diff --git a/src/common/2d/v_2ddrawer.cpp b/src/common/2d/v_2ddrawer.cpp
index bae286b844..debb2a73d2 100644
--- a/src/common/2d/v_2ddrawer.cpp
+++ b/src/common/2d/v_2ddrawer.cpp
@@ -796,19 +796,19 @@ void F2DDrawer::AddPoly(FGameTexture *texture, FVector2 *points, int npoints,
 //
 //==========================================================================
 
-void F2DDrawer::AddPoly(FGameTexture* img, FVector4* vt, size_t vtcount, const unsigned int* ind, size_t idxcount, int translation, PalEntry color, FRenderStyle style, int clipx1, int clipy1, int clipx2, int clipy2)
+void F2DDrawer::AddPoly(FGameTexture* img, FVector4* vt, size_t vtcount, const unsigned int* ind, size_t idxcount, int translation, PalEntry color, FRenderStyle style, const IntRect* clip)
 {
 	RenderCommand dg;
 
 	if (!img || !img->isValid()) return;
 
 	dg.mType = DrawTypeTriangles;
-	if (clipx1 > 0 || clipy1 > 0 || clipx2 < GetWidth() - 1 || clipy2 < GetHeight() - 1)
+	if (clip != nullptr)
 	{
-		dg.mScissor[0] = clipx1     + int(offset.X);
-		dg.mScissor[1] = clipy1     + int(offset.Y);
-		dg.mScissor[2] = clipx2 + 1 + int(offset.X);
-		dg.mScissor[3] = clipy2 + 1 + int(offset.Y);
+		dg.mScissor[0] = clip->Left() + int(offset.X);
+		dg.mScissor[1] = clip->Top() + int(offset.Y);
+		dg.mScissor[2] = clip->Right() + int(offset.X);
+		dg.mScissor[3] = clip->Bottom() + int(offset.Y);
 		dg.mFlags |= DTF_Scissor;
 	}
 
diff --git a/src/common/2d/v_2ddrawer.h b/src/common/2d/v_2ddrawer.h
index 2ac631e5d1..904b66820a 100644
--- a/src/common/2d/v_2ddrawer.h
+++ b/src/common/2d/v_2ddrawer.h
@@ -216,7 +216,7 @@ public:
 	void AddPoly(FGameTexture *texture, FVector2 *points, int npoints,
 		double originx, double originy, double scalex, double scaley,
 		DAngle rotation, const FColormap &colormap, PalEntry flatcolor, double lightlevel, uint32_t *indices, size_t indexcount);
-	void AddPoly(FGameTexture* img, FVector4 *vt, size_t vtcount, const unsigned int *ind, size_t idxcount, int translation, PalEntry color, FRenderStyle style, int clipx1, int clipy1, int clipx2, int clipy2);
+	void AddPoly(FGameTexture* img, FVector4 *vt, size_t vtcount, const unsigned int *ind, size_t idxcount, int translation, PalEntry color, FRenderStyle style, const IntRect* clip);
 	void FillPolygon(int* rx1, int* ry1, int* xb1, int32_t npoints, int picnum, int palette, int shade, int props, const FVector2& xtex, const FVector2& ytex, const FVector2& otex,
 		int clipx1, int clipy1, int clipx2, int clipy2);
 	void AddFlatFill(int left, int top, int right, int bottom, FGameTexture *src, int local_origin = false, double flatscale = 1.0, PalEntry color = 0xffffffff, ERenderStyle rs = STYLE_Normal);
diff --git a/src/common/console/c_commandline.cpp b/src/common/console/c_commandline.cpp
index 4516af4ed5..4f500ffe66 100644
--- a/src/common/console/c_commandline.cpp
+++ b/src/common/console/c_commandline.cpp
@@ -57,17 +57,19 @@
 //							\c becomes just TEXTCOLOR_ESCAPE
 //   $<cvar> is replaced by the contents of <cvar>
 
-static long ParseCommandLine(const char* args, int* argc, char** argv, bool no_escapes)
+static size_t ParseCommandLine(const char* args, int* argc, char** argv, bool no_escapes)
 {
 	int count;
+	char* buffstart;
 	char* buffplace;
 
 	count = 0;
-	buffplace = NULL;
+	buffstart = NULL;
 	if (argv != NULL)
 	{
-		buffplace = argv[0];
+		buffstart = argv[0];
 	}
+	buffplace = buffstart;
 
 	for (;;)
 	{
@@ -154,7 +156,7 @@ static long ParseCommandLine(const char* args, int* argc, char** argv, bool no_e
 	{
 		*argc = count;
 	}
-	return (long)(buffplace - (char*)0);
+	return (buffplace - buffstart);
 }
 
