diff --git a/src/gl/scene/gl_scene.cpp b/src/gl/scene/gl_scene.cpp
index 9b2792d65..9bfca82ff 100644
--- a/src/gl/scene/gl_scene.cpp
+++ b/src/gl/scene/gl_scene.cpp
@@ -987,7 +987,7 @@ struct FGLInterface : public FRenderer
 	void WriteSavePic (player_t *player, FileWriter *file, int width, int height) override;
 	void StartSerialize(FSerializer &arc) override;
 	void EndSerialize(FSerializer &arc) override;
-	void RenderTextureView (FCanvasTexture *self, AActor *viewpoint, int fov) override;
+	void RenderTextureView (FCanvasTexture *self, AActor *viewpoint, double fov) override;
 	void PreprocessLevel() override;
 	void CleanLevelData() override;
 	bool RequireGLNodes() override;
@@ -1098,7 +1098,7 @@ void FGLInterface::Init()
 CVAR(Bool, gl_usefb, false , CVAR_ARCHIVE|CVAR_GLOBALCONFIG)
 extern TexFilter_s TexFilter[];
 
-void FGLInterface::RenderTextureView (FCanvasTexture *tex, AActor *Viewpoint, int FOV)
+void FGLInterface::RenderTextureView (FCanvasTexture *tex, AActor *Viewpoint, double FOV)
 {
 	FMaterial * gltex = FMaterial::ValidateTexture(tex, false);
 
diff --git a/src/p_acs.cpp b/src/p_acs.cpp
index 2dfbec49b..ce21871a6 100644
--- a/src/p_acs.cpp
+++ b/src/p_acs.cpp
@@ -10041,7 +10041,7 @@ scriptwait:
 					}
 					else
 					{
-						FCanvasTextureInfo::Add (camera, picnum, STACK(1));
+						FCanvasTextureInfo::Add (camera, picnum, ACSToDouble(STACK(1)));
 					}
 				}
 				sp -= 3;
diff --git a/src/r_renderer.h b/src/r_renderer.h
index 5d6ee856c..54952bc29 100644
--- a/src/r_renderer.h
+++ b/src/r_renderer.h
@@ -49,7 +49,7 @@ struct FRenderer
 	virtual void OnModeSet () {}
 	virtual void SetClearColor(int color) = 0;
 	virtual void Init() = 0;
-	virtual void RenderTextureView (FCanvasTexture *tex, AActor *viewpoint, int fov) = 0;
+	virtual void RenderTextureView (FCanvasTexture *tex, AActor *viewpoint, double fov) = 0;
 	virtual void PreprocessLevel() {}
 	virtual void CleanLevelData() {}
 	virtual bool RequireGLNodes() { return false; }
diff --git a/src/r_utility.cpp b/src/r_utility.cpp
index ead7d569b..22fba0f68 100644
--- a/src/r_utility.cpp
+++ b/src/r_utility.cpp
@@ -1014,7 +1014,7 @@ void R_SetupFrame (FRenderViewpoint &viewpoint, FViewWindow &viewwindow, AActor
 //
 //==========================================================================
 
-void FCanvasTextureInfo::Add (AActor *viewpoint, FTextureID picnum, int fov)
+void FCanvasTextureInfo::Add (AActor *viewpoint, FTextureID picnum, double fov)
 {
 	FCanvasTextureInfo *probe;
 	FCanvasTexture *texture;
@@ -1062,7 +1062,7 @@ DEFINE_ACTION_FUNCTION(_TexMan, SetCameraToTexture)
 	PARAM_PROLOGUE;
 	PARAM_OBJECT(viewpoint, AActor);
 	PARAM_STRING(texturename); // [ZZ] there is no point in having this as FTextureID because it's easier to refer to a cameratexture by name and it isn't executed too often to cache it.
-	PARAM_INT(fov);
+	PARAM_FLOAT(fov);
 	FTextureID textureid = TexMan.CheckForTexture(texturename, FTexture::TEX_Wall, FTextureManager::TEXMAN_Overridable);
 	FCanvasTextureInfo::Add(viewpoint, textureid, fov);
 	return 0;
@@ -1150,7 +1150,7 @@ void FCanvasTextureInfo::Serialize(FSerializer &arc)
 		if (arc.BeginArray("canvastextures"))
 		{
 			AActor *viewpoint = nullptr;
-			int fov;
+			double fov;
 			FTextureID picnum;
 			while (arc.BeginObject(nullptr))
 			{
diff --git a/src/r_utility.h b/src/r_utility.h
index 07fae0cbb..eb108e411 100644
--- a/src/r_utility.h
+++ b/src/r_utility.h
@@ -136,9 +136,9 @@ struct FCanvasTextureInfo
 	TObjPtr<AActor*> Viewpoint;
 	FCanvasTexture *Texture;
 	FTextureID PicNum;
-	int FOV;
+	double FOV;
 
