// =============================================================================================================
/// <summary>
/// This function will be called when the ECS system decides to convert this GameObject to an equivalent ECS...
/// ...Entity, allowing us to add the component this MonoBehaviour represents.
/// </summary>
/// <param name="entity"></param>
/// <param name="dstManager"></param>
/// <param name="conversionSystem"></param>
public void Convert(Entity entity, EntityManager dstManager, GameObjectConversionSystem conversionSystem)
{
//First create the actual component and setup its data based on exposed properties.
var rotationComponent = new RotationVelocity();
//Notice that this is not a reference, but a value that will be copied to the Entity Manager.
rotationComponent.rotatingVelocity = rotationVelocity;
//Tell the entity manager that this Component belongs to the entity we are converting.
dstManager.AddComponentData(entity, rotationComponent);
}
// =============================================================================================================
/// <summary>
/// This function has the logic to apply to all entities with Rotation and RotationVelocity...
/// ...components every frame
/// </summary>
/// <param name="entity">Entity that will come from our for each</param>
/// <param name="rotation"></param>
/// <param name="rotationVelocity"></param>
private void RotateEntity(Entity entity, ref Rotation rotation, ref RotationVelocity rotationVelocity)
{
//We get the velocity specified in the component, apply delta time and convert degrees to radians.
float rotationAmount = rotationVelocity.rotatingVelocity * Time.deltaTime * Mathf.Deg2Rad;
//Create a quaternion that represents the desired amount of rotation.
//Notice that this quaternion is not the same as the default Quaternion of MonoBehaviours.
quaternion rotationQuat = quaternion.Euler(0, rotationAmount, 0);
//Apply the desired rotation multiplying current rotation by the quaternion
quaternion newRotation = math.mul(rotation.Value, rotationQuat);
//Override the current rotation with the new rotated rotation;
rotation.Value = newRotation;
}