diff --git a/src/library/VRMExporterv0.js b/src/library/VRMExporterv0.js
index fec08cac..1cbf562a 100644
--- a/src/library/VRMExporterv0.js
+++ b/src/library/VRMExporterv0.js
@@ -97,7 +97,7 @@ function getVRM0BoneName(name){
   return name;
 }
 export default class VRMExporterv0 {
-    parse(vrm, avatar, onDone) {
+    parse(vrm, avatar, rootSpringBones, colliderBones, onDone) {
         const vrmMeta = convertMetaToVRM0(vrm.meta);
         const humanoid = convertHumanoidToVRM0(vrm.humanoid);
         
@@ -417,7 +417,48 @@ export default class VRMExporterv0 {
 
         //const outputVrmMeta = ToOutputVRMMeta(vrmMeta, icon, outputImages);
         const outputVrmMeta = vrmMeta;
-        //const outputSecondaryAnimation = toOutputSecondaryAnimation(springBone, nodeNames);
+
+        const rootSpringBonesIndexes = [];
+        rootSpringBones.forEach(rootSpringBone => {
+            for (let i = 0; i < nodes.length; i++) {
+                const node = nodes[i];
+                if (node.name === rootSpringBone.name) {
+                    rootSpringBonesIndexes.push(i);
+                    break;
+                }
+            }
+        })
+
+        const colliderGroups = [];
+        const colliderGroupsIndexes = [];
+        colliderBones.forEach((colliderBone, i) => {
+            const nodeIndex = nodes.indexOf(colliderBone);
+            const colliderGroup = {
+                "colliders": [
+                    { "offset": { "x": 0, "y": 0.05, "z": 0 }, "radius": 0.075 }
+                ],
+                "node": nodeIndex
+            }
+            colliderGroups.push(colliderGroup);
+            colliderGroupsIndexes.push(i);
+        })
+
+        const outputSecondaryAnimation = {
+            "boneGroups": [
+                {
+                "bones": rootSpringBonesIndexes,
+                "center": -1,
+                "colliderGroups": colliderGroupsIndexes,
+                "dragForce": 0.452,
+                "gravityDir": { "x": 0, "y": 0, "z": 0 },
+                "gravityPower": 0,
+                "hitRadius": 0.01,
+                "stiffiness": 1
+                }
+            ],
+            "colliderGroups": colliderGroups,
+        };
+        
         const bufferViews = [];
         bufferViews.push(...images.map((image) => ({
             buffer: imageBitmap2png(image.imageBitmap),
@@ -479,7 +520,7 @@ export default class VRMExporterv0 {
                     materialProperties,
                     humanoid: vrmHumanoid,
                     meta: outputVrmMeta,
-                    //secondaryAnimation: outputSecondaryAnimation,
+                    secondaryAnimation: outputSecondaryAnimation,
                     specVersion: "0.0"
                 },
             },
diff --git a/src/library/download-utils.js b/src/library/download-utils.js
index 07e35401..c2126055 100644
--- a/src/library/download-utils.js
+++ b/src/library/download-utils.js
@@ -157,24 +157,53 @@ function parseVRM (glbModel, avatar, isVrm0 = false){
       ...getVRMBaseData(avatar),
       ...getAvatarData(glbModel, "CharacterCreator"),
     }
+
     let skinnedMesh;
     glbModel.traverse(child => {
       if (child.isSkinnedMesh) skinnedMesh = child;
     })
-    skinnedMesh.skeleton.bones.forEach(bone => {
-      if (bone.name !== 'root') {
-        bone.position.x *= -1;
-        bone.position.z *= -1;
-      }
-    })
-    skinnedMesh.skeleton.bones.forEach(bone => {
-      bone.updateMatrix();
-      bone.updateMatrixWorld();
-    })
-    skinnedMesh.skeleton.calculateInverses();
-    skinnedMesh.skeleton.computeBoneTexture();
-    skinnedMesh.skeleton.update();
-    exporter.parse(vrmData, glbModel, (vrm) => {
+
+    const reverseBonesXZ = () => {
+      skinnedMesh.skeleton.bones.forEach(bone => {
+        if (bone.name !== 'root') {
+          bone.position.x *= -1;
+          bone.position.z *= -1;
+        }
+      })
+      skinnedMesh.skeleton.bones.forEach(bone => {
+        bone.updateMatrix();
+        bone.updateMatrixWorld();
+      })
+      skinnedMesh.skeleton.calculateInverses();
+      skinnedMesh.skeleton.computeBoneTexture();
+      skinnedMesh.skeleton.update();
+    }
+    reverseBonesXZ();
+    
+    const headBone = skinnedMesh.skeleton.bones.filter(bone => bone.name === 'head')[0];
+
+    const rootSpringBones = [];
+    const processSpringBones = () => {
+      headBone.children.forEach(hairTypeGroup => {
+        if (!hairTypeGroup.name.startsWith('hair_')) return;
+        const nameParts = hairTypeGroup.name.split('_');
+        const hairId = nameParts[1];
+        if (hairId === avatar.head.traitInfo.id) { // note: only export the hairTypeGroup of current selected hair.
+          hairTypeGroup.children.forEach(strandRoot => {
+            rootSpringBones.push(strandRoot);
+          });
+        }
+      });
+    }
+    processSpringBones();
+
+    const colliderBones = [];
+    const processColliderBones = () => {
+      colliderBones.push(headBone);
+    }
+    processColliderBones();
+
+    exporter.parse(vrmData, glbModel, rootSpringBones, colliderBones, (vrm) => {
       resolve(vrm)
     })
   })