feat: make directional movements based on model rotation and not world axes

dGame/dComponents/ModelComponent.cpp

@@ -46,6 +46,9 @@ bool ModelComponent::OnResetModelToDefaults(GameMessages::ResetModelToDefaults&
 	if (reset.bResetPos) m_Parent->SetPosition(m_OriginalPosition);
 	if (reset.bResetRot) m_Parent->SetRotation(m_OriginalRotation);
 	m_Parent->SetVelocity(NiPoint3Constant::ZERO);
+	m_MoveDirection = NiPoint3Constant::ZERO;
+	m_WasMoving = false;
+	SyncLinearVelocity();
 	ResetRotationState(m_Parent->GetRotation());
 
 	m_Speed = 3.0f;
@@ -81,6 +84,9 @@ void ModelComponent::Update(float deltaTime) {
 		behavior.Update(deltaTime, *this);
 	}
 
+	// Done after all behaviors so the heading reflects any rotation applied this frame
+	SyncLinearVelocity();
+
 	if (!m_RestartAtEndOfFrame) return;
 
 	GameMessages::ResetModelToDefaults reset{};
@@ -289,32 +295,33 @@ void ModelComponent::RemoveUnSmash() {
 	m_NumActiveUnSmash--;
 }
 
-bool ModelComponent::TrySetVelocity(const NiPoint3& velocity) const {
-	auto currentVelocity = m_Parent->GetVelocity();
+bool ModelComponent::TryStartMove(const int axis, const float direction) {
+	if (axis < 0 || axis > 2 || direction == 0.0f) return false;
+	if (m_MoveDirection[axis] != 0.0f) return false;
 
-	// If we're currently moving on an axis, prevent the move so only 1 behavior can have control over an axis
-	if (velocity != NiPoint3Constant::ZERO) {
-		const auto [x, y, z] = velocity * m_Speed;
-		if (x != 0.0f) {
-			if (currentVelocity.x != 0.0f) return false;
-			currentVelocity.x = x;
-		} else if (y != 0.0f) {
-			if (currentVelocity.y != 0.0f) return false;
-			currentVelocity.y = y;
-		} else if (z != 0.0f) {
-			if (currentVelocity.z != 0.0f) return false;
-			currentVelocity.z = z;
-		}
-	} else {
-		currentVelocity = velocity;
-	}
-
-	m_Parent->SetVelocity(currentVelocity);
+	m_MoveDirection[axis] = direction > 0.0f ? 1.0f : -1.0f;
 	return true;
 }
 
-void ModelComponent::SetVelocity(const NiPoint3& velocity) const {
-	m_Parent->SetVelocity(velocity);
+void ModelComponent::StopMove(const int axis) {
+	if (axis < 0 || axis > 2) return;
+	m_MoveDirection[axis] = 0.0f;
+}
+
+void ModelComponent::SyncLinearVelocity() {
+	const auto& rotation = m_Parent->GetRotation();
+	m_MoveBasis = { QuatUtils::Right(rotation), QuatUtils::Up(rotation), QuatUtils::Forward(rotation) };
+
+	NiPoint3 velocity = NiPoint3Constant::ZERO;
+	for (int axis = 0; axis < 3; axis++) velocity += m_MoveBasis[axis] * (m_MoveDirection[axis] * m_Speed);
+
+	// Leave velocity alone unless a move owns it, e.g. pets are driven elsewhere
+	const bool isMoving = velocity != NiPoint3Constant::ZERO;
+	if (!isMoving && !m_WasMoving) return;
+	m_WasMoving = isMoving;
+
+	// Setting velocity always marks it dirty for serialization
+	if (velocity != m_Parent->GetVelocity()) m_Parent->SetVelocity(velocity);
 }
 
 bool ModelComponent::TryStartRotation(const int axis, const float direction) {

dGame/dComponents/ModelComponent.h

@@ -139,13 +139,15 @@ public:
 
 	void Resume();
 
