Hello Guus and every other scatterfuns!
I'm working on a rainy scene which is a semi personal project as always, and I tried to use PS's ray scatter feature to achieve the desired effects. I have several suggestions to improve the ray scattering method, and I would like to ask your help and criticts and comments too. First the suggestions:
- in my scene the obj contains the terrain arround the building and it is much larger than the building itself (because of the surrounding trees) which results a lot of useless rain drop scatters arround the building. I suggest you to allow the user to use negative XY-margin to allow him/her to restrict (decrease) the ray scatter effect.
- basically PS creates two csvs, one for rain drops, and one for rain impact points, which is great of course, but the actual workflow prevents me to use different impact meshes becuase this way I can only play with the size of the impact meshes and not with their form. It also seems to me that the pattern of the impact points doesn't change when I reload the scene or I change something in the settings, so the points of the impact is always the same for me (Of course if I increase the number of rays, new impact points are revealing, but the location of the first 500 remains the same). I would like to ask you to create an option for the user - just like in case of the simple scattering method - where something changes the randomness of the impact points of the rays.
- it would be great if I may exclude materials from ray scattering. For instance I don't want to create rain impact points on the ground where I will scatter grass, just on my rooftop, which will be seen on the rendered picture.
Here is the above mentioned scene in its current state. I'm still missing many things and I don't like a couple of things on it, but now I'm stuck with one thing

As you can see the topic of the picture is the roof. During a real rain, the rain drops hit the surface of the roof and the walls and a part of the covered terrace because the rain doesn't fall vertically. I want to create rain impacts on the first 0,5-1,0 m of the left side of the wooden floor, as I expect the rain to fall there too, and I also want to create splashes on the wooden facade to the right for the same reason.
What kind of material should I use in Octane to achive the humifying effect of the rain drops on the wood? After the drop hits the wood, first the wood became darker, and after a few other splashes it starts to slightly mirror or reflect the surrounding things. (I also can't achieve such "draw distance" effect of the impacts as we can see in the teaser picture of PS release 1.5, but I can wait with that part until I receive the new release.)
Thanks for your suggestions and CC in advance!