howto change offset of collidePositition on Y axis ?

[Bonedaddy]

Make a second plane which they really collide with, hide it, and move it up in Y a couple units.

[butCherHeLL]

I did already same as you say.

but I thought if another way to solve this with adding some per particle attributes spesific to this.

[apoc519]

expression probably wouldnt work because the particles havnt really collided with anything at the point where you want them to stop. A mel script would do the job but would be slow. You could cache the particles then just move the particleShape up a bit or Another solution might be to use instances and just offset their pivot

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