diff --git a/src/common/models/model.cpp b/src/common/models/model.cpp
index c4b184f0c..377de6117 100644
--- a/src/common/models/model.cpp
+++ b/src/common/models/model.cpp
@@ -151,7 +151,7 @@ int ModelFrameHash(FSpriteModelFrame * smf)
 //
 //===========================================================================
 
-unsigned FindModel(const char * path, const char * modelfile)
+unsigned FindModel(const char * path, const char * modelfile, bool silent)
 {
 	FModel * model = nullptr;
 	FString fullname;
diff --git a/src/common/models/model.h b/src/common/models/model.h
index 025bb2329..3f613d6f4 100644
--- a/src/common/models/model.h
+++ b/src/common/models/model.h
@@ -83,6 +83,7 @@ public:
 	IModelVertexBuffer *GetVertexBuffer(int type) const { return mVBuf[type]; }
 	void DestroyVertexBuffer();
 
+	bool hasSurfaces = false;
 	FString mFileName;
 
 private:
@@ -90,5 +91,5 @@ private:
 };
 
 int ModelFrameHash(FSpriteModelFrame* smf);
-unsigned FindModel(const char* path, const char* modelfile);
+unsigned FindModel(const char* path, const char* modelfile, bool silent = false);
 
diff --git a/src/common/models/models_md3.cpp b/src/common/models/models_md3.cpp
index 512794293..e716a6f26 100644
--- a/src/common/models/models_md3.cpp
+++ b/src/common/models/models_md3.cpp
@@ -133,6 +133,7 @@ bool FMD3Model::Load(const char * path, int lumpnum, const char * buffer, int le
 
 	auto numFrames = LittleLong(hdr->Num_Frames);
 	auto numSurfaces = LittleLong(hdr->Num_Surfaces);
+	hasSurfaces = numSurfaces > 1;
 
 	numTags = LittleLong(hdr->Num_Tags);
 
diff --git a/src/common/models/models_obj.cpp b/src/common/models/models_obj.cpp
index 5d6892798..a79caa9e4 100644
--- a/src/common/models/models_obj.cpp
+++ b/src/common/models/models_obj.cpp
@@ -222,6 +222,8 @@ bool FOBJModel::Load(const char* fn, int lumpnum, const char* buffer, int length
 	curSurface->faceStart = aggSurfFaceCount;
 	surfaces.Push(*curSurface);
 	delete curSurface;
+	hasSurfaces = surfaces.Size() > 1;
+
 
 	if (uvs.Size() == 0)
 	{ // Needed so that OBJs without UVs can work
diff --git a/src/common/models/models_ue1.cpp b/src/common/models/models_ue1.cpp
index 416f9a391..70245bc45 100644
--- a/src/common/models/models_ue1.cpp
+++ b/src/common/models/models_ue1.cpp
@@ -48,6 +48,7 @@ float unpackuvert( uint32_t n, int c )
 bool FUE1Model::Load( const char *filename, int lumpnum, const char *buffer, int length )
 {
 	int lumpnum2;
+	hasSurfaces = true;
 	FString realfilename = fileSystem.GetFileFullName(lumpnum);
 	if ( (size_t)realfilename.IndexOf("_d.3d") == realfilename.Len()-5 )
 	{
diff --git a/src/common/models/voxels.h b/src/common/models/voxels.h
index 7d02bba13..52299434a 100644
--- a/src/common/models/voxels.h
+++ b/src/common/models/voxels.h
@@ -4,7 +4,10 @@
 #include <stdint.h>
 // [RH] Voxels from Build
 
-#define MAXVOXMIPS 5
+enum
+{
+	MAXVOXMIPS = 5,
+};
 
 struct kvxslab_t
 {
diff --git a/src/common/utility/geometry.h b/src/common/utility/geometry.h
index ff8d9ddf1..cbe0fc72d 100644
--- a/src/common/utility/geometry.h
+++ b/src/common/utility/geometry.h
@@ -51,12 +51,6 @@ inline double PointOnLineSide(double x, double y, double linex, double liney, do
 	return (x - linex) * deltay - (y - liney) * deltax;
 }
 