-	static void Add (AActor *viewpoint, FTextureID picnum, int fov);
+	static void Add (AActor *viewpoint, FTextureID picnum, double fov);
 	static void UpdateAll ();
 	static void EmptyList ();
 	static void Serialize(FSerializer &arc);
diff --git a/src/swrenderer/r_swrenderer.cpp b/src/swrenderer/r_swrenderer.cpp
index 9e8c4c6eb..19bf055a6 100644
--- a/src/swrenderer/r_swrenderer.cpp
+++ b/src/swrenderer/r_swrenderer.cpp
@@ -272,7 +272,7 @@ void FSoftwareRenderer::SetClearColor(int color)
 	mScene.SetClearColor(color);
 }
 
-void FSoftwareRenderer::RenderTextureView (FCanvasTexture *tex, AActor *viewpoint, int fov)
+void FSoftwareRenderer::RenderTextureView (FCanvasTexture *tex, AActor *viewpoint, double fov)
 {
 	auto renderTarget = r_polyrenderer ? PolyRenderer::Instance()->RenderTarget : mScene.MainThread()->Viewport->RenderTarget;
 	auto &cameraViewpoint = r_polyrenderer ? PolyRenderer::Instance()->Viewpoint : mScene.MainThread()->Viewport->viewpoint;
@@ -290,7 +290,7 @@ void FSoftwareRenderer::RenderTextureView (FCanvasTexture *tex, AActor *viewpoin
 	CameraLight savedCameraLight = *CameraLight::Instance();
 
 	DAngle savedfov = cameraViewpoint.FieldOfView;
-	R_SetFOV (cameraViewpoint, (double)fov);
+	R_SetFOV (cameraViewpoint, fov);
 
 	if (r_polyrenderer)
 		PolyRenderer::Instance()->RenderViewToCanvas(viewpoint, Canvas, 0, 0, tex->GetWidth(), tex->GetHeight(), tex->bFirstUpdate);
diff --git a/src/swrenderer/r_swrenderer.h b/src/swrenderer/r_swrenderer.h
index 06946321f..19f75758f 100644
--- a/src/swrenderer/r_swrenderer.h
+++ b/src/swrenderer/r_swrenderer.h
@@ -30,7 +30,7 @@ struct FSoftwareRenderer : public FRenderer
 	void OnModeSet() override;
 	void SetClearColor(int color) override;
 	void Init() override;
-	void RenderTextureView (FCanvasTexture *tex, AActor *viewpoint, int fov) override;
+	void RenderTextureView (FCanvasTexture *tex, AActor *viewpoint, double fov) override;
 
 	void PreprocessLevel() override;
 	void CleanLevelData() override;
diff --git a/wadsrc/static/zscript/base.txt b/wadsrc/static/zscript/base.txt
index f74c83e92..630e74abb 100644
--- a/wadsrc/static/zscript/base.txt
+++ b/wadsrc/static/zscript/base.txt
@@ -95,7 +95,7 @@ struct TexMan
 	native static Vector2 GetScaledOffset(TextureID tex);
 	native static int CheckRealHeight(TextureID tex);
 
-	native static void SetCameraToTexture(Actor viewpoint, String texture, int fov);
+	native static void SetCameraToTexture(Actor viewpoint, String texture, double fov);
 }
 
 enum DrawTextureTags