public PhyFlipper(FlipperBehavior flipper) : base(PhyType.Flipper)
{
Mass = flipper.data.Mass * 3.0f;
RotationDirection = flipper.data.StartAngle > flipper.data.EndAngle ? -1 : 1;
_height = flipper.data.Height;
_startAngle = flipper.data.StartAngle * Mathf.PI / 180.0f;
_endAngle = flipper.data.EndAngle * Mathf.PI / 180.0f;
SetupRigidBody(flipper.data.Mass, _AddFlipperCylinders(flipper));
SetProperties(
Mass,
flipper.data.Friction,
flipper.data.Elasticity * 100.0f);
base.matrix = Matrix4x4.TRS(
flipper.gameObject.transform.localPosition,
flipper.gameObject.transform.localRotation,
UnityEngine.Vector3.one
).ToBullet();
base.name = flipper.name;
base.entity = Entity.Null;
}
CollisionShape _AddFlipperCylinders(FlipperBehavior flipper)
{
float r1 = flipper.data.BaseRadius;
float r2 = flipper.data.EndRadius;
float h = flipper.data.Height;
float l = flipper.data.FlipperRadius;
var hh = h * 0.5f; // half height
var cs = new BulletSharp.CompoundShape();
cs.AddChildShape(
Matrix.Translation(0, 0, hh),
new CylinderShapeZ(r1, r1, hh));
cs.AddChildShape(
Matrix.Translation(0, -l, hh),
new CylinderShapeZ(r2, r2, hh));
// we can't add Triangle Mesh Shape to Compound Shape. Add one or two boxes
float hbl = new Vector2(l, r1 - r2).magnitude * 0.5f;
Vector3 n = new Vector3(l, r1 - r2, 0); n.Normalize();
Vector3 beg = new Vector3(0, 0, hh) + n * (r1 - r2);
Vector3 beg2 = new Vector3(-beg.X, beg.Y, beg.Z);
Vector3 end = new Vector3(0, -l, hh);
float angle = math.atan2(n.Y, n.X);
bool onlyFront = true;
bool rev = (flipper.data.StartAngle < 0 | flipper.data.StartAngle > 180);
if (!onlyFront || rev)
{
cs.AddChildShape(
Matrix.RotationZ(-angle) *
Matrix.Translation((beg + end) * 0.5f),
new BoxShape(Mathf.Min(r1, r2), hbl, hh));
}
if (!onlyFront || !rev)
{
cs.AddChildShape(
Matrix.RotationZ(angle) *
Matrix.Translation((beg2 + end) * 0.5f),
new BoxShape(Mathf.Min(r1, r2), hbl, hh));
}
return(cs);
}
protected override void OnEnable()
{
base.OnEnable();
_flipper = (FlipperBehavior)target;
}
