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This simulation area mode moves the active area with the brush. When enabled, the cloth brush has no restrictions on stroke length, area or mesh vertex count. In order to work, this enables PBVH nodes dynamically for simulation as the stroke location moves and builds the constraints for new nodes during the stroke. When a node is not inside the simulated area, all the constraints that were created for it and vertex collisions are not computed. The simulation limits falloff areas and constraints tweaking control how the simulated and no simulated nodes blend. Reviewed By: sergey, zeddb Differential Revision: https://developer.blender.org/D8726