From b9d921b533e473a7df239d4f5683bc8aef804e76 Mon Sep 17 00:00:00 2001
From: Human Gamer <39096122+HumanGamer@users.noreply.github.com>
Date: Mon, 4 Mar 2024 20:32:36 -0600
Subject: [PATCH] Fixed item rotation from TrenchBroom for Interior Test

---
 engine/source/interior/interiorInstance.cpp | 10 ++----
 engine/source/math/mMatrix.h                | 39 +++++++++++++++++++++
 2 files changed, 42 insertions(+), 7 deletions(-)

diff --git a/engine/source/interior/interiorInstance.cpp b/engine/source/interior/interiorInstance.cpp
index 2c5b002e..97f4c76a 100644
--- a/engine/source/interior/interiorInstance.cpp
+++ b/engine/source/interior/interiorInstance.cpp
@@ -1428,9 +1428,7 @@ void InteriorInstance::addChildren()
                 {
                     if (dStricmp(entry.name, "angles") == 0)
                     {
-                        // TrenchBroom uses X, -Z, Y. Torque uses X, Y, Z
-                        dSscanf(entry.value, "%g %g %g", &angles.x, &angles.z, &angles.y);
-                        angles.z *= -1; // flipped in trench broom
+                        dSscanf(entry.value, "%g %g %g", &angles.x, &angles.y, &angles.z);
                     }
                     else
                     {
@@ -1446,10 +1444,8 @@ void InteriorInstance::addChildren()
                 angles.y = mDegToRad(angles.y);
                 angles.z = mDegToRad(angles.z);
 
-                MatrixF rotMat(angles);
-
-                //AngAxisF rot(Point3F(0.0f, 0.0f, 1.0f), mDegToRad(angle));
-                //rot.setMatrix(&rotMat);
+                MatrixF rotMat(true);
+                rotMat.setEulerFromTrenchbroom(angles);
 
                 MatrixF trans = this->getTransform();
                 trans.mulP(origin);
diff --git a/engine/source/math/mMatrix.h b/engine/source/math/mMatrix.h
index 55d07e7a..58395dc9 100644
--- a/engine/source/math/mMatrix.h
+++ b/engine/source/math/mMatrix.h
@@ -44,6 +44,8 @@ class MatrixF
     /// Initialize matrix to rotate about origin by e.
     MatrixF& set(const EulerF& e);
 
+    MatrixF& setEulerFromTrenchbroom(const EulerF& e);
+
     /// Initialize matrix to rotate about p by e.
     MatrixF& set(const EulerF& e, const Point3F& p);
 
@@ -188,6 +190,43 @@ inline MatrixF& MatrixF::set(const EulerF& e)
     return (*this);
 }
 
+inline MatrixF& MatrixF::setEulerFromTrenchbroom(const EulerF& e)
+{
+    auto pitch = e.x;
+    auto yaw = e.y;
+    auto roll = e.z;
+
+    constexpr auto I = 1.0f;
+    constexpr auto O = 0.0f;
+
+    const auto Cr = mCos(roll);
+    const auto Sr = mSin(roll);
+    MatrixF R;
+    R.m[0] = +I; R.m[1] = +O; R.m[2] = +O; R.m[3] = +O;
+    R.m[4] = +O; R.m[5] = +Cr; R.m[6] = -Sr; R.m[7] = +O;
+    R.m[8] = +O; R.m[9] = +Sr; R.m[10] = +Cr; R.m[11] = +O;
+    R.m[12] = +O; R.m[13] = +O; R.m[14] = +O; R.m[15] = +I;
+
+    const auto Cp = mCos(pitch);
+    const auto Sp = mSin(pitch);
+    MatrixF P;
+    P.m[0] = +Cp; P.m[1] = +O; P.m[2] = +Sp; P.m[3] = +O;
+    P.m[4] = +O; P.m[5] = +I; P.m[6] = +O; P.m[7] = +O;
+    P.m[8] = -Sp; P.m[9] = +O; P.m[10] = +Cp; P.m[11] = +O;
+    P.m[12] = +O; P.m[13] = +O; P.m[14] = +O; P.m[15] = +I;
+
+    const auto Cy = mCos(yaw);
+    const auto Sy = mSin(yaw);
+    MatrixF Y;
+    Y.m[0] = +Cy; Y.m[1] = -Sy; Y.m[2] = +O; Y.m[3] = +O;
+    Y.m[4] = +Sy; Y.m[5] = +Cy; Y.m[6] = +O; Y.m[7] = +O;
+    Y.m[8] = +O; Y.m[9] = +O; Y.m[10] = +I; Y.m[11] = +O;
+    Y.m[12] = +O; Y.m[13] = +O; Y.m[14] = +O; Y.m[15] = +I;
+
+    *this = Y * P * R;
+
+    return (*this);
+}
 
 inline MatrixF& MatrixF::set(const EulerF& e, const Point3F& p)
 {