From d092f3e1dc1c322a0c3c1e55b9b6e1792d6b0f59 Mon Sep 17 00:00:00 2001
From: "Jonathan \"Geenz\" Goodman" <geenz@geenzo.com>
Date: Mon, 25 Sep 2023 12:18:02 -0700
Subject: Get the average normal of the face.

DRTVWR-583
---
 indra/newview/llface.cpp             | 27 +++++++++++++++++++++++++++
 indra/newview/llface.h               |  5 +++++
 indra/newview/llheroprobemanager.cpp | 10 ++++++++++
 3 files changed, 42 insertions(+)

diff --git a/indra/newview/llface.cpp b/indra/newview/llface.cpp
index c1776705f9..4dd991ee60 100644
--- a/indra/newview/llface.cpp
+++ b/indra/newview/llface.cpp
@@ -488,6 +488,33 @@ U16 LLFace::getGeometry(LLStrider<LLVector3> &vertices, LLStrider<LLVector3> &no
 	return mGeomIndex;
 }
 
+LLVector3 LLFace::getAverageNormal()
+{
+    if (!mHasAverageNormal)
+    {
+        if (mVertexBuffer.notNull())
+        {
+            if (mVertexBuffer->hasDataType(LLVertexBuffer::TYPE_NORMAL))
+            {
+                LLStrider<LLVector3> normals;
+                mVertexBuffer->getNormalStrider(normals, mGeomIndex, mGeomCount);
+                LLVector3 normal_total;
+                
+                for (int i = 0; i < mVertexBuffer->getNumVerts(); i++)
+                {
+                    normal_total += *normals.get();
+                    normals++;
+                }
+                
+                mAverageNormal = normal_total / mVertexBuffer->getNumVerts();
+                mHasAverageNormal = true;
+            }
+        }
+    }
+    
+    return mAverageNormal;
+}
+
 void LLFace::updateCenterAgent()
 {
 	if (mDrawablep->isActive())
diff --git a/indra/newview/llface.h b/indra/newview/llface.h
index eb3b47d6d6..d4f4313073 100644
--- a/indra/newview/llface.h
+++ b/indra/newview/llface.h
@@ -176,6 +176,8 @@ public:
 								LLStrider<LLVector3> &normals,
 								LLStrider<LLVector2> &texCoords, 
 								LLStrider<U16>  &indices);
+    
+    LLVector3       getAverageNormal();
 
 	S32 getColors(LLStrider<LLColor4U> &colors);
 	S32 getIndices(LLStrider<U16> &indices);
@@ -278,6 +280,9 @@ private:
 	U32			mIndicesCount;
 	U32			mIndicesIndex;		// index into mVertexBuffer's index array
 	S32         mIndexInTex[LLRender::NUM_TEXTURE_CHANNELS];
+    
+    LLVector3   mAverageNormal;
+    bool        mHasAverageNormal;
 
 	LLXformMatrix* mXform;
 
diff --git a/indra/newview/llheroprobemanager.cpp b/indra/newview/llheroprobemanager.cpp
index 687ebbf168..c3d7ce6e76 100644
--- a/indra/newview/llheroprobemanager.cpp
+++ b/indra/newview/llheroprobemanager.cpp
@@ -118,11 +118,20 @@ void LLHeroProbeManager::update()
                 F32 angleInRadians = 180 * DEG_TO_RAD;
 
                 LLMatrix4 rotationMatrix;
+                
+                rotationMatrix.rotate(angleInRadians, LLVector4(mNearestHero->mDrawable->getFace(0)->getAverageNormal()));
 
                 LLVector3 translatedPoint;
                 LLVector3 rotatedTranslatedPoint;
                 LLVector3 rotatedPoint;
                 
+                translatedPoint = camera_pos - hero_pos;
+                rotatedTranslatedPoint = translatedPoint * rotationMatrix;
+                rotatedPoint = rotatedTranslatedPoint + hero_pos;
+                
+                probe_pos.load3(rotatedPoint.mV);
+
+                /*
                 switch (mNearestHero->mirrorPlacementMode()) {
                     case 0:
                         
@@ -161,6 +170,7 @@ void LLHeroProbeManager::update()
                         probe_pos.load3(rotatedPoint.mV);
                         break;
                 }
+                 */
             }
             
             mHeroProbeStrength = 1;
-- 
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