- fbx: revamp transformation code to support rotation/scaling pivots and offsets. The information is encoded in additional nodes in the scene hierarchy, which are tagged with a special naming scheme to make them easy for users to identify and map to their systems.
Alexander Gessler
parent
23c62f07f7
commit
7f082e0aae
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@ -59,6 +59,9 @@ namespace FBX {
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using namespace Util;
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#define MAGIC_NODE_TAG "_$AssimpFbx$"
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// XXX vc9's debugger won't step into anonymous namespaces
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//namespace {
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@ -129,6 +132,8 @@ private:
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std::vector<aiNode*> nodes;
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nodes.reserve(conns.size());
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std::vector<aiNode*> nodes_chain;
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try {
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BOOST_FOREACH(const Connection* con, conns) {
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@ -146,16 +151,27 @@ private:
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const Model* const model = dynamic_cast<const Model*>(object);
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if(model) {
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aiNode* nd = new aiNode();
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nodes.push_back(nd);
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nodes_chain.clear();
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GenerateTransformationNodeChain(*model,nodes_chain);
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nd->mName.Set(FixNodeName(model->Name()));
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nd->mParent = &parent;
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ai_assert(nodes_chain.size());
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ConvertTransformation(*model,*nd);
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// link all nodes in a row
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aiNode* last_parent = &parent;
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BOOST_FOREACH(aiNode* prenode, nodes_chain) {
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ai_assert(prenode);
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ConvertModel(*model, *nd);
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ConvertNodes(model->ID(), *nd);
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prenode->mParent = last_parent;
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last_parent = prenode;
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}
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// attach geometry
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ConvertModel(*model, *nodes_chain.back());
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// attach sub-nodes
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ConvertNodes(model->ID(), *last_parent);
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nodes.push_back(nodes_chain.back());
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}
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}
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@ -167,50 +183,212 @@ private:
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}
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}
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catch(std::exception&) {
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std::for_each(nodes.begin(),nodes.end(),Util::delete_fun<aiNode>());
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Util::delete_fun<aiNode> deleter;
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std::for_each(nodes.begin(),nodes.end(),deleter);
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std::for_each(nodes_chain.begin(),nodes_chain.end(),deleter);
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}
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}
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enum TransformationComp
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{
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TransformationComp_Translation = 0,
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TransformationComp_RotationOffset,
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TransformationComp_RotationPivot,
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TransformationComp_PreRotation,
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TransformationComp_Rotation,
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TransformationComp_PostRotation,
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TransformationComp_RotationPivotInverse,
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TransformationComp_ScalingOffset,
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TransformationComp_ScalingPivot,
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TransformationComp_Scaling,
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TransformationComp_ScalingPivotInverse,
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TransformationComp_MAXIMUM
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};
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// ------------------------------------------------------------------------------------------------
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void ConvertTransformation(const Model& model, aiNode& nd)
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const char* NameTransformationComp(TransformationComp comp)
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{
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switch(comp)
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{
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case TransformationComp_Translation:
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return "Translation";
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case TransformationComp_RotationOffset:
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return "RotationOffset";
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case TransformationComp_RotationPivot:
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return "RotationPivot";
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case TransformationComp_PreRotation:
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return "PreRotation";
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case TransformationComp_Rotation:
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return "Rotation";
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case TransformationComp_PostRotation:
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return "PostRotation";
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case TransformationComp_RotationPivotInverse:
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return "RotationPivotInverse";
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case TransformationComp_ScalingOffset:
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return "ScalingOffset";
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case TransformationComp_ScalingPivot:
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return "ScalingPivot";
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case TransformationComp_Scaling:
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return "Scaling";
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case TransformationComp_ScalingPivotInverse:
