diff --git a/src/AnimGraphResource.cc b/src/AnimGraphResource.cc
index 6a46f62..f23bd04 100644
--- a/src/AnimGraphResource.cc
+++ b/src/AnimGraphResource.cc
@@ -368,7 +368,7 @@ void AnimGraph::UpdateOrderedNodes() {
         continue;
       }
 
-      int input_node_index = getAnimNodeIndex(input_node);
+      int input_node_index = input_node->m_index;
       bool is_node_processed = false;
       for (size_t j = 0, m = m_eval_ordered_nodes.size(); j < m; j++) {
         if (m_eval_ordered_nodes[j] == input_node) {
@@ -404,7 +404,7 @@ void AnimGraph::MarkActiveNodes() {
   for (size_t i = 0, n = m_eval_ordered_nodes.size(); i < n; i++) {
     AnimNode* node = m_eval_ordered_nodes[i];
     if (CheckIsNodeActive(node)) {
-      int node_index = getAnimNodeIndex(node);
+      int node_index = node->m_index;
       node->MarkActiveInputs(m_node_inputs[node_index]);
 
       // Non-animation data inputs are always active.
@@ -418,6 +418,18 @@ void AnimGraph::MarkActiveNodes() {
   }
 }
 
+void AnimGraph::EvalSyncTracks() {
+  for (size_t i = m_eval_ordered_nodes.size() - 1; i >= 0; i--) {
+    AnimNode* node = m_eval_ordered_nodes[i];
+    int node_index = node->m_index;
+    if (node->m_state == AnimNodeEvalState::Deactivated) {
+      continue;
+    }
+
+    node->CalcSyncTrack(m_node_inputs[node_index]);
+  }
+}
+
 void AnimGraph::UpdateTime(float dt) {
   const std::vector<NodeInput> graph_output_inputs = m_node_inputs[0];
   for (size_t i = 0, n = graph_output_inputs.size(); i < n; i++) {
@@ -433,7 +445,7 @@ void AnimGraph::UpdateTime(float dt) {
       continue;
     }
 
-    int node_index = getAnimNodeIndex(node);
+    int node_index = node->m_index;
     const std::vector<NodeInput> node_inputs =
         m_node_inputs[node_index];
     float node_time_now = node->m_time_now;
@@ -452,6 +464,17 @@ void AnimGraph::UpdateTime(float dt) {
   }
 }
 
+void AnimGraph::Evaluate() {
+  for (size_t i = m_eval_ordered_nodes.size() - 1; i >= 0; i--) {
+    AnimNode* node = m_eval_ordered_nodes[i];
+    if (node->m_state == AnimNodeEvalState::Deactivated) {
+      continue;
+    }
+
+    node->Evaluate();
+  }
+}
+
 void* AnimGraph::GetOutput(const std::string& name) const {
   Socket* socket = m_socket_accessor->FindInputSocket(name);
   if (socket == nullptr) {
diff --git a/src/AnimGraphResource.h b/src/AnimGraphResource.h
index d6ef851..1013f13 100644
--- a/src/AnimGraphResource.h
+++ b/src/AnimGraphResource.h
@@ -98,6 +98,14 @@ enum class AnimNodeEvalState {
 };
 
 struct AnimNode {
+  std::string m_name;
+  std::string m_node_type_name;
+  float m_time_now = 0.f;
+  float m_time_last = 0.f;
+  size_t m_index = -1;
+  AnimNodeEvalState m_state = AnimNodeEvalState::Undefined;
+  SyncTrack m_sync_track;
+
   virtual ~AnimNode(){};
 
   virtual void MarkActiveInputs(const std::vector<NodeInput>& inputs) {
@@ -109,18 +117,25 @@ struct AnimNode {
     }
   }
 
+  virtual void CalcSyncTrack(const std::vector<NodeInput>& inputs) {
+    for (size_t i = 0, n = inputs.size(); i < n; i++) {
+      AnimNode* input_node = inputs[i].m_node;
+      if (input_node != nullptr
+          && inputs[i].m_type == SocketType::SocketTypeAnimation
+          && input_node->m_state != AnimNodeEvalState::Deactivated) {
+        m_sync_track = input_node->m_sync_track;
+        return;
+      }
+    }
+  }
+
   virtual void UpdateTime(float time_last, float time_now) {
     m_time_last = time_last;
     m_time_now = time_now;
     m_state = AnimNodeEvalState::TimeUpdated;
   }
 
-  std::string m_name;
-  std::string m_node_type_name;
-  float m_time_now = 0.f;
-  float m_time_last = 0.f;
-  AnimNodeEvalState m_state = AnimNodeEvalState::Undefined;
-  SyncTrack m_sync_track;
+  virtual void Evaluate() {};
 };
 
 
@@ -598,6 +613,7 @@ struct AnimGraph {
   bool CheckIsNodeActive(AnimNode* node) {
     return node->m_state != AnimNodeEvalState::Deactivated;
   }
+  void EvalSyncTracks();
   void UpdateTime(float dt);
   void Evaluate();
   void Reset() {
@@ -658,17 +674,6 @@ struct AnimGraph {
     return nullptr;
   }
 
-  size_t getAnimNodeIndex(AnimNode* node) {
-    for (size_t i = 0, n = m_nodes.size(); i < n; i++) {
-      if (m_nodes[i] == node) {
-        return i;
-      }
-    }
-
-    std::cerr << "Could not find node " << node << "." << std::endl;
-    return -1;
-  }
-
   static AnimGraph createFromResource(const AnimGraphResource& resource) {
     AnimGraph result;
 
@@ -678,6 +683,7 @@ struct AnimGraph {
       AnimNode* node = AnimNodeFactory(node_resource.m_type_name.c_str());
       node->m_name = node_resource.m_name;
       node->m_node_type_name = node_resource.m_type_name;
+      node->m_index = i;
       result.m_nodes.push_back(node);
 
       assert(node_resource.m_socket_accessor != nullptr);
@@ -821,7 +827,7 @@ struct AnimGraph {
 
       (*source_socket->m_value.ptr_ptr) = target_socket->m_value.ptr;
 
-      size_t target_node_index = result.getAnimNodeIndex(target_node);
+      size_t target_node_index = target_node->m_index;
 
       std::vector<NodeInput>& node_inputs =
           result.m_node_inputs[target_node_index];
diff --git a/tests/AnimGraphResourceTests.cc b/tests/AnimGraphResourceTests.cc
index cdb8df6..87ac201 100644
--- a/tests/AnimGraphResourceTests.cc
+++ b/tests/AnimGraphResourceTests.cc
@@ -90,9 +90,9 @@ TEST_CASE("BasicGraph", "[AnimGraphResource]") {
       == graph.GetOutput("GraphOutput"));
 
   // check node input dependencies
-  size_t anim_sampler_index0 = graph.getAnimNodeIndex(anim_sampler_instance0);
-  size_t anim_sampler_index1 = graph.getAnimNodeIndex(anim_sampler_instance1);
-  size_t blend_index = graph.getAnimNodeIndex(blend2_instance);
+  size_t anim_sampler_index0 = anim_sampler_instance0->m_index;
+  size_t anim_sampler_index1 = anim_sampler_instance1->m_index;
+  size_t blend_index = blend2_instance->m_index;
 
   CHECK(graph.m_node_inputs[anim_sampler_index0].size() == 0);
   CHECK(graph.m_node_inputs[anim_sampler_index1].size() == 0);