1 files changed, 15 insertions, 3 deletions
diff --git a/FSF-2020/calculus-of-several-variables/multivariable-functions-and-paritial-derivatives/scalar-functions/file3_parabola_example.py b/FSF-2020/calculus-of-several-variables/multivariable-functions-and-paritial-derivatives/scalar-functions/file3_parabola_example.py
index 74dc063..63c16b3 100644
--- a/FSF-2020/calculus-of-several-variables/multivariable-functions-and-paritial-derivatives/scalar-functions/file3_parabola_example.py
+++ b/FSF-2020/calculus-of-several-variables/multivariable-functions-and-paritial-derivatives/scalar-functions/file3_parabola_example.py
@@ -9,11 +9,10 @@ class Parabola(ThreeDScene):
                 2*np.cosh(u)*np.cos(v),
                 2*np.cosh(u)*np.sin(v),
                 2*np.sinh(u)
-            ]),v_min=0,v_max=TAU,u_min=0,u_max=2,checkerboard_colors=[YELLOW_D, YELLOW_E],
+            ]),v_min=0,v_max=TAU,u_min=0,u_max=2,checkerboard_colors=[YELLOW_D, YELLOW_E],#
             resolution=(15, 32))
 
-        text3d = TextMobject(r"Plot of $f: \mathbb{R}^2 \rightarrow \mathbb{R}$", "z = f(x,y)")
-        self.add_fixed_in_frame_mobjects(text3d) 
+        text3d = TextMobject(r"Plot of $f: \mathbb{R}^2 \rightarrow \mathbb{R}$", r"$z = f(x,y) = \sqrt{x^2 + y^2 - 4}$") 
         text3d[0].move_to(4*LEFT+2*DOWN)
         text3d[1].next_to(text3d[0], DOWN)
         text3d[0].set_color_by_gradient(RED, ORANGE, YELLOW, GREEN, BLUE, PURPLE)
@@ -21,8 +20,21 @@ class Parabola(ThreeDScene):
 
         #self.set_camera_orientation(phi=0 * DEGREES,theta=270*DEGREES)
         self.move_camera(phi=110* DEGREES,theta=45*DEGREES)
+
         self.add(axes)
+
+        axis = TextMobject(r"X",r"Y",r"Z")
+        axis[0].move_to(6*RIGHT)
+        axis[1].move_to(6*UP)
+        axis[2].move_to(np.array([0,0,3.7]))
+
+        self.add_fixed_orientation_mobjects(axis[2])
+        self.add_fixed_orientation_mobjects(axis[0])
+        self.add_fixed_orientation_mobjects(axis[1]) 
+
+
         self.play(ShowCreation(paraboloid))
+        self.add_fixed_in_frame_mobjects(text3d)
         self.play(Write(text3d[0]))
         self.play(Write(text3d[1]))
         self.begin_ambient_camera_rotation(rate=0.2)