-template<class T>
-inline double PointOnLineSide(const TVector2<T>& pos, const TVector2<T>& linestart, const TVector2<T>& lineend)
-{
-	return (pos.X - linestart.X) * (lineend.Y - linestart.Y) - (pos.Y - linestart.Y) * (lineend.X - linestart.X);
-}
-
 //==========================================================================
 //
 // 
@@ -146,8 +140,11 @@ inline double InterceptLineSegments(double v2x, double v2y, double v2dx, double
 {
 	double den = v1dy * v2dx - v1dx * v2dy;
 
-	if (den == 0 || (forcansee && den < 0)) // cansee does this added check here, aside from that its logic is virtually the same.
-		return 0;		// parallel
+	if (den == 0)
+		return -2 * (double)FLT_MAX;		// parallel (return a magic value different from everything else, just in case it needs to be handled)
+
+	if (forcansee && den < 0)  // cansee does this added check here, aside from that its logic is virtually the same.
+		return -1;		// hitting the backside
 
 	// perform the division first for better parallelization.
 	den = 1 / den;
@@ -175,3 +172,63 @@ inline double LinePlaneIntersect(const DVector3& start, const DVector3& trace, c
 	return (dist - dotStart) / dotTrace; // we are only interested in the factor
 }
 
+//==========================================================================
+//
+// BoxOnLineSide
+//
+// Based on Doom's, but rewritten to be standalone
+// 
+//==========================================================================
+
+inline int BoxOnLineSide(const DVector2& boxtl, const DVector2& boxbr, const DVector2& start, const DVector2& delta)
+{
+	int p1;
+	int p2;
+
+	if (delta.X == 0)
+	{
+		p1 = boxbr.X < start.X;
+		p2 = boxtl.X < start.X;
+		if (delta.Y < 0)
+		{
+			p1 ^= 1;
+			p2 ^= 1;
+		}
+	}
+	else if (delta.Y == 0)
+	{
+		p1 = boxtl.Y > start.Y;
+		p2 = boxbr.Y > start.Y;
+		if (delta.X < 0)
+		{
+			p1 ^= 1;
+			p2 ^= 1;
+		}
+	}
+	else if (delta.X * delta.Y <= 0)
+	{
+		p1 = PointOnLineSide(boxtl.X, boxtl.Y, start.X, start.Y, delta.X, delta.Y) > 0;
+		p2 = PointOnLineSide(boxbr.X, boxbr.Y, start.X, start.Y, delta.X, delta.Y) > 0;
+	}
+	else
+	{
+		p1 = PointOnLineSide(boxbr.X, boxtl.Y, start.X, start.Y, delta.X, delta.Y) > 0;
+		p2 = PointOnLineSide(boxtl.X, boxbr.Y, start.X, start.Y, delta.X, delta.Y) > 0;
+	}
+
+	return (p1 == p2) ? p1 : -1;
+}
+
+//==========================================================================
+//
+// BoxInRange
+//
+//==========================================================================
+
+inline bool BoxInRange(const DVector2& boxtl, const DVector2& boxbr, const DVector2& start, const DVector2& end)
+{
+	return boxtl.X < max(start.X, end.X) &&
+		boxbr.X > min(start.X, end.X) &&
+		boxtl.Y < max(start.Y, end.Y) &&
+		boxbr.Y > min(start.Y, end.Y);
+}
diff --git a/src/common/utility/i_time.cpp b/src/common/utility/i_time.cpp
index a901a66ae..d9117d8ea 100644
--- a/src/common/utility/i_time.cpp
+++ b/src/common/utility/i_time.cpp
@@ -68,7 +68,7 @@ static uint64_t GetClockTimeNS()
 {
 	auto tp = GetTimePoint() - StartupTimeNS;
 	if (TimeScale == 1.0) return tp;
-	else return tp / 1000 * TimeScale * 1000;
+	else return uint64_t(tp / 1000 * TimeScale * 1000);
 }
 
 static uint64_t MSToNS(unsigned int ms)
diff --git a/src/common/utility/m_fixed.h b/src/common/utility/m_fixed.h
index bf7778e79..09d297693 100644
--- a/src/common/utility/m_fixed.h
+++ b/src/common/utility/m_fixed.h
@@ -7,7 +7,6 @@
 
