Blocking the Wind

[Jim Scott]

By virtue of its symbology in the viewport, the Wind object tends to give the impression that it is “blowing” air from a certain position. But like other similar modifiers (“gravity” and “turbulence,” for example) it is simply applying a force to the particles in the scene regardless of where its icon happens to be located. Unless it has a falloff applied its position is completely irrelevant, which means that moving an object “between” it and the emitter isn’t really doing anything. Its force is being applied everywhere, and not from one position (the “fan,” so to speak) to another. If you want it to look like wind is being “blocked” by the cube simply keyframe the “Wind Speed” or the “Enabled” parameter to coincide with the movement of the cube.

[Justin Thomson]

Thanks Jim,

Looks like everyone is confirming my doubt about doing a “simulation”. Perhaps that is a limitation of c4d, good thing all I need is a proof of concept. Thanks for looking into it for me.

When you get to the top, don’t forget to send the elevator down for the next guy

[Brian Jones]

it’s possible with Falloff of the Wind. One wind blows the particles and another wind with a Box falloff that follows the cube (Child) blowing in the opposite direction will do what you are looking for I think.

14158_windblock.c4d.zip

[Jim Scott]

Very clever Brian. That got me thinking about using a falloff on the original wind object and parenting it to the cube. Something like this:

14159_windblock2.c4d.zip

[Brian Jones]

Can’t view it at the moment but I’m guessing inverse the box falloff to do it with one wind

[Jim Scott]

[Brian Jones] “Can’t view it at the moment but I’m guessing inverse the box falloff to do it with one wind”

Well, that would work as well, but I just enlarged and positioned the box falloff so that it enclosed the emitter while the cube was to the side and then moved clear of the emitter as the cube moved.