The difference between the Solid Object that we had before, and this Non-Solid with Clear Inside, is that the fluid moves around Solids but passes right through the Non-Solids. This way you can use Non-Solids with Clear Inside to erase Smoke, Temperature, Liquid, or different particles from certain areas of the Simulator without effecting the fluid's behavior. While the simulation continues, create another Box in the scene that is a similar size to the first one. Move it up, inside the container in the path of the Smoke, and it traps some of the Smoke inside it, as in the image. When creating or moving a Solid Object inside a Fire/Smoke simulation container, it can trap fluid channels inside itself. Note that this behavior does not apply to a Liquid Simulator. Move this box around some more and you can see that some of the Smoke trapped inside the volume earlier is still stuck inside, and it may capture more. Again, that’s because by default, all objects are treated as Solid Objects, so the Smoke can’t escape once inside. |