from ursina import *
import 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)*.05for 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()
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