1 files changed, 47 insertions, 0 deletions
diff --git a/FSF-2020/calculus-of-several-variables/triple-and-surface-integrals/flux/file3_normal_vector.py b/FSF-2020/calculus-of-several-variables/triple-and-surface-integrals/flux/file3_normal_vector.py
new file mode 100644
index 0000000..a959210
--- /dev/null
+++ b/FSF-2020/calculus-of-several-variables/triple-and-surface-integrals/flux/file3_normal_vector.py
@@ -0,0 +1,47 @@
+from manimlib.imports import *
+class S(ThreeDScene):
+    def construct(self):
+        axes=ThreeDAxes()
+
+        sphere=Sphere(radius=2,checkerboard_colors=[BLUE_C,BLUE_B],fill_opacity=0.75)
+        
+
+        v1=Vector(color=YELLOW,buff=5)
+        v1.rotate(PI/4,axis=DOWN)
+        v1.shift(1.5*RIGHT+1.5*OUT)
+
+        v2=Vector(color=RED,buff=5)
+        v2.rotate(PI/4,axis=DOWN)
+        v2.rotate(PI,axis=DOWN)
+        v2.shift(0.77*RIGHT+0.77*OUT)
+
+        
+
+        
+        n1=TextMobject(r"$\vec{n}$",color=YELLOW)
+        n2=TextMobject(r"$-\vec{n}$",color= RED)
+        n1.rotate(PI/2,axis=RIGHT)
+        n1.shift(2*RIGHT+2*OUT)
+        n2.rotate(PI/2,axis=RIGHT)
+        n2.shift(0.42*RIGHT+0.42*OUT)
+
+
+
+        self.set_camera_orientation(phi=75 * DEGREES,theta=-45*DEGREES)
+        # self.add(mobius)
+        # self.play(ShowCreation(axes))
+        self.play(ShowCreation(axes))
+        # self.play(ShowCreation(vg))
+        self.play(ShowCreation(sphere))
+        self.wait(0.7)
+        self.play(ShowCreation(v1, run_time=2))
+        self.play(ShowCreation(n1))
+        self.wait(1)
+        self.begin_ambient_camera_rotation(rate=0.65)
+        self.wait(2)
+        self.play(ShowCreation(v2, run_time=3))
+        self.wait(3)
+        self.play(ShowCreation(n2))
+
+        self.stop_ambient_camera_rotation() 
+        self.wait(1.2)