Add example_scenes/opengl.py

Author: eulertour

example_scenes/assets/1280px-The_earth_at_night.jpg

@@ -0,0 +1,86 @@
+from manim import *
+from manim.opengl import *
+import os
+from pathlib import Path
+
+
+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 = OpenGLTorus(r1=1, r2=1)
+        torus2 = OpenGLTorus(r1=3, r2=1)
+        sphere = OpenGLSphere(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 image directory in
+        # the custom_config.yml file
+
+        script_location = Path(os.path.realpath(__file__)).parent
+        day_texture = (
+            script_location / "assets" / "1280px-Whole_world_-_land_and_oceans.jpg"
+        )
+        night_texture = script_location / "assets" / "1280px-The_earth_at_night.jpg"
+
+        surfaces = [
+            OpenGLTexturedSurface(surface, day_texture, night_texture)
+            for surface in [sphere, torus1, torus2]
+        ]
+
+        for mob in surfaces:
+            mob.shift(IN)
+            mob.mesh = OpenGLSurfaceMesh(mob)
+            mob.mesh.set_stroke(BLUE, 1, opacity=0.5)
+
+        # Set perspective
+        frame = self.renderer.camera
+        frame.set_euler_angles(
+            theta=-30 * DEGREES,
+            phi=70 * DEGREES,
+        )
+
+        surface = surfaces[0]
+
+        self.play(
+            FadeIn(surface),
+            ShowCreation(surface.mesh, lag_ratio=0.01, run_time=3),
+        )
+        for mob in surfaces:
+            mob.add(mob.mesh)
+        surface.save_state()
+        self.play(Rotate(surface, PI / 2), run_time=2)
+        for mob in surfaces[1:]:
+            mob.rotate(PI / 2)
+
+        self.play(Transform(surface, surfaces[1]), run_time=3)
+
+        self.play(
+            Transform(surface, surfaces[2]),
+            # Move camera frame during the transition
+            frame.animate.increment_phi(-10 * DEGREES),
+            frame.animate.increment_theta(-20 * DEGREES),
+            run_time=3,
+        )
+        # Add ambient rotation
+        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.animate.move_to(3 * IN), run_time=5)
+        self.play(light.animate.shift(10 * OUT), run_time=5)
+
+        # drag_text = Text("Try moving the mouse while pressing d or s")
+        # drag_text.move_to(light_text)
+        # drag_text.fix_in_frame()

example_scenes/assets/1280px-Whole_world_-_land_and_oceans.jpg

@@ -1147,7 +1147,7 @@ def align_to(self, mobject_or_point, direction=ORIGIN):
         return self
 
     def get_group_class(self):
-        return Group
+        return OpenGLGroup
 
     # Alignment