 FCommandLine::FCommandLine (const char *commandline, bool no_escapes)
diff --git a/src/common/console/c_commandline.h b/src/common/console/c_commandline.h
index 88b19cc93b..dc5466df1c 100644
--- a/src/common/console/c_commandline.h
+++ b/src/common/console/c_commandline.h
@@ -50,9 +50,9 @@ public:
 
 private:
 	const char *cmd;
+	bool noescapes;
 	int _argc;
 	char **_argv;
-	long argsize;
-	bool noescapes;
+	size_t argsize;
 };
 
diff --git a/src/common/models/model.cpp b/src/common/models/model.cpp
index 1829ccebbd..21f5c9f41c 100644
--- a/src/common/models/model.cpp
+++ b/src/common/models/model.cpp
@@ -155,12 +155,13 @@ unsigned FindModel(const char * path, const char * modelfile)
 	FModel * model = nullptr;
 	FString fullname;
 
-	fullname.Format("%s%s", path, modelfile);
+	if (path) fullname.Format("%s%s", path, modelfile);
+	else fullname = modelfile;
 	int lump = fileSystem.CheckNumForFullName(fullname);
 
 	if (lump<0)
 	{
-		Printf("FindModel: '%s' not found\n", fullname.GetChars());
+		Printf(PRINT_HIGH, "FindModel: '%s' not found\n", fullname.GetChars());
 		return -1;
 	}
 
@@ -226,7 +227,7 @@ unsigned FindModel(const char * path, const char * modelfile)
 		}
 		else
 		{
-			Printf("LoadModel: Unknown model format in '%s'\n", fullname.GetChars());
+			Printf(PRINT_HIGH, "LoadModel: Unknown model format in '%s'\n", fullname.GetChars());
 			return -1;
 		}
 	}
diff --git a/src/common/models/model.h b/src/common/models/model.h
index 300661d250..edbcc48419 100644
--- a/src/common/models/model.h
+++ b/src/common/models/model.h
@@ -53,6 +53,13 @@ enum ModelRendererType
 	NumModelRendererTypes
 };
 
+enum EFrameError
+{
+	FErr_NotFound = -1,
+	FErr_Voxel = -2,
+	FErr_Singleframe = -3
+};
+
 class FModel
 {
 public:
@@ -60,7 +67,7 @@ public:
 	virtual ~FModel();
 
 	virtual bool Load(const char * fn, int lumpnum, const char * buffer, int length) = 0;
-	virtual int FindFrame(const char * name) = 0;
+	virtual int FindFrame(const char * name, bool nodefault = false) = 0;
 	virtual void RenderFrame(FModelRenderer *renderer, FGameTexture * skin, int frame, int frame2, double inter, int translation, const FTextureID* surfaceskinids) = 0;
 	virtual void BuildVertexBuffer(FModelRenderer *renderer) = 0;
 	virtual void AddSkins(uint8_t *hitlist, const FTextureID* surfaceskinids) = 0;
diff --git a/src/common/models/model_kvx.h b/src/common/models/model_kvx.h
index 4c107db5c6..1491b03b48 100644
--- a/src/common/models/model_kvx.h
+++ b/src/common/models/model_kvx.h
@@ -15,9 +15,9 @@ struct FVoxelVertexHash
 	// Returns the hash value for a key.
 	hash_t Hash(const FModelVertex &key) 
 	{ 
-		int ix = xs_RoundToInt(key.x);		
-		int iy = xs_RoundToInt(key.y);		
-		int iz = xs_RoundToInt(key.z);		
+		int ix = int(key.x);		
+		int iy = int(key.y);		
+		int iz = int(key.z);		
 		return (hash_t)(ix + (iy<<9) + (iz<<18));
 	}
 
