add new node called Set Look at Rotation

leenkx/Sources/leenkx/logicnode/SetLookAtRotationNode.hx

@@ -0,0 +1,190 @@
+package leenkx.logicnode;
+
+import iron.math.Vec4;
+import iron.math.Quat;
+import iron.math.Mat4;
+import iron.object.Object;
+
+class SetLookAtRotationNode extends LogicNode {
+
+	public var property0: String; // Axis to align
+	public var property1: String; // Use vector for target (true/false)
+	public var property2: String; // Use vector for source (true/false)
+	public var property3: String; // Damping value (backward compatibility, now input socket)
+	public var property4: String; // Disable rotation on aligning axis (true/false)
+	
+	// Store the calculated rotation for output
+	var calculatedRotation: Quat = null;
+	// Store the previous rotation for smooth interpolation
+	var previousRotation: Quat = null;
+
+	public function new(tree: LogicTree) {
+		super(tree);
+		previousRotation = new Quat();
+	}
+
+	override function run(from: Int): Void {
+		// Determine if we're using a vector or an object as source
+		var useSourceVector: Bool = property2 == "true";
+		var objectToUse: Object = null;
+		var objectLoc: Vec4 = null;
+
+		if (useSourceVector) {
+			// Use tree.object as the object to rotate
+			objectToUse = tree.object;
+			if (objectToUse == null) {
+				runOutput(0);
+				return;
+			}
+
+			// Get the source location directly
+			objectLoc = inputs[1].get();
+			if (objectLoc == null) {
+				runOutput(0);
+				return;
+			}
+		} else {
+			// Get the source object (or fallback to tree.object)
+			objectToUse = (inputs.length > 1 && inputs[1] != null) ? inputs[1].get() : tree.object;
+			if (objectToUse == null) {
+				runOutput(0);
+				return;
+			}
+
+			// Get source object's position
+			objectLoc = objectToUse.transform.loc;
+		}
+
+		// Determine if we're using a vector or an object as target
+		var useTargetVector: Bool = property1 == "true";
+		var targetLoc: Vec4 = null;
+
+		if (useTargetVector) {
+			// Get the target location directly
+			targetLoc = inputs[2].get();
+			if (targetLoc == null) {
+				runOutput(0);
+				return;
+			}
+		} else {
+			// Get the target object
+			var targetObject: Object = inputs[2].get();
+			if (targetObject == null) {
+				runOutput(0);
+				return;
+			}
+			
+			// Get target object's position
+			targetLoc = targetObject.transform.loc;
+		}
+		
+		// Calculate direction to target
+		var direction = new Vec4(
+			targetLoc.x - objectLoc.x,
+			targetLoc.y - objectLoc.y,
+			targetLoc.z - objectLoc.z
+		);
+		direction.normalize();
+		
+		// Calculate target rotation based on selected axis
+		calculatedRotation = new Quat();
+		switch (property0) {
+			case "X":
+				calculatedRotation.fromTo(new Vec4(1, 0, 0), direction);
+			case "-X":
+				calculatedRotation.fromTo(new Vec4(-1, 0, 0), direction);
+			case "Y":
+				calculatedRotation.fromTo(new Vec4(0, 1, 0), direction);
+			case "-Y":
+				calculatedRotation.fromTo(new Vec4(0, -1, 0), direction);
+			case "Z":
+				calculatedRotation.fromTo(new Vec4(0, 0, 1), direction);
+			case "-Z":
+				calculatedRotation.fromTo(new Vec4(0, 0, -1), direction);
+		}
+		
+		// If disable rotation on aligning axis is enabled, constrain the target rotation
+		if (property4 == "true") {
+			// Apply constraint to the target rotation BEFORE damping to avoid jiggling
+			var eulerAngles = calculatedRotation.toEulerOrdered("XYZ");
+			
+			// Set the rotation around the selected axis to 0
+			switch (property0) {
+				case "X", "-X":
+					eulerAngles.x = 0.0;
+				case "Y", "-Y":
+					eulerAngles.y = 0.0;
+				case "Z", "-Z":
+					eulerAngles.z = 0.0;
+			}
+			
+			// Convert back to quaternion
+			calculatedRotation.fromEulerOrdered(eulerAngles, "XYZ");
+		}
+		
+		// Apply rotation with damping
+		var dampingValue: Float = 0.0;
+		
+		// Try to get damping from input socket first (index 3), fallback to property
+		if (inputs.length > 3 && inputs[3] != null) {
+			var dampingInput: Dynamic = inputs[3].get();
+			if (dampingInput != null) {
+				dampingValue = dampingInput;
+			}
+		} else {
+			// Fallback to property for backward compatibility
+			dampingValue = Std.parseFloat(property3);
+		}
+		
+		if (dampingValue > 0.0) {
+			// Create a fixed interpolation rate that never reaches exactly 1.0
+			// Higher damping = slower rotation (smaller step)
+			var step = Math.max(0.001, (1.0 - dampingValue) * 0.2); // 0.001 to 0.2 range
+			
+			// Get current rotation as quaternion
+			var currentRot = new Quat().setFrom(objectToUse.transform.rot);
+			
+			// Calculate the difference between current and target rotation
+			var diffQuat = new Quat();
+			// q1 * inverse(q2) gives the rotation from q2 to q1
+			var invCurrent = new Quat().setFrom(currentRot);
+			invCurrent.x = -invCurrent.x;
+			invCurrent.y = -invCurrent.y;
+			invCurrent.z = -invCurrent.z;
+			diffQuat.multquats(calculatedRotation, invCurrent);
+			
+			// Convert to axis-angle representation
+			var axis = new Vec4();
+			var angle = diffQuat.toAxisAngle(axis);
+			
+			// Apply only a portion of this rotation (step)
+			var partialAngle = angle * step;
+			
+			// Create partial rotation quaternion