 
 __forceinline constexpr int32_t MulScale(int32_t a, int32_t b, int32_t shift) { return (int32_t)(((int64_t)a * b) >> shift); }
-__forceinline constexpr double MulScaleF(double a, double b, int32_t shift) { return (a * b) * (1. / (uint32_t(1) << shift)); }
 __forceinline constexpr int32_t DMulScale(int32_t a, int32_t b, int32_t c, int32_t d, int32_t shift) { return (int32_t)(((int64_t)a * b + (int64_t)c * d) >> shift); }
 __forceinline constexpr int32_t DivScale(int32_t a, int32_t b, int shift) { return (int32_t)(((int64_t)a << shift) / b); }
 __forceinline constexpr int64_t DivScaleL(int64_t a, int64_t b, int shift) { return ((a << shift) / b); }
diff --git a/src/common/utility/tarray.h b/src/common/utility/tarray.h
index 181a9e939..dbd63002b 100644
--- a/src/common/utility/tarray.h
+++ b/src/common/utility/tarray.h
@@ -332,7 +332,7 @@ public:
 
 	unsigned IndexOf(const T* elem) const
 	{
-		return elem - Array;
+		return unsigned(elem - Array);
 	}
 
     unsigned int Find(const T& item) const
diff --git a/src/common/utility/vectors.h b/src/common/utility/vectors.h
index e65e69607..661acd742 100644
--- a/src/common/utility/vectors.h
+++ b/src/common/utility/vectors.h
@@ -271,6 +271,19 @@ struct TVector2
 		return *this;
 	}
 
+	TVector2 Resized(double len) const
+	{
+		double vlen = Length();
+		if (vlen != 0.)
+		{
+			double scale = len / vlen;
+			return{ vec_t(X * scale), vec_t(Y * scale) };
+		}
+		else
+		{
+			return *this;
+		}
+	}
 
 	// Dot product
 	vec_t operator | (const TVector2 &other) const
@@ -644,7 +657,7 @@ struct TVector3
 		return *this;
 	}
 
-	TVector3 Resized(double len)
+	TVector3 Resized(double len) const
 	{
 		double vlen = Length();
 		if (vlen != 0.)
@@ -974,7 +987,7 @@ struct TVector4
 		return *this;
 	}
 
-	TVector4 Resized(double len)
+	TVector4 Resized(double len) const 
 	{
 		double vlen = Length();
 		if (vlen != 0.)
@@ -1287,12 +1300,7 @@ public:
 		return TAngle(f * (90. / 0x40000000));
 	}
 
-	static constexpr TAngle fromBuild(int bang)
-	{
-		return TAngle(bang * (90. / 512));
-	}
-
-	static constexpr TAngle fromBuildf(double bang)
+	static constexpr TAngle fromBuild(double bang)
 	{
 		return TAngle(bang * (90. / 512));
 	}
@@ -1349,6 +1357,11 @@ public:
 		return Degrees_ * other;
 	}
 
+	constexpr TAngle operator* (TAngle other) const
+	{
+		return Degrees_ * other.Degrees_;
+	}
+
 	constexpr TAngle operator/ (vec_t other) const
 	{
 		return Degrees_ / other;
@@ -1736,6 +1749,7 @@ constexpr DAngle minAngle = DAngle::fromDeg(1. / 65536.);
 constexpr FAngle nullFAngle = FAngle::fromDeg(0.);
 
 constexpr DAngle DAngle1 = DAngle::fromDeg(1);
+constexpr DAngle DAngle15 = DAngle::fromDeg(15);
 constexpr DAngle DAngle22_5 = DAngle::fromDeg(22.5);
 constexpr DAngle DAngle45 = DAngle::fromDeg(45);
 constexpr DAngle DAngle60 = DAngle::fromDeg(60);