From c404b9375923e0e4260536329b3da7d566a2d259 Mon Sep 17 00:00:00 2001
From: Andrey Kleshchev <andreykproductengine@lindenlab.com>
Date: Tue, 24 Jun 2025 17:07:42 +0300
Subject: #4148 Fix collision bones

---
 indra/llprimitive/llmodelloader.cpp | 52 +++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

(limited to 'indra/llprimitive/llmodelloader.cpp')

diff --git a/indra/llprimitive/llmodelloader.cpp b/indra/llprimitive/llmodelloader.cpp
index 8f86b90b69..f97ac16a83 100644
--- a/indra/llprimitive/llmodelloader.cpp
+++ b/indra/llprimitive/llmodelloader.cpp
@@ -468,6 +468,58 @@ bool LLModelLoader::isRigSuitableForJointPositionUpload( const std::vector<std::
     return true;
 }
 
+void LLModelLoader::dumpDebugData()
+{
+    std::string log_file = mFilename + "_importer.txt";
+    LLStringUtil::toLower(log_file);
+    llofstream file;
+    file.open(log_file.c_str());
+    if (!file)
+    {
+        LL_WARNS() << "dumpDebugData failed to open file " << log_file << LL_ENDL;
+        return;
+    }
+    file << "Importing: " << mFilename << "\n";
+
+    std::map<std::string, LLMatrix4a> inv_bind;
+    std::map<std::string, LLMatrix4a> alt_bind;
+    for (LLPointer<LLModel>& mdl : mModelList)
+    {
+
+        file << "Model name: " << mdl->mLabel << "\n";
+        const LLMeshSkinInfo& skin_info = mdl->mSkinInfo;
+        file << "Shape Bind matrix: " << skin_info.mBindShapeMatrix << "\n";
+        file << "Skin Weights count: " << (S32)mdl->mSkinWeights.size() << "\n";
+
+        // some objects might have individual bind matrices,
+        // but for now it isn't accounted for
+        size_t joint_count = skin_info.mJointNames.size();
+        for (size_t i = 0; i< joint_count;i++)
+        {
+            const std::string& joint = skin_info.mJointNames[i];
+            if (skin_info.mInvBindMatrix.size() > i)
+            {
+                inv_bind[joint] = skin_info.mInvBindMatrix[i];
+            }
+            if (skin_info.mAlternateBindMatrix.size() > i)
+            {
+                alt_bind[joint] = skin_info.mAlternateBindMatrix[i];
+            }
+        }
+    }
+
+    file << "Inv Bind matrices.\n";
+    for (auto& bind : inv_bind)
+    {
+        file << "Joint: " << bind.first << " Matrix: " << bind.second << "\n";
+    }
+
+    file << "Alt Bind matrices.\n";
+    for (auto& bind : alt_bind)
+    {
+        file << "Joint: " << bind.first << " Matrix: " << bind.second << "\n";
+    }
+}
 
 //called in the main thread
 void LLModelLoader::loadTextures()
-- 
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