9.0

184 RIGID BODIES
DYNAMICS
DYNAMICS
RIGID BODIES 185
Aerodynamics Tab
Note that the Wind eld
contains similar parameters
(with the exception of Double-
Sided). The parameters in the
Wind eld set the general
aerodynamics behavior while
the parameters here are used to
ne-tune the aerodynamics for
the rigid body.
You can use this tab’s parameters to modify the aerodynamic behavior of the rigid
body. The parameters here will be multiplied with those in the Wind eld. For example,
if you have set Impact to 50% in the Rigid Body Dynamic tag’s settings and 80% in
the Wind eld, the resulting value for the rigid body will be 40%.
Suppose you have 20 rigid bodies inside a Wind eld. The wind settings are working
well for 19 of the rigid bodies but the other rigid body is not moving as it should. If
you try to correct the ight of this one rigid body by adjusting the parameters in the
Wind eld, you might nd that doing this would ruin the ight of the other 19 rigid
bodies. A better solution is to modify the parameters on the Aerodynamics tab of
the rogue rigid body.
Double-Sided
If this option is disabled — the default setting — the wind will affect only those
polygons whose surface normals are facing the wind. If you enable the option, the
wind will exert its force on all polygons regardless of the direction in which their
surface normals are pointing. Only enable the Double-Sided option if your object has
no thickness and Lift is set to 0%.