From b017949c4b37acbfea90fdd5641dbdceaee688a7 Mon Sep 17 00:00:00 2001
From: lepelog <25211966+lepelog@users.noreply.github.com>
Date: Sat, 13 Dec 2025 01:23:37 +0100
Subject: d_t_mass_obj 99%

---
 include/egg/math/eggQuat.h   | 22 ++++++++++++++++++++++
 include/egg/math/eggVector.h |  7 +++++++
 2 files changed, 29 insertions(+)

(limited to 'include/egg/math')

diff --git a/include/egg/math/eggQuat.h b/include/egg/math/eggQuat.h
index a752b229..96808c56 100644
--- a/include/egg/math/eggQuat.h
+++ b/include/egg/math/eggQuat.h
@@ -44,10 +44,26 @@ struct Quatf {
     Vector3f rotateVector(const Vector3f &);
     Vector3f rotateVectorInv(const Vector3f &); // not in SS
     void slerpTo(const Quatf &, f32, Quatf &out) const;
+    void slerpTo2(f32 fparam,const Quatf & param1, Quatf &out ) const {
+        const Quatf & tmp = param1;
+        slerpTo(tmp, fparam, out);
+    }
     void limitSlerpTo(const Quatf &, f32, f32, Quatf &out) const;
     void makeVectorRotationLimit(Vector3f &, Vector3f &, f32); // not in SS
     void makeVectorRotation(const Vector3f &, const Vector3f &);
 
+    // not sure about the name
+    f32 dot(const Quatf& other) const {
+        f32 ret = v.dot(other.v);
+        ret += w * other.w;
+        return ret;
+    }
+
+    void set(const Quatf& other) {
+        v.set(other.v);
+        w = other.w;
+    }
+
     void multScalar(f32 s) {
         w *= s;
         v.x *= s;
@@ -58,6 +74,12 @@ struct Quatf {
         set(1.0f, 0.0f, 0.0f, 0.0f);
     }
 
+    void makeWPositive() {
+        if (w < 0.f) {
+            multScalar(-1.f);
+        }
+    }
+
     Vector3f v;
     f32 w;
 };
diff --git a/include/egg/math/eggVector.h b/include/egg/math/eggVector.h
index abcf1176..8886a45a 100644
--- a/include/egg/math/eggVector.h
+++ b/include/egg/math/eggVector.h
@@ -1,11 +1,14 @@
 #ifndef EGG_VECTOR_H
 #define EGG_VECTOR_H
 
+#include "JSystem/JMath/JMath.h"
 #include "common.h"
 #include "egg/math/eggMath.h"
+#include "nw4r/math/math_arithmetic.h"
 #include "nw4r/math/math_triangular.h"
 
 #include "nw4r/math.h"
+#include <cmath>
 
 namespace EGG {
 
@@ -132,6 +135,10 @@ struct Vector3f : public nw4r::math::VEC3 {
         return squaredLength() <= Math<f32>::epsilon();
     }
 
+    bool isZero2() const {
+        return fabsf(JMathInlineVEC::C_VECSquareMag(*this)) <= Math<f32>::epsilon();
+    }
+
     void setZero() {
         x = y = z = 0.0f;
     }
-- 
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