Add "Hide on Contact" collision mode to ParticlesMaterial #61238
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This can be used to make particles disappear when colliding, rather than bouncing around or sticking to surfaces. This is useful for rain particles which should not be able to go through floors/ceilings, but shouldn't stick to surfaces either.
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Rebased and tested again, it works as expected. |
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Looks good to me, would be useful to hear from @QbieShay as well |
QbieShay
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Thanks! |
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This can be used to make particles disappear when colliding, rather than bouncing around or sticking to surfaces.
This is useful for rain particles which should not be able to go through floors/ceilings, but shouldn't stick to surfaces either.
Performance-wise, this will perform better than using Rigid since inactive particles are no longer rendered – their vertices are culled by the GPU, and the mesh materials won't use up any fillrate.
This implementation works with subemitters. You can use a "parent" particle that has collision mode set to Hide On Contact, and a subemitter with Rigid collision mode. If you use similar-looking particles, this can be used to simulate scaling or color changes on contact. This can also be used to create decal billboards on contact (using small plane meshes, not actual Decal nodes).
simplescreenrecorder-2022-05-21_00.10.39.mp4
This implementation currently doesn't handle trails correctly (they will create a "streak" back to the particle system origin), but I believe this is an engine bug.
Testing project: https://0x0.st/oajR.zip (link expires in April 2023)