4 files changed, 100 insertions, 3 deletions
diff --git a/indra/llappearance/CMakeLists.txt b/indra/llappearance/CMakeLists.txt
index f3f822f61c..b382e21b3c 100644
--- a/indra/llappearance/CMakeLists.txt
+++ b/indra/llappearance/CMakeLists.txt
@@ -14,6 +14,7 @@ set(llappearance_SOURCE_FILES
     llavatarjoint.cpp
     llavatarjointmesh.cpp
     lldriverparam.cpp
+    lljointdata.h
     lllocaltextureobject.cpp
     llpolyskeletaldistortion.cpp
     llpolymesh.cpp
diff --git a/indra/llappearance/llavatarappearance.cpp b/indra/llappearance/llavatarappearance.cpp
index 3d66809ed6..13bea1e5ea 100644
--- a/indra/llappearance/llavatarappearance.cpp
+++ b/indra/llappearance/llavatarappearance.cpp
@@ -29,16 +29,17 @@
 #include "llavatarappearance.h"
 #include "llavatarappearancedefines.h"
 #include "llavatarjointmesh.h"
+#include "lljointdata.h"
 #include "llstl.h"
 #include "lldir.h"
 #include "llpolymorph.h"
 #include "llpolymesh.h"
 #include "llpolyskeletaldistortion.h"
-#include "llstl.h"
 #include "lltexglobalcolor.h"
 #include "llwearabledata.h"
 #include "boost/bind.hpp"
 #include "boost/tokenizer.hpp"
+#include "v4math.h"
 
 using namespace LLAvatarAppearanceDefines;
 
@@ -71,6 +72,7 @@ public:
         mChildren.clear();
     }
     bool parseXml(LLXmlTreeNode* node);
+    glm::mat4 getJointMatrix();
 
 private:
     std::string mName;
@@ -106,10 +108,16 @@ public:
     S32 getNumCollisionVolumes() const { return mNumCollisionVolumes; }
 
 private:
+    typedef std::vector<LLAvatarBoneInfo*> bone_info_list_t;
+    static void getJointMatricesAndHierarhy(
+        LLAvatarBoneInfo* bone_info,
+        LLJointData& data,
+        const glm::mat4& parent_mat);
+
+private:
     S32 mNumBones;
     S32 mNumCollisionVolumes;
     LLAvatarAppearance::joint_alias_map_t mJointAliasMap;
-    typedef std::vector<LLAvatarBoneInfo*> bone_info_list_t;
     bone_info_list_t mBoneInfoList;
 };
 
@@ -1623,6 +1631,21 @@ bool LLAvatarBoneInfo::parseXml(LLXmlTreeNode* node)
     return true;
 }
 
+
+glm::mat4 LLAvatarBoneInfo::getJointMatrix()
+{
+    glm::mat4 mat(1.0f);
+    // 1. Scaling
+    mat = glm::scale(mat, glm::vec3(mScale[0], mScale[1], mScale[2]));
+    // 2. Rotation (Euler angles rad)
+    mat = glm::rotate(mat, mRot[0], glm::vec3(1, 0, 0));
+    mat = glm::rotate(mat, mRot[1], glm::vec3(0, 1, 0));
+    mat = glm::rotate(mat, mRot[2], glm::vec3(0, 0, 1));
+    // 3. Position
+    mat = glm::translate(mat, glm::vec3(mPos[0], mPos[1], mPos[2]));
+    return mat;
+}
+
 //-----------------------------------------------------------------------------
 // LLAvatarSkeletonInfo::parseXml()
 //-----------------------------------------------------------------------------
@@ -1653,6 +1676,21 @@ bool LLAvatarSkeletonInfo::parseXml(LLXmlTreeNode* node)
     return true;
 }
 
+void LLAvatarSkeletonInfo::getJointMatricesAndHierarhy(
+    LLAvatarBoneInfo* bone_info,
+    LLJointData& data,
+    const glm::mat4& parent_mat)
+{
+    data.mName = bone_info->mName;
+    data.mJointMatrix = bone_info->getJointMatrix();
+    data.mRestMatrix = parent_mat * data.mJointMatrix;
+    for (LLAvatarBoneInfo* child_info : bone_info->mChildren)
+    {
+        LLJointData& child_data = data.mChildren.emplace_back();
+        getJointMatricesAndHierarhy(child_info, child_data, data.mRestMatrix);
+    }
+}
+
 //Make aliases for joint and push to map.
 void LLAvatarAppearance::makeJointAliases(LLAvatarBoneInfo *bone_info)
 {
@@ -1714,6 +1752,16 @@ const LLAvatarAppearance::joint_alias_map_t& LLAvatarAppearance::getJointAliases
     return mJointAliasMap;
 }
 
+void LLAvatarAppearance::getJointMatricesAndHierarhy(std::vector<LLJointData> &data) const
+{
+    glm::mat4 identity(1.f);
+    for (LLAvatarBoneInfo* bone_info : sAvatarSkeletonInfo->mBoneInfoList)
+    {
+        LLJointData& child_data = data.emplace_back();
+        LLAvatarSkeletonInfo::getJointMatricesAndHierarhy(bone_info, child_data, identity);
+    }
+}
+
 
 //-----------------------------------------------------------------------------
 // parseXmlSkeletonNode(): parses <skeleton> nodes from XML tree
diff --git a/indra/llappearance/llavatarappearance.h b/indra/llappearance/llavatarappearance.h
index 13e504e639..2748da9a1d 100644
--- a/indra/llappearance/llavatarappearance.h
+++ b/indra/llappearance/llavatarappearance.h
@@ -34,6 +34,7 @@
 #include "lltexlayer.h"
 #include "llviewervisualparam.h"
 #include "llxmltree.h"
+#include "v4math.h"
 
 class LLTexLayerSet;
 class LLTexGlobalColor;
@@ -41,6 +42,7 @@ class LLTexGlobalColorInfo;
 class LLWearableData;
 class LLAvatarBoneInfo;
 class LLAvatarSkeletonInfo;
+class LLJointData;
 
 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 // LLAvatarAppearance
@@ -153,7 +155,9 @@ public:
     const avatar_joint_list_t& getSkeleton() { return mSkeleton; }
     typedef std::map<std::string, std::string> joint_alias_map_t;
     const joint_alias_map_t& getJointAliases();
-
+    typedef std::map<std::string, std::string> joint_parent_map_t; // matrix plus parent
+    typedef std::map<std::string, glm::mat4> joint_rest_map_t;
+    void getJointMatricesAndHierarhy(std::vector<LLJointData> &data) const;
 
 protected:
     static bool         parseSkeletonFile(const std::string& filename, LLXmlTree& skeleton_xml_tree);
diff --git a/indra/llappearance/lljointdata.h b/indra/llappearance/lljointdata.h
new file mode 100644
index 0000000000..549f4af041
--- /dev/null
+++ b/indra/llappearance/lljointdata.h
@@ -0,0 +1,44 @@
+/**
+ * @file lljointdata.h
+ * @brief LLJointData class for holding individual joint data and skeleton
+ *
+ * $LicenseInfo:firstyear=2025&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2025, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLJOINTDATA_H
+#define LL_LLJOINTDATA_H
+
+#include "v4math.h"
+
+// may be just move LLAvatarBoneInfo
+class LLJointData
+{
+public:
+    std::string mName;
+    glm::mat4 mJointMatrix;
+    glm::mat4 mRestMatrix;
+
+    typedef std::vector<LLJointData> bones_t;
+    bones_t mChildren;
+};
+
+#endif //LL_LLJOINTDATA_H