Changing the Y position of particles 2D while the screen is scrolling upward

fabianom

Hi people! Hope you're doing well.

I'm facing some trouble in my game trying to change the y position of the GPUParticles2D node when I'm scrolling the screen upward, because the particles are simulating snow falling and when I change the position of the GPUParticles2D, the result is bizarre. Do you have any idea to make it work satisfactorily?

Here's a demo of what's happening:

My current code is:

func _process(delta):
	if player and player.global_position.y - (y_offset/2) < snow_particles.global_position.y:
		snow_particles.global_position.y -= y_offset
		snow_particles.preprocess = 30

Where y_offset is get_viewport_rect().size.y and snow_particles is the GPUParticles2D node.

Important to say that the GPUParticles2D seems just start to emmiting the particles when it's inside the viewport, so a gap with no snow falling happens.

Any hint is appreciated.

xyz

fabianom Parent particles to the camera.

fabianom

xyz Nice. It works partially! But the screen isn't filled with particles when the camera moves. It takes some time to the snow falls, as you can see on the image (right side of the screen after the player moved):

Do you have any idea about how I can fix it?

Ps. I alredy set the GPUParticles2D preprocessing value to 30s, but the snow fall stills not working properly

xyz

fabianom You can keep particles in particle system's local space. Enable Drawing/Local Space in the Inspector. The particles now won't appear to scroll but in might be good enough for the effect. Otherwise you'll have to extend the emiter box sideways to cover yet-to-be-scrolled-in areas.

fabianom

xyz Nice try, but the result wasn't good, dude, because the particles are moving together with the player. But thanks anyway.

I start to thinking in move the GPUParticles2D x position when the camera reaches the end of the GPUParticles2D x position. Using the same approach I applied to the ground to create an infinite scroller. I'll send you some news. Thanks for the help.

xyz

fabianom Just widen the emitter box extents, bro.

fabianom

xyz I just increased the size of the emitter box, making it always being visible on the camera then it works. Thank you.