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Add notes to SurfaceExample

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Grant Sanderson 2021-01-15 11:11:07 -10:00
parent c698c6ea44
commit 2daf62ecea
1 changed files with 24 additions and 2 deletions
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26
example_scenes.py
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@ -310,22 +310,33 @@ class SurfaceExample(Scene):
}
def construct(self):
surface_text = Text("For 3d scenes, try using surfaces")
surface_text.fix_in_frame()
surface_text.to_edge(UP)
self.add(surface_text)
self.wait(0.1)
torus1 = Torus(r1=1, r2=1)
torus2 = Torus(r1=3, r2=1)
sphere = Sphere(radius=3, resolution=torus1.resolution)
# You can texture a surface with up to two images, which will
# be interpreted as the side towards the light, and away from
# the light. These can be either urls, or paths to a local file
# in whatever you've set as the iamge directory in
# in whatever you've set as the image directory in
# the custom_defaults.yml file
# day_texture = "EarthTextureMap"
# night_texture = "NightEarthTextureMap"
day_texture = "https://upload.wikimedia.org/wikipedia/commons/thumb/4/4d/Whole_world_-_land_and_oceans.jpg/1280px-Whole_world_-_land_and_oceans.jpg"
night_texture = "https://upload.wikimedia.org/wikipedia/commons/thumb/b/ba/The_earth_at_night.jpg/1280px-The_earth_at_night.jpg"
surfaces = [
TexturedSurface(surface, day_texture, night_texture)
for surface in [sphere, torus1, torus2]
]
for mob in surfaces:
mob.shift(IN)
mob.mesh = SurfaceMesh(mob)
mob.mesh.set_stroke(BLUE, 1, opacity=0.5)
@ -365,12 +376,23 @@ class SurfaceExample(Scene):
frame.add_updater(lambda m, dt: m.increment_theta(-0.1 * dt))
# Play around with where the light is
light_text = Text("You can move around the light source")
light_text.move_to(surface_text)
light_text.fix_in_frame()
self.play(FadeTransform(surface_text, light_text))
light = self.camera.light_source
self.add(light)
light.save_state()
self.play(light.move_to, 3 * IN, run_time=5)
self.play(light.shift, 10 * OUT, run_time=5)
self.wait(4)
drag_text = Text("Try clicking and dragging while pressing d")
drag_text.move_to(light_text)
drag_text.fix_in_frame()
self.play(FadeTransform(light_text, drag_text))
self.wait()
# See https://github.com/3b1b/videos for many, many more