@@ -58,7 +58,7 @@ public:
 	~FVoxelModel();
 	bool Load(const char * fn, int lumpnum, const char * buffer, int length) override;
 	void Initialize();
-	virtual int FindFrame(const char * name) override;
+	virtual int FindFrame(const char * name, bool nodefault) override;
 	virtual void RenderFrame(FModelRenderer *renderer, FGameTexture * skin, int frame, int frame2, double inter, int translation, const FTextureID* surfaceskinids) override;
 	virtual void AddSkins(uint8_t *hitlist, const FTextureID* surfaceskinids) override;
 	FTextureID GetPaletteTexture() const { return mPalette; }
diff --git a/src/common/models/model_md2.h b/src/common/models/model_md2.h
index 966a38975c..b1feef645a 100644
--- a/src/common/models/model_md2.h
+++ b/src/common/models/model_md2.h
@@ -112,7 +112,7 @@ public:
 	virtual ~FDMDModel();
 
 	virtual bool Load(const char * fn, int lumpnum, const char * buffer, int length) override;
-	virtual int FindFrame(const char * name) override;
+	virtual int FindFrame(const char * name, bool nodefault) override;
 	virtual void RenderFrame(FModelRenderer *renderer, FGameTexture * skin, int frame, int frame2, double inter, int translation, const FTextureID* surfaceskinids) override;
 	virtual void LoadGeometry();
 	virtual void AddSkins(uint8_t *hitlist, const FTextureID* surfaceskinids) override;
diff --git a/src/common/models/model_md3.h b/src/common/models/model_md3.h
index e79a4c98b9..3d81cb1c39 100644
--- a/src/common/models/model_md3.h
+++ b/src/common/models/model_md3.h
@@ -66,7 +66,7 @@ public:
 	FMD3Model() = default;
 
 	virtual bool Load(const char * fn, int lumpnum, const char * buffer, int length) override;
-	virtual int FindFrame(const char * name) override;
+	virtual int FindFrame(const char * name, bool nodefault) override;
 	virtual void RenderFrame(FModelRenderer *renderer, FGameTexture * skin, int frame, int frame2, double inter, int translation, const FTextureID* surfaceskinids) override;
 	void LoadGeometry();
 	void BuildVertexBuffer(FModelRenderer *renderer);
diff --git a/src/common/models/model_obj.h b/src/common/models/model_obj.h
index a07090900d..55a47363cb 100644
--- a/src/common/models/model_obj.h
+++ b/src/common/models/model_obj.h
@@ -97,7 +97,7 @@ public:
 	FOBJModel(): hasMissingNormals(false), hasSmoothGroups(false), vertFaces(nullptr) {}
 	~FOBJModel();
 	bool Load(const char* fn, int lumpnum, const char* buffer, int length) override;
-	int FindFrame(const char* name) override;
+	int FindFrame(const char* name, bool nodefault) override;
 	void RenderFrame(FModelRenderer* renderer, FGameTexture* skin, int frame, int frame2, double inter, int translation, const FTextureID* surfaceskinids) override;
 	void BuildVertexBuffer(FModelRenderer* renderer) override;
 	void AddSkins(uint8_t* hitlist, const FTextureID* surfaceskinids) override;
diff --git a/src/common/models/model_ue1.h b/src/common/models/model_ue1.h
index 2d29c2eff9..f2ed1952c4 100644
--- a/src/common/models/model_ue1.h
+++ b/src/common/models/model_ue1.h
@@ -25,7 +25,7 @@ public:
 	};
 
 	bool Load(const char * fn, int lumpnum, const char * buffer, int length) override;
-	int FindFrame(const char * name) override;
+	int FindFrame(const char * name, bool nodefault) override;
 	void RenderFrame(FModelRenderer *renderer, FGameTexture * skin, int frame, int frame2, double inter, int translation, const FTextureID* surfaceskinids) override;
 	void BuildVertexBuffer(FModelRenderer *renderer) override;
 	void AddSkins(uint8_t *hitlist, const FTextureID* surfaceskinids) override;
diff --git a/src/common/models/models_md2.cpp b/src/common/models/models_md2.cpp
index f384723016..81d1c36668 100644
--- a/src/common/models/models_md2.cpp
+++ b/src/common/models/models_md2.cpp
@@ -348,13 +348,13 @@ void FDMDModel::AddSkins(uint8_t *hitlist, const FTextureID*)
 // FDMDModel::FindFrame
 //
 //===========================================================================
-int FDMDModel::FindFrame(const char * name)
+int FDMDModel::FindFrame(const char * name, bool nodefault)
 {
 	for (int i=0;i<info.numFrames;i++)
 	{
 		if (!stricmp(name, frames[i].name)) return i;
 	}
-	return -1;
+	return FErr_NotFound;
 }
 
