What we’ll do
In this FumeFX Void sources video, we’ll take a look at Void source feature, it is really similar to any simple fluid source, but it works in an other way. It will define where you will be able to calculate the simulation, so, imagine this 3D shape, (sphere, cylinder and/or cube), it will be a container to say which voxel will be used and which will be erased and not used. You can decide shape and dimensions, you can move it around, you can say if it is active or not and more important, if the effect is inverted or not. By default it is inverted, and it means that just the voxels inside the void volume will be used, but if you like, you can change it and use it to say that all the voxels inside the void volume must be erased during the simulation. It will be able to speed up calculation and to optimize cache, it can be useful for example, to erave voxels too distant from the camera.