implemented some more controls

src/gui/input/Widget.h

@@ -12,12 +12,17 @@ public:
   Point3 cameraDir;
   Vec3 cameraPos;
   Point3 lightPos;
-  Color3 bgColor;
+  Color3 bgColor; // TODO: widget
 
   bool paused;
   bool renderOnce;
   char* fps;
 
+  int opacityK;
+  float opacityKReal;
+  float sigmoidOne;
+  float sigmoidTwo;
+
   ImGuiIO io;
 
   void tick(double fps);