 //===========================================================================
diff --git a/src/common/models/models_md3.cpp b/src/common/models/models_md3.cpp
index 29db7aa6fa..95ac491673 100644
--- a/src/common/models/models_md3.cpp
+++ b/src/common/models/models_md3.cpp
@@ -328,13 +328,13 @@ void FMD3Model::AddSkins(uint8_t *hitlist, const FTextureID* surfaceskinids)
 //
 //===========================================================================
 
-int FMD3Model::FindFrame(const char * name)
+int FMD3Model::FindFrame(const char * name, bool nodefault)
 {
 	for (unsigned i = 0; i < Frames.Size(); i++)
 	{
 		if (!stricmp(name, Frames[i].Name)) return i;
 	}
-	return -1;
+	return FErr_NotFound;
 }
 
 //===========================================================================
diff --git a/src/common/models/models_obj.cpp b/src/common/models/models_obj.cpp
index 5d4aefd3bf..d804ffff6a 100644
--- a/src/common/models/models_obj.cpp
+++ b/src/common/models/models_obj.cpp
@@ -613,9 +613,9 @@ FVector3 FOBJModel::CalculateNormalSmooth(unsigned int vidx, unsigned int smooth
  * @param name The name of the frame
  * @return The index of the frame
  */
-int FOBJModel::FindFrame(const char* name)
+int FOBJModel::FindFrame(const char* name, bool nodefault)
 {
-	return 0; // OBJs are not animated.
+	return nodefault? FErr_Singleframe : 0; // OBJs are not animated.
 }
 
 /**
diff --git a/src/common/models/models_ue1.cpp b/src/common/models/models_ue1.cpp
index 82847103d2..ad80789f3a 100644
--- a/src/common/models/models_ue1.cpp
+++ b/src/common/models/models_ue1.cpp
@@ -221,10 +221,12 @@ void FUE1Model::UnloadGeometry()
 	groups.Reset();
 }
 
-int FUE1Model::FindFrame( const char *name )
+int FUE1Model::FindFrame( const char *name, bool nodefault )
 {
-	// unsupported, there are no named frames
-	return -1;
+	// there are no named frames, but we need something here to properly interface with it. So just treat the string as an index number.
+	auto index = strtol(name, nullptr, 0);
+	if (index < 0 || index >= numFrames) return FErr_NotFound;
+	return index;
 }
 
 void FUE1Model::RenderFrame( FModelRenderer *renderer, FGameTexture *skin, int frame, int frame2, double inter, int translation, const FTextureID* surfaceskinids)
diff --git a/src/common/models/models_voxel.cpp b/src/common/models/models_voxel.cpp
index 6db0c9e5f9..41f5e854af 100644
--- a/src/common/models/models_voxel.cpp
+++ b/src/common/models/models_voxel.cpp
@@ -378,9 +378,9 @@ bool FVoxelModel::Load(const char * fn, int lumpnum, const char * buffer, int le
 //
 //===========================================================================
 
-int FVoxelModel::FindFrame(const char * name)
+int FVoxelModel::FindFrame(const char * name, bool nodefault)
 {
-	return 0;
+	return nodefault? FErr_Voxel : 0; // -2, not -1 because voxels are special.
 }
 
 //===========================================================================
diff --git a/src/common/objects/dobjgc.h b/src/common/objects/dobjgc.h
index a1695b8efa..7997145b7e 100644
--- a/src/common/objects/dobjgc.h
+++ b/src/common/objects/dobjgc.h
@@ -107,6 +107,16 @@ namespace GC
 		return obj = NULL;
 	}
 
+	// Handles a read barrier for a const pointer. This does not alter the source data, but only returns NULL if the object is destroyed.
+	template<class T> inline T* ReadBarrier(const T*& obj)
+	{
+		if (obj == NULL || !(obj->ObjectFlags & OF_EuthanizeMe))
+		{
+			return obj;
+		}
+		return NULL;
+	}
+
 	// Check if it's time to collect, and do a collection step if it is.
 	static inline void CheckGC()
 	{
@@ -214,7 +224,13 @@ public:
 		return GC::ReadBarrier(pp);
 	}
 