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return "ScalingPivotInverse";
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}
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ai_assert(false);
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}
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enum RotationMode
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{
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RotationMode_Euler_XYZ
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};
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// ------------------------------------------------------------------------------------------------
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void GetRotationMatrix(RotationMode mode, const aiVector3D& rotation, aiMatrix4x4& out)
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{
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const float angle_epsilon = 1e-6f;
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aiMatrix4x4 temp;
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out = aiMatrix4x4();
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switch(mode)
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{
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case RotationMode_Euler_XYZ:
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if(fabs(rotation.x) > angle_epsilon) {
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out *= aiMatrix4x4::RotationX(rotation.x,temp);
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}
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if(fabs(rotation.y) > angle_epsilon) {
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out *= aiMatrix4x4::RotationY(rotation.y,temp);
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}
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if(fabs(rotation.z) > angle_epsilon) {
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out *= aiMatrix4x4::RotationZ(rotation.z,temp);
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}
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return;
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}
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ai_assert(false);
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}
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// ------------------------------------------------------------------------------------------------
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/** note: memory for output_nodes will be managed by the caller */
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void GenerateTransformationNodeChain(const Model& model,
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std::vector<aiNode*>& output_nodes)
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{
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const PropertyTable& props = model.Props();
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// XXX this is not complete, need to handle rotation and scaling pivots etc
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// XXX handle different rotation modes
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const RotationMode rot = RotationMode_Euler_XYZ;
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bool ok;
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aiMatrix4x4 chain[TransformationComp_MAXIMUM];
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std::fill_n(chain, static_cast<unsigned int>(TransformationComp_MAXIMUM), aiMatrix4x4());
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aiVector3D Translation = PropertyGet<aiVector3D>(props,"Lcl Translation",ok);
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if(!ok) {
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Translation = aiVector3D(0.0f,0.0f,0.0f);
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// generate transformation matrices for all the different transformation components
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const float zero_epsilon = 1e-6f;
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bool is_complex = false;
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const aiVector3D& PreRotation = PropertyGet<aiVector3D>(props,"PreRotation",ok);
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if(ok && PreRotation.SquareLength() > zero_epsilon) {
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is_complex = true;
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GetRotationMatrix(rot, PreRotation, chain[TransformationComp_PreRotation]);
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}
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aiVector3D Scaling = PropertyGet<aiVector3D>(props,"Lcl Scaling",ok);
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if(!ok) {
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Scaling = aiVector3D(1.0f,1.0f,1.0f);
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const aiVector3D& PostRotation = PropertyGet<aiVector3D>(props,"PostRotation",ok);
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if(ok && PostRotation.SquareLength() > zero_epsilon) {
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is_complex = true;
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GetRotationMatrix(rot, PostRotation, chain[TransformationComp_PostRotation]);
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}
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// XXX euler angles, radians, xyz order?
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aiVector3D Rotation = PropertyGet<aiVector3D>(props,"Lcl Rotation",ok);
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if(!ok) {
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Rotation = aiVector3D(0.0f,0.0f,0.0f);
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const aiVector3D& RotationPivot = PropertyGet<aiVector3D>(props,"RotationPivot",ok);
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if(ok && RotationPivot.SquareLength() > zero_epsilon) {
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is_complex = true;
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aiMatrix4x4::Translation(RotationPivot,chain[TransformationComp_RotationPivot]);
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aiMatrix4x4::Translation(-RotationPivot,chain[TransformationComp_RotationPivotInverse]);
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}
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aiMatrix4x4 temp;
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nd.mTransformation = aiMatrix4x4::Scaling(Scaling,temp);
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if(fabs(Rotation.x) > 1e-6f) {
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nd.mTransformation *= aiMatrix4x4::RotationX(Rotation.x,temp);
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const aiVector3D& RotationOffset = PropertyGet<aiVector3D>(props,"RotationOffset",ok);
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if(ok && RotationOffset.SquareLength() > zero_epsilon) {
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is_complex = true;
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aiMatrix4x4::Translation(RotationOffset,chain[TransformationComp_RotationOffset]);
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}
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if(fabs(Rotation.y) > 1e-6f) {
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nd.mTransformation *= aiMatrix4x4::RotationY(Rotation.y,temp);
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const aiVector3D& ScalingOffset = PropertyGet<aiVector3D>(props,"ScalingOffset",ok);
