Position raycast as test

[pjkw]

Surface Test > Normals/Distance?

Get particles close to the surface, and then near normals pointing in the direction you want (up).

Don't think that solves anything.. I think you misinterpret what Im trying to achieve.

Attaching my desired result, this example is done with just edit poly select with "occluded" checked (and selecting from the top view), so not a viable option. As I said I sortof did it wiith position raycast but it was not ideal in any way.