/// <summary>
/// The location is first saved and the model is translated
/// to the origin before any rotations are applied. Objects rotate about their
/// center. After rotations, the location is reset and updated iff it is not
/// outside the range of the stage (stage.withinRange(String name, Vector3 location)).
/// When movement would exceed the stage's boundaries the model is not moved
/// and a message is displayed.
///
/// AGMGSK is a terrain based 3D environment, so rotations are on Y.
/// Therefore an Euler rotation method is adopted below. MonoGames supports both
/// Matrix.CreateFromAxisAngle(...) and CreateFromQuaternion(...) rotations
/// for more complex 3D environments.
/// </summary>
public void updateMovableObject()
{
Vector3 startLocation, stopLocation;
startLocation = stopLocation = Translation; // set for current location
Orientation *= Matrix.CreateTranslation(-1 * Translation); // move to origin
// Euler rotations
Orientation *= Matrix.CreateRotationY(yaw); // rotate
Orientation *= Matrix.CreateRotationX(pitch);
Orientation *= Matrix.CreateRotationZ(roll);
stopLocation += ((step * stepSize) * Forward); // move forward
// assume no collision possible if moving off terrain
if (stage.withinRange(this.Name, stopLocation)) // on terrain, check collision
{
if (model.IsCollidable && collision(stopLocation)) // collision
{
Orientation *= Matrix.CreateTranslation(startLocation); // restore position
}
else // no collision and on suface move
{
Orientation *= Matrix.CreateTranslation(stopLocation); // move forward
}
}
else // off terrain, don't move
{
Orientation *= Matrix.CreateTranslation(startLocation); // restore position
}
}
/// <summary>
/// The location is first saved and the model is translated
/// to the origin before any rotations are applied. Objects rotate about their
/// center. After rotations, the location is reset and updated iff it is not
/// outside the range of the stage (stage.withinRange(String name, Vector3 location)).
/// When movement would exceed the stage's boundaries the model is not moved
/// and a message is displayed.
///
/// AGMGSK is a terrain based 3D environment, so rotations are on Y.
/// Therefore an Euler rotation method is adopted below. MonoGames supports both
/// Matrix.CreateFromAxisAngle(...) and CreateFromQuaternion(...) rotations
/// for more complex 3D environments.
/// </summary>
///
// Modded to return the object it is colliding with, if no collision return null
public Object3D updateMovableObject()
{
Object3D obj3d = null;
Vector3 startLocation, stopLocation;
startLocation = stopLocation = Translation; // set for current location
Orientation *= Matrix.CreateTranslation(-1 * Translation); // move to origin
// Euler rotations
Orientation *= Matrix.CreateRotationY(yaw); // rotate
Orientation *= Matrix.CreateRotationX(pitch);
Orientation *= Matrix.CreateRotationZ(roll);
stopLocation += ((step * stepSize) * Forward); // move forward
// assume no collision possible if moving off terrain
if (stage.withinRange(this.Name, stopLocation)) // on terrain, check collision
{
obj3d = CollidedWith(stopLocation);
if (model.IsCollidable && Collision(obj3d)) // collision ==> code left similar for clarity
{
Orientation *= Matrix.CreateTranslation(startLocation);
return(obj3d);
} // restore position
else // no collision and on suface move
{
Orientation *= Matrix.CreateTranslation(stopLocation); // move forward
}
}
else // off terrain, don't move
{
Orientation *= Matrix.CreateTranslation(startLocation); // restore position
}
return(null);
}