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if(ok && ScalingOffset.SquareLength() > zero_epsilon) {
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is_complex = true;
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aiMatrix4x4::Translation(ScalingOffset,chain[TransformationComp_ScalingOffset]);
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}
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if(fabs(Rotation.z) > 1e-6f) {
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nd.mTransformation *= aiMatrix4x4::RotationZ(Rotation.z,temp);
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const aiVector3D& ScalingPivot = PropertyGet<aiVector3D>(props,"ScalingPivot",ok);
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if(ok && ScalingPivot.SquareLength() > zero_epsilon) {
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is_complex = true;
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aiMatrix4x4::Translation(ScalingPivot,chain[TransformationComp_ScalingPivot]);
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aiMatrix4x4::Translation(-ScalingPivot,chain[TransformationComp_ScalingPivotInverse]);
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}
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const aiVector3D& Translation = PropertyGet<aiVector3D>(props,"Lcl Translation",ok);
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if(ok && Translation.SquareLength() > zero_epsilon) {
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aiMatrix4x4::Translation(Translation,chain[TransformationComp_Translation]);
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}
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const aiVector3D& Scaling = PropertyGet<aiVector3D>(props,"Lcl Scaling",ok);
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if(ok && fabs(Scaling.SquareLength()-1.0f) > zero_epsilon) {
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aiMatrix4x4::Scaling(Scaling,chain[TransformationComp_Scaling]);
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}
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const aiVector3D& Rotation = PropertyGet<aiVector3D>(props,"Lcl Rotation",ok);
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if(ok && Translation.SquareLength() > zero_epsilon) {
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GetRotationMatrix(rot, Rotation, chain[TransformationComp_Rotation]);
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}
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const std::string& name = FixNodeName(model.Name());
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// now, if we have more than just Translation, Scaling and Rotation,
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// we need to generate a full node chain to accommodate for assimp's
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// lack to express pivots and offsets.
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if(is_complex && doc.Settings().preservePivots) {
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FBXImporter::LogInfo("generating full transformation chain for node: " + name);
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const std::string mid = std::string(MAGIC_NODE_TAG) + "_";
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for (size_t i = 0; i < TransformationComp_MAXIMUM; ++i) {
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// XXX this may cause trouble with animations
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if (chain[i].IsIdentity()) {
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continue;
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}
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aiNode* nd = new aiNode();
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output_nodes.push_back(nd);
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nd->mName.Set(name + mid + NameTransformationComp(static_cast<TransformationComp>(i)));
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nd->mTransformation = chain[i];
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}
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ai_assert(output_nodes.size());
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return;
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}
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// else, we can just multiply the matrices together
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aiNode* nd = new aiNode();
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output_nodes.push_back(nd);
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nd->mName.Set(name);
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for (size_t i = 0; i < TransformationComp_MAXIMUM; ++i) {
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nd->mTransformation *= chain[i];
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}
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nd.mTransformation.a4 = Translation.x;
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nd.mTransformation.b4 = Translation.y;
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nd.mTransformation.c4 = Translation.z;
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}
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@ -59,6 +59,7 @@ struct ImportSettings
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, readAnimations(true)
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, strictMode(true)
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, readWeights(true)
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, preservePivots(true)
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{}
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@ -103,6 +104,28 @@ struct ImportSettings
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/** read bones (vertex weights and deform info).
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* Default value is true. */
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bool readWeights;
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/** preserve transformation pivots and offsets. Since these can
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* not directly be represented in assimp, additional dummy
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* nodes will be generated. Note that settings this to false
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* can make animation import a lot slower. The default value
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* is true.
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*
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* The naming scheme for the generated nodes is:
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* <OriginalName>_$AssimpFbx$_<TransformName>
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*
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* where <TransformName> is one of
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* RotationPivot
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* RotationOffset
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* PreRotation
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* PostRotation
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* ScalingPivot
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* ScalingOffset
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* Translation
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* Scaling
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* Rotation
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**/
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bool preservePivots;
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};
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