[316797-capture.jpg] Hello, I have a scene of a first person POV car driving with a rain particle system. The problem is that rain falls through the car’s roof. [316774-capture2.jpg] In the editor, I placed the camera from the side to see how the rain goes through the car’s roof. However, watch…

Okay, I remember when I first tried Niagara in 4.24 I had the same issue, but it doesn’t seem to happen in 4.25. If you for some reasons can’t use 4.25, you can at least download it and see if the issue is still there.

Ok! I’ll try it out as soon as I can. Hope it works, thank you.

And another thing: are you using CPU of GPU for particles? If GPU, it only handles things that are in the field of view. Setting fixed bounds of a large size doesn’t seem to do anything; in Cascade, it was a way to force particles to be calculated even outside the field of view, but in Niagara it do…

How do I set the particles to use CPU or GPU?

There’s a parameter called “Sim Target” in the emitter settings.

[316930-capture.jpg] hmm can’t seem to find it.

Oh, you’re using Cascade. I had presumed is was Niagara. Try increasing the bounds. Click the black area to the right of your emitter, and in details check Use Fixed Relative Bounds, and set Min and Max to larger numbers (min to negative, max to positive), like 65536 or something. But you’re using…

Hi, AFAIK GPU particles by default only use SceneDepth for collision, therefore if you can’t see the point where the collision would happen, then there won’t be any collision. If you’re using MeshDistance Fields, then you can use that instead of SceneDepth Using Particle Collision Mode for Distance…

Even if using Distance Field I have some rain particles falling through without collision. I placed a huge thick cube on top of the car and it had less rain falling through but still a few rain particles fell through.

Particle System Collision Inconsistent

Development Asset Creation FX

eduniga (eduniga) October 2, 2020, 12:08pm 7

hmm can’t seem to find it.