Game Development Reference
In-Depth Information
Matrix3 getTensor();
* Creates a new aerodynamic control surface with the given
* properties.
AeroControl(const Matrix3 &base, const Matrix3 &min,
const Matrix3 &max, const Vector3 &position,
const Vector3 *windspeed);
* Sets the control position of this control. This
* should range between -1 (in which case the minTensor value is
* used) through 0 (where the base-class tensor value is used)
* to +1 (where the maxTensor value is used). Values outside that
* range give undefined results.
void setControl(real value);
* Applies the force to the given rigid body.
virtual void updateForce(RigidBody *body, real duration);
Each control surface has an input, wired to the player's (or AI's) control. It ranges
1, where 0 is considered the “normal” position. The three tensors match
these three positions. Two of the three tensors are blended together to form a current
aerodynamic tensor for the setting of the surface. This tensor is then converted into
world coordinates and used as before.
Putting It Together
On the CD the flightsim demo shows this force generator in operation. You control
a model aircraft (seen from the ground for a bit of added challenge). The only forces
applied to the aircraft are gravity (represented as an acceleration value) and the aero-
dynamic forces from surface and control surface force generators. Figure 11.1 shows
the aircraft in action.
I have used four control surfaces: two wings, a tailplane, and a rudder. The tail-
plane is a regular surface force generator, with no control inputs (in a real plane the
tailplane usually does have control surfaces, but we don't need them). It has the aero-
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