContext)
throws BlenderFileException {
Pointer pDvert = (Pointer) meshStructure.getFieldValue("dvert"); // dvert = DeformVERTices
FloatBuffer weightsFloatData =
BufferUtils.createFloatBuffer(vertexListSize * MAXIMUM_WEIGHTS_PER_VERTEX);
ByteBuffer indicesData =
BufferUtils.createByteBuffer(vertexListSize * MAXIMUM_WEIGHTS_PER_VERTEX);
if (pDvert.isNotNull()) { // assigning weights and bone indices
List<Structure> dverts =
pDvert.fetchData(
blenderContext.getInputStream()); // dverts.size() == verticesAmount (one dvert per
// vertex in blender)
int vertexIndex = 0;
for (Structure dvert : dverts) {
int totweight =
((Number) dvert.getFieldValue("totweight"))
.intValue(); // total amount of weights assignet to the vertex
// (max. 4 in JME)
Pointer pDW = (Pointer) dvert.getFieldValue("dw");
List<Integer> vertexIndices =
vertexReferenceMap.get(
Integer.valueOf(vertexIndex)); // we fetch the referenced vertices here
if (totweight > 0
&& pDW.isNotNull()
&& groupToBoneIndexMap
!= null) { // pDW should never be null here, but I check it just in case :)
int weightIndex = 0;
List<Structure> dw = pDW.fetchData(blenderContext.getInputStream());
for (Structure deformWeight : dw) {
Integer boneIndex =
groupToBoneIndexMap.get(((Number) deformWeight.getFieldValue("def_nr")).intValue());
// Remove this code if 4 weights limitation is removed
if (weightIndex == 4) {
LOGGER.log(
Level.WARNING,
"{0} has more than 4 weight on bone index {1}",
new Object[] {meshStructure.getName(), boneIndex});
break;
}
if (boneIndex
!= null) { // null here means that we came accross group that has no bone attached
// to
float weight = ((Number) deformWeight.getFieldValue("weight")).floatValue();
if (weight == 0.0f) {
weight = 1;
boneIndex = Integer.valueOf(0);
}
// we apply the weight to all referenced vertices
for (Integer index : vertexIndices) {
weightsFloatData.put(index * MAXIMUM_WEIGHTS_PER_VERTEX + weightIndex, weight);
indicesData.put(
index * MAXIMUM_WEIGHTS_PER_VERTEX + weightIndex, boneIndex.byteValue());
}
}
++weightIndex;
}
} else {
for (Integer index : vertexIndices) {
weightsFloatData.put(index * MAXIMUM_WEIGHTS_PER_VERTEX, 1.0f);
indicesData.put(index * MAXIMUM_WEIGHTS_PER_VERTEX, (byte) 0);
}
}
++vertexIndex;
}
} else {
// always bind all vertices to 0-indexed bone
// this bone makes the model look normally if vertices have no bone assigned
// and it is used in object animation, so if we come accross object animation
// we can use the 0-indexed bone for this
for (List<Integer> vertexIndexList : vertexReferenceMap.values()) {
// we apply the weight to all referenced vertices
for (Integer index : vertexIndexList) {
weightsFloatData.put(index * MAXIMUM_WEIGHTS_PER_VERTEX, 1.0f);
indicesData.put(index * MAXIMUM_WEIGHTS_PER_VERTEX, (byte) 0);
}
}
}
bonesGroups[0] = this.endBoneAssigns(vertexListSize, weightsFloatData);
VertexBuffer verticesWeights = new VertexBuffer(Type.BoneWeight);
verticesWeights.setupData(Usage.CpuOnly, bonesGroups[0], Format.Float, weightsFloatData);
VertexBuffer verticesWeightsIndices = new VertexBuffer(Type.BoneIndex);
verticesWeightsIndices.setupData(
Usage.CpuOnly, bonesGroups[0], Format.UnsignedByte, indicesData);
return new VertexBuffer[] {verticesWeights, verticesWeightsIndices};
}