-	// Attempts to set the velocity of an axis for movement.
-	// If the axis currently has a velocity of zero, returns true.
-	// If the axis is currently controlled by a behavior, returns false.
-	bool TrySetVelocity(const NiPoint3& velocity) const;
+	// Attempts to claim a local axis (0 = right, 1 = up, 2 = forward) for movement in direction (+1 or -1).
+	// Returns false if the axis is already controlled by a behavior.
+	bool TryStartMove(const int axis, const float direction);
 
-	// Force sets the velocity to a value.
-	void SetVelocity(const NiPoint3& velocity) const;
+	// Releases the local axis so another behavior can move along it.
+	void StopMove(const int axis);
+
+	// World space direction of the local axis used for the most recently applied velocity.
+	const NiPoint3& GetMoveAxis(const int axis) const { return m_MoveBasis[axis]; }
 
 	// Attempts to claim a world axis (0 = x, 1 = y, 2 = z) for rotation in direction (+1 or -1).
 	// Returns false if the axis is already controlled by a behavior.
@@ -186,6 +188,9 @@ private:
 	// Sends the client-side angular velocity for the currently active rotation axes.
 	void SyncAngularVelocity() const;
 
+	// Recomputes the linear velocity from the active move axes and the current rotation.
+	void SyncLinearVelocity();
+
 	// Clears all rotation state and makes rotation relative to newBase.
 	void ResetRotationState(const NiQuaternion& newBase);
 
@@ -248,4 +253,13 @@ private:
 
 	// Per axis -1, 0 or 1. Non-zero means a behavior currently owns rotation on that axis.
 	NiPoint3 m_RotationDirection{};
+
+	// Per local axis (right, up, forward) -1, 0 or 1. Non-zero means a behavior currently owns movement on that axis.
+	NiPoint3 m_MoveDirection{};
+
+	// Right, up and forward in world space as of the last velocity update
+	std::array<NiPoint3, 3> m_MoveBasis{ NiPoint3Constant::UNIT_X, NiPoint3Constant::UNIT_Y, NiPoint3Constant::UNIT_Z };
+
+	// Whether the last velocity update came from an active move
+	bool m_WasMoving{ false };
 };

dGame/dPropertyBehaviors/Strip.cpp

@@ -174,30 +174,23 @@ void Strip::ProcNormalAction(float deltaTime, ModelComponent& modelComponent, Up
 	// TODO replace with switch case and nextActionType with enum
 	/* BEGIN Move */
 	if (nextActionType == "MoveRight" || nextActionType == "MoveLeft") {
-		// X axis
-		bool isMoveLeft = nextActionType == "MoveLeft";
-		int negative = isMoveLeft ? -1 : 1;
-		// Default velocity is 3 units per second.
-		if (modelComponent.TrySetVelocity(NiPoint3Constant::UNIT_X * negative)) {
+		// Local right axis
+		const bool isMoveLeft = nextActionType == "MoveLeft";
+		if (modelComponent.TryStartMove(0, isMoveLeft ? -1.0f : 1.0f)) {
 			m_PreviousFramePosition = entity.GetPosition();
 			m_InActionTranslation.x = isMoveLeft ? -number : number;
 		}
 	} else if (nextActionType == "FlyUp" || nextActionType == "FlyDown") {
-		// Y axis
-		bool isFlyDown = nextActionType == "FlyDown";
-		int negative = isFlyDown ? -1 : 1;
-		// Default velocity is 3 units per second.
-		if (modelComponent.TrySetVelocity(NiPoint3Constant::UNIT_Y * negative)) {
+		// Local up axis
+		const bool isFlyDown = nextActionType == "FlyDown";
+		if (modelComponent.TryStartMove(1, isFlyDown ? -1.0f : 1.0f)) {
 			m_PreviousFramePosition = entity.GetPosition();
 			m_InActionTranslation.y = isFlyDown ? -number : number;
 		}
-
 	} else if (nextActionType == "MoveForward" || nextActionType == "MoveBackward") {
-		// Z axis
-		bool isMoveBackward = nextActionType == "MoveBackward";
-		int negative = isMoveBackward ? -1 : 1;
-		// Default velocity is 3 units per second.
-		if (modelComponent.TrySetVelocity(NiPoint3Constant::UNIT_Z * negative)) {
+		// Local forward axis
+		const bool isMoveBackward = nextActionType == "MoveBackward";
+		if (modelComponent.TryStartMove(2, isMoveBackward ? -1.0f : 1.0f)) {
 			m_PreviousFramePosition = entity.GetPosition();
 			m_InActionTranslation.z = isMoveBackward ? -number : number;
 		}
@@ -332,45 +325,26 @@ bool Strip::CheckMovement(float deltaTime, ModelComponent& modelComponent) {
 	auto& entity = *modelComponent.GetParent();
 	const auto& currentPos = entity.GetPosition();
 	const auto diff = currentPos - m_PreviousFramePosition;
-	const auto [moveX, moveY, moveZ] = m_InActionTranslation;
 	m_PreviousFramePosition = currentPos;
-	// Only want to subtract from the move if one is being performed.
-	// Starts at true because we may not be doing a move at all.
-	// If one is being done, then one of the move_ variables will be non-zero
-	bool moveFinished = true;
-	NiPoint3 finalPositionAdjustment = NiPoint3Constant::ZERO;
-	if (moveX != 0.0f) {
-		m_InActionTranslation.x -= diff.x;
-		// If the sign bit is different between the two numbers, then we have finished our move.
-		moveFinished = std::signbit(m_InActionTranslation.x) != std::signbit(moveX);
-		finalPositionAdjustment.x = m_InActionTranslation.x;
-	} else if (moveY != 0.0f) {
-		m_InActionTranslation.y -= diff.y;
-		// If the sign bit is different between the two numbers, then we have finished our move.
-		moveFinished = std::signbit(m_InActionTranslation.y) != std::signbit(moveY);
-		finalPositionAdjustment.y = m_InActionTranslation.y;
-	} else if (moveZ != 0.0f) {
-		m_InActionTranslation.z -= diff.z;
-		// If the sign bit is different between the two numbers, then we have finished our move.
-		moveFinished = std::signbit(m_InActionTranslation.z) != std::signbit(moveZ);
-		finalPositionAdjustment.z = m_InActionTranslation.z;
-	}
 
