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The Active Bodies Solver node is used to specify the scene geometry which will partake in the Active Bodies simulation. By default, all geometries in the scene are Solid and act as obstacles to the Phoenix fluid simulation. Active Bodies go one step further and can be pushed by the fluid or can float over the liquid surface, unlike Solid obstacles which stay in place and just obstruct the movement of the fluid. Additionally, just like the movement Solid bodies can be animated, the movement of the Active Bodies can be animated as well, so that an Active Body both follows a trajectory, and also gets influenced at the same time gets pushed by the fluid's movement. You can balance between the influence of the animation and the fluid from an Active Body's right click properties' Original Animation Influence option.

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