Generation of scenes mixing via API in high traffic

[marcelo-earth]

In some cases, the scenes returned by the API can be mixed when there are multiple requests.

Example:

Code:

class GraphArrow(Scene):
    def construct(self):
        # Create axes and labels
        axes = Axes(x_range=[0, 10], y_range=[0, 10])
        x_label = MathTex(r'\text{Espaço}').scale(0.575)
        y_label = MathTex(r'\text{Tempo}').scale(0.75)
        labels = VGroup(x_label.next_to(axes.x_axis, RIGHT), y_label.next_to(axes.y_axis, UP))

        # Create dots
        d = Dot(color=WHITE, radius=0.1)
        d.move_to([0, 0, 0])
        d2 = Dot(color=WHITE, radius=0.1)
        d2.move_to([-1, 0, 0])

        # Group dots
        g = VGroup(d, d2)
        g.arrange()

        # Create traced paths
        trace = VMobject()
        trace2 = VMobject()

        trace_points = []
        trace2_points = []

        def update_trace(trace):
            trace_points.append(d.get_center())
            if len(trace_points) > 1:
                new_path = DashedVMobject(Line(trace_points[-2], trace_points[-1]), num_dashes=1, equal_lengths=True)
                trace.add(new_path)

        def update_trace2(trace2):
            trace2_points.append(d2.get_center())
            if len(trace2_points) > 1:
                new_path = DashedVMobject(Line(trace2_points[-2], trace2_points[-1]), num_dashes=1, equal_lengths=True)
                trace2.add(new_path)

        trace.add_updater(update_trace)
        trace2.add_updater(update_trace2)

        # Add elements to the scene
        self.play(Write(axes), Write(labels))
        self.add(d, d2, trace, trace2)
        self.wait(2)
        self.play(d.animate.move_to([0, 3, 0]), d2.animate.move_to([0, 2, 0]))
        self.wait(2)
        self.play(d.animate.move_to([0, -3, 0]), d2.animate.move_to([0, -2, 0]))
        self.wait(2)
        trace.clear_updaters()
        trace2.clear_updaters()

Video:

video-GenScene-GenScene-338.1.mp4

[LucaM185]

I might know what's happening here, i tried building exactly that last year...
i had the problem that the first scene rendered had a name and the next ones kept the name of the first (for some dumb reason this is the default behaviour of manim) i fixed it by setting

force_output_as_scene_name = True

in manim. i literally ctrl-clicked my way from Scene->CairoRenderer->SceneFileWriter, ctrl-f "force" and you should find it.
it requires some changes to the structure of the code.

i didn't look at your code too closely, but having built this before, it seems like that kind of issue, since you are likely running in docker you will have to find a smarter way to do this...

[marcelo-earth]

I might know what's happening here, i tried building exactly that last year... i had the problem that the first scene rendered had a name and the next ones kept the name of the first (for some dumb reason this is the default behaviour of manim) i fixed it by setting

force_output_as_scene_name = True

in manim. i literally ctrl-clicked my way from Scene->CairoRenderer->SceneFileWriter, ctrl-f "force" and you should find it. it requires some changes to the structure of the code.

i didn't look at your code too closely, but having built this before, it seems like that kind of issue, since you are likely running in docker you will have to find a smarter way to do this...

Hi @LucaM185!, thank you so much!, I've thought about rewriting the scene name to make it different before.
I didn't think Manim would have this option, but I guess it has to do with speeding up the rendering process and not re-rendering already made scenes (I think).

[LucaM185]

Yes, if you reuse the same scene name it intelligently reuses previous partial_movie_files if they have the same hash. This is obviously not useful if you have completely different scenes, so I don't see a performance penalty in using different names... Just make sure you delete the folders after a while because of storage costs

[marcelo-earth]

Yes, if you reuse the same scene name it intelligently reuses previous partial_movie_files if they have the same hash. This is obviously not useful if you have completely different scenes, so I don't see a performance penalty in using different names... Just make sure you delete the folders after a while because of storage costs

Great, thanks a lot @LucaM185, we will start implementing the force_output_as_scene_name = True instruction in the following days.