-	// Once done, set the in action move & velocity to zero
-	if (moveFinished && m_InActionTranslation != NiPoint3Constant::ZERO) {
-		auto entityVelocity = entity.GetVelocity();
-		// Zero out only the velocity that was acted on
-		if (moveX != 0.0f) entityVelocity.x = 0.0f;
-		else if (moveY != 0.0f) entityVelocity.y = 0.0f;
-		else if (moveZ != 0.0f) entityVelocity.z = 0.0f;
-		modelComponent.SetVelocity(entityVelocity);
+	for (int axis = 0; axis < 3; axis++) {
+		const float target = m_InActionTranslation[axis];
+		if (target == 0.0f) continue;
+
+		// The local axes are orthonormal so this isolates our axis from any other active moves
+		const auto& axisVector = modelComponent.GetMoveAxis(axis);
+		m_InActionTranslation[axis] -= diff.DotProduct(axisVector);
+
+		// If the sign bit is different between the two numbers, then we have finished our move.
+		if (std::signbit(m_InActionTranslation[axis]) == std::signbit(target)) return false;
 
 		// Do the final adjustment so we will have moved exactly the requested units
-		entity.SetPosition(entity.GetPosition() + finalPositionAdjustment);
+		entity.SetPosition(entity.GetPosition() + axisVector * m_InActionTranslation[axis]);
+		modelComponent.StopMove(axis);
 		m_InActionTranslation = NiPoint3Constant::ZERO;
 	}
 
-	return moveFinished;
+	return true;
 }
 
 bool Strip::CheckRotation(float deltaTime, ModelComponent& modelComponent) {

dGame/dPropertyBehaviors/Strip.h

@@ -65,7 +65,7 @@ private:
 	// The location of this strip on the UGBehaviorEditor UI
 	StripUiPosition m_Position;
 
-	// The current actions remaining translation to the target
+	// The current actions remaining translation to the target along the model's local right (x), up (y) and forward (z) axes.
 	// Only 1 of these vertexs' will be active at once for any given strip.
 	NiPoint3 m_InActionTranslation{};