From f66454e47db8d758f995cc2ecd637c02a63e902d Mon Sep 17 00:00:00 2001
From: AzaezelX <quillus@hotmail.com>
Date: Sun, 3 May 2026 22:50:52 -0500
Subject: [PATCH] adds a pathshape useEase value.-on by default. camerasplines
 in general previously assumed you would always want to ease in and out at the
 first and final node. even when looping. adds an mUsease to it, and to
 pathshapedata to optionally shut that off. (on by default to behave as
 legacy)

---
 Engine/source/T3D/cameraSpline.cpp |  3 ++-
 Engine/source/T3D/cameraSpline.h   | 10 +++++-----
 Engine/source/T3D/pathShape.cpp    | 11 +++++++----
 Engine/source/T3D/pathShape.h      |  1 +
 4 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/Engine/source/T3D/cameraSpline.cpp b/Engine/source/T3D/cameraSpline.cpp
index 6c1950cd2..d0537b8db 100644
--- a/Engine/source/T3D/cameraSpline.cpp
+++ b/Engine/source/T3D/cameraSpline.cpp
@@ -71,6 +71,7 @@ CameraSpline::CameraSpline()
    mFront = NULL;
    mSize = 0;
    mIsMapDirty = true;
+   mUseEase = true;
    VECTOR_SET_ASSOCIATION(mTimeMap);
 }
 
@@ -296,7 +297,7 @@ F32 CameraSpline::getTime(F32 d)
 void CameraSpline::value(F32 t, CameraSpline::Knot *result, bool skip_rotation)
 {
    // Do some easing in and out for t.
-   if(!gBuilding)
+   if(!gBuilding && mUseEase)
    {
       F32 oldT = t;
       if(oldT < 0.5f)
diff --git a/Engine/source/T3D/cameraSpline.h b/Engine/source/T3D/cameraSpline.h
index b949701bd..aa9d3152e 100644
--- a/Engine/source/T3D/cameraSpline.h
+++ b/Engine/source/T3D/cameraSpline.h
@@ -76,8 +76,8 @@ public:
    void push_front(Knot *w) { push_back(w); mFront = w; mIsMapDirty = true; }
 
    Knot* getKnot(S32 i);
-   Knot* next(Knot *k) { return (k && k->next == mFront) ? k : k->next; }
-   Knot* prev(Knot *k) { return (k && k == mFront) ? k : k->prev; }
+   Knot* next(Knot *k) { return (k && k->next != mFront) ? k->next : mFront; }
+   Knot* prev(Knot *k) { return (k && k->prev != mFront) ? k->prev : mFront; }
 
    F32 advanceTime(F32 t, S32 delta_ms);
    F32 advanceDist(F32 t, F32 meters);
@@ -85,7 +85,7 @@ public:
 
    F32 getDistance(F32 t);
    F32 getTime(F32 d);
-
+   void useEase(bool ease = true) { mUseEase = ease; }
    void renderTimeMap();
 
 
@@ -93,7 +93,7 @@ private:
    Knot *mFront;
    S32 mSize;
    bool mIsMapDirty;
-
+   bool mUseEase;
    struct TimeMap {
       F32 mTime;
       F32 mDistance;
@@ -106,4 +106,4 @@ private:
 
 
 
-#endif
\ No newline at end of file
+#endif
diff --git a/Engine/source/T3D/pathShape.cpp b/Engine/source/T3D/pathShape.cpp
index 1a903e555..9370c09e5 100644
--- a/Engine/source/T3D/pathShape.cpp
+++ b/Engine/source/T3D/pathShape.cpp
@@ -46,16 +46,20 @@ void PathShapeData::initPersistFields()
 {
    docsURL;
    Parent::initPersistFields();
+   addField("useEase", TypeBool, Offset(mUseEase, PathShapeData), "Whether to use ease in and out when moving along the path.\n");
+
 }
 
 void PathShapeData::packData(BitStream* stream)
 {
    Parent::packData(stream);
+   stream->writeFlag(mUseEase);
 }
 
 void PathShapeData::unpackData(BitStream* stream)
 {
    Parent::unpackData(stream);
+   mUseEase = stream->readFlag();
 }
 
 
@@ -109,7 +113,7 @@ bool PathShape::onAdd()
          CameraSpline::Knot::NORMAL, CameraSpline::Knot::SPLINE));
       mNodeCount = 1;
    }
-
+   mSpline.useEase(mDataBlock->mUseEase);
    if (isServerObject()) scriptOnAdd();
    return true;
 
@@ -135,6 +139,7 @@ bool PathShape::onNewDataBlock(GameBaseData* dptr, bool reload)
       return false;
 
    scriptOnNewDataBlock(reload);
+   mSpline.useEase(mDataBlock->mUseEase);
    return true;
 }
 
@@ -152,9 +157,7 @@ void PathShape::initPersistFields()
    addField( "Path", TYPEID< SimObjectRef<SimPath::Path> >(), Offset( mSimPath, PathShape ),
          "@brief Name of a Path to follow." );
 
-   addField("Controler", TypeString, Offset(mControl, PathShape), 4, "controlers");
-
-   Parent::initPersistFields();
+   addField("Controler", TypeString, Offset(mControl, PathShape), 4, "controlers");   Parent::initPersistFields();
 
 }
 
diff --git a/Engine/source/T3D/pathShape.h b/Engine/source/T3D/pathShape.h
index d9522632b..c491cdbc1 100644
--- a/Engine/source/T3D/pathShape.h
+++ b/Engine/source/T3D/pathShape.h
@@ -30,6 +30,7 @@ struct PathShapeData: public StaticShapeData {
    static void initPersistFields();
    void packData(BitStream* stream) override;
    void unpackData(BitStream* stream) override;
+   bool mUseEase;
 };