copyimport numpy as np number_of_particles = 1000 # keep this as low as possible points = np.array([Vec3(0,0,0) for i in range(number_of_particles)]) directions = np.array([Vec3(random.random()-.5,random.random()-.5,random.random()-.5)*.05 for i in range(number_of_particles)]) frames = [] # simulate the particles once and cache the positions in a list. for i in range(60*1): points += directions frames.append(copy(points)) class ParticleSystem(Entity): def __init__(self, **kwargs): super().__init__(model=Mesh(vertices=points, mode='point', static=False, render_points_in_3d=True, thickness=.1), t=0, duration=1, **kwargs) for key, value in kwargs.items(): setattr(self, key, value) def update(self): self.t += time.dt if self.t >= self.duration: destroy(self) return self.model.vertices = frames[floor(self.t * 60)] self.model.generate() if __name__ == '__main__': app = Ursina(vsync=False) window.color = color.black def input(key): if key == 'space': p = ParticleSystem(position=Vec3(random.random(),random.random(),random.random())*2, color=color.random_color(), rotation_y=random.random()*360) p.fade_out(duration=.2, delay=1-.2, curve=curve.linear) Text('press space to spawn particles', origin=(0,0), y=-.45) EditorCamera() app.run()