[Glow effect] Adding a blurry copy of an object. #manim #glow #shadow #PIL #bitmap

20251210_glow.py

from PIL import Image, ImageFilter

class Scene2(MovingCameraScene):
    def construct(self):
        def blur_image(mobjs, blur=15, bright=1.2, scale_first=1.2):
            scene = Scene()
            render = scene.renderer
            objs = VGroup(*[m.copy().scale(scale_first, about_point=m.get_center()) for m in mobjs])
            render.camera.set_pixel_array(np.zeros_like(render.camera.pixel_array))
            render.camera.capture_mobjects(objs)
            img = render.camera.get_image()
            img = img.filter(ImageFilter.GaussianBlur(blur))
            img = img.point(lambda p: p * bright)
            return ImageMobject(img).scale_to_fit_width(config["frame_width"]).move_to(ORIGIN)

        planex = NumberPlane(
            x_range=(-16, 16, 0.3),
            y_range=(-9, 9, 0.3),
            background_line_style={"stroke_color": GREY_C, "stroke_width":1, "stroke_opacity":0.3},
            faded_line_style = dict(),
            faded_line_ratio = 1
        )

        drone = SVGMobject("bilder/drone.svg")

        glow = blur_image(drone, blur=20, bright=1.8, scale_first=1.15)
        dg = Group(drone,glow)
        dg.move_to(planex.c2p(2,3.5)) #This code brings warnings
        self.add(dg)
        self.play(FadeIn(planex))
        self.wait()

readme.md

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