# Fan Property Editor

To create a fan control object: Choose Get Force Fan from the Simulate toolbar, Get Primitive Control Object Fan from the other toolbars, or Create Force Fan from the Hair toolbar.

To redisplay this property editor: Select the fan object and press Enter.

A Fan force simulates the effect of a "local" wind blowing via a cylinder on other objects. The wind's direction follows with cylinder's axis, while wind's intensity falls off from the center to the cylinder's border, moving from bottom to top.

Fan has no effect on Soft body simulations.

For more information on forces in general, see Forces [ Simulation and Effects].

To use this force in an ICE tree, see Creating and Applying ICE Forces to ICE Simulations [ICE Guide].

See the parameters in the table below that match the letters in this image.

 Name The name of the force. Mute Toggles on/off the force effect. Velocity (C) Speed of the fan's force. Flow Viscosity The amount of resistance the simulated objects have to the fan's force. A fan force with low viscosity values makes the simulated objects resist motion more strongly, thereby slowing down their flow. Use Size Uses size of the simulated objects in the fan force's calculations. Radius (B) Radius of the fan's cylinder. Drop Length (A) Length of the fan's cylinder.

## Decay

 Radial Falloff (decay) along the fan's Radius starting from its center and moving to its outer edges. A value of 0 is no decay so a simulated object would have the same amount of influence on it throughout the radius of the cylinder. A value of 1 is a linear decay so the fan would have full influence at its center and less influence as the simulated object gets closer to the radius edge where its influence is 0. A value of 2 is the same as 1 except that it produces a quadratic, smooth falloff. Axial Falloff along the fan's cylinder axis starting from the point of its origin and moving to its end (Drop Length). A value of 0 is no decay so a simulated object would have the same amount of influence on it throughout the length of the cylinder. A value of 1 is a linear decay so the fan would have full influence at its origin and less influence as the simulated object gets closer to the end of the cylinder where its influence is 0. A value of 2 is the same as 1 except that it produces a quadratic, smooth falloff.