public override void CopyParametersTo( ParticleSystemRenderer other )
{
BillboardParticleRenderer otherBpr = (BillboardParticleRenderer)other;
Debug.Assert( otherBpr != null );
otherBpr.BillboardType = this.BillboardType;
otherBpr.CommonUpVector = this.CommonUpVector;
otherBpr.CommonDirection = this.CommonDirection;
}
#endregion