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from manimlib.imports import *
class cone(ThreeDScene):
def construct(self):
axes = ThreeDAxes()
eqn = TextMobject(r'$z^{2} = x^{2} + y^{2}$')
conecurve = ParametricFunction(
lambda t: np.array([
t*np.cos(TAU*t),
t*np.sin(TAU*t),
t
]), t_min = -2.6, t_max = 2.6
).scale(0.85)
conesurface = ParametricSurface(
lambda u,v: np.array([
3*np.sin(u)*np.cos(TAU*v),
3*np.sin(u)*np.sin(TAU*v),
2.7*u
]), u_min = -1
).scale(0.85)
self.play(FadeIn(eqn))
self.wait(2)
self.play(FadeOut(eqn))
self.set_camera_orientation(phi = 75*DEGREES, theta=50*DEGREES)
self.play(FadeIn(axes), ShowCreation(conecurve, run_time = 3))
self.play(FadeOut(conecurve), FadeIn(conesurface))
self.begin_ambient_camera_rotation(rate=0.03)
self.wait(2)
self.play(FadeOut(axes), FadeOut(conesurface))
self.wait(2)
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