-	constexpr T ForceGet() noexcept	//for situations where the read barrier needs to be skipped.
+	constexpr T Get() const noexcept
+	{
+		auto ppp = pp;
+		return GC::ReadBarrier(ppp);
+	}
+
+	constexpr T ForceGet() const noexcept	//for situations where the read barrier needs to be skipped.
 	{
 		return pp;
 	}
diff --git a/src/common/scripting/core/types.cpp b/src/common/scripting/core/types.cpp
index fb844c62a6..5dd7cd6b3b 100644
--- a/src/common/scripting/core/types.cpp
+++ b/src/common/scripting/core/types.cpp
@@ -918,7 +918,7 @@ void PFloat::SetValue(void *addr, double val)
 
 int PFloat::GetValueInt(void *addr) const
 {
-	return xs_ToInt(GetValueFloat(addr));
+	return int(GetValueFloat(addr));
 }
 
 //==========================================================================
diff --git a/src/common/thirdparty/math/cmath.h b/src/common/thirdparty/math/cmath.h
index 26102e3f09..4da0afcb6d 100644
--- a/src/common/thirdparty/math/cmath.h
+++ b/src/common/thirdparty/math/cmath.h
@@ -54,14 +54,14 @@ extern FFastTrig fasttrig;
 #define RAD2BAM(f)		((unsigned)xs_CRoundToInt((f) * (0x80000000/3.14159265358979323846)))
 
 
-inline double fastcosbam(double v)
+inline double fastcosbam(unsigned int v)
 {
-	return fasttrig.cos(xs_CRoundToUInt(v));
+	return fasttrig.cos(v);
 }
 
-inline double fastsinbam(double v)
+inline double fastsinbam(unsigned int v)
 {
-	return fasttrig.sin(xs_CRoundToUInt(v));
+	return fasttrig.sin(v);
 }
 
 inline double fastcosdeg(double v)
diff --git a/src/common/utility/cmdlib.h b/src/common/utility/cmdlib.h
index b998cf99d6..f0eef9b403 100644
--- a/src/common/utility/cmdlib.h
+++ b/src/common/utility/cmdlib.h
@@ -100,7 +100,7 @@ inline void fillshort(void* buff, size_t count, uint16_t clear)
 	}
 }
 
-template<typename T> inline constexpr T Sgn(const T& val) { return (val > 0) - (val < 0); }
+template<typename T> inline constexpr int Sgn(const T& val) { return (val > 0) - (val < 0); }
 
 
 inline int sizeToBits(int w)
diff --git a/src/common/utility/intrect.h b/src/common/utility/intrect.h
index 97e9bd90a0..1de15df29c 100644
--- a/src/common/utility/intrect.h
+++ b/src/common/utility/intrect.h
@@ -46,6 +46,16 @@ struct IntRect
 		return top + height;
 	}
 
+	int Width() const
+	{
+		return width;
+	}
+
+	int Height() const
+	{
+		return height;
+	}
+
 
 };
 
diff --git a/src/common/utility/vectors.h b/src/common/utility/vectors.h
index cb927b4c2d..126f3f51c4 100644
--- a/src/common/utility/vectors.h
+++ b/src/common/utility/vectors.h
@@ -141,11 +141,13 @@ struct TVector2
 	}
 
 	// Scalar addition
+#if 0
 	TVector2 &operator+= (double scalar)
 	{
 		X += scalar, Y += scalar;
 		return *this;
 	}
+#endif
 
 	friend TVector2 operator+ (const TVector2 &v, vec_t scalar)
 	{
@@ -341,6 +343,11 @@ struct TVector3
 		return X == 0 && Y == 0 && Z == 0;
 	}
 
+	TVector3 plusZ(double z)
+	{
+		return { X, Y, Z + z };
+	}
+
 	TVector3 &operator= (const TVector3 &other) = default;
 
 	// Access X and Y and Z as an array
@@ -385,11 +392,13 @@ struct TVector3
 	}
 
 	// Scalar addition
+#if 0
 	TVector3 &operator+= (vec_t scalar)
 	{
 		X += scalar, Y += scalar, Z += scalar;
 		return *this;
 	}
+#endif
 
 	friend TVector3 operator+ (const TVector3 &v, vec_t scalar)
 	{