[Yonner Draas]

Thank you for the response.
I tried applying the expression to the Orientation but simply got an error: “Function effect is undefined.”
Since it’s such a complex expression I’m having a hard time finding my mistake. I also don’t really know how I would customize it.
What did I do wrong?

freq = effect("Slider Control")("Slider");
amp = 10;
n = freq.numKeys;
if (n > 0 && freq.key(1).time < time){
accum = freq.key(1).value*(freq.key(1).time - inPoint);
for (i = 2; i <= n; i++){
if (freq.key(i).time > time) break;
k1 = freq.key(i-1);
k2 = freq.key(i);
accum += (k1.value + k2.value)*(k2.time - k1.time)/2;
}
accum += (freq.value + freq.key(i-1).value)*(time - freq.key(i-1).time)/2;
}else{
accum = freq.value*(time - inPoint);
}
wiggle(1,amp,1,.5,accum)

[Yonner Draas]

Oh! Happy to help.
Make a 3D blue solid and set the X Rotation to 90 degrees. Then put the particular emitter below this layer, and go into the Physics tab of the Particular effect and set the gravity to a negative value, and change the Physics Model from Air to Bounce. Go into the Bounce tab. Now set the Floor Layer to the 3D solid, and the Floor Mode to Layer Size. Make the Collision Event Slide instead of Bounce, and the particles should do what you want them to do. Last thing is, you need to go to the Visibility tab and set the Obscuration Layer to the 3D solid and put the Particle layer above the 3D solid. Now you can customize the particles!
Hope that helps! ?

[Yonner Draas]

Is this what you are looking for?
https://www.youtube.com/watch?v=Fre8sbNYMys
EDIT – I’m sorry, I didn’t read it properly, it is indeed very tricky to animate smoke “around” the window… I can’t help you yet.

[Yonner Draas]

Is this what you are looking for?
https://www.youtube.com/watch?v=Fre8sbNYMys
I made it very quickly, also I’m not sure if it’s exactly what you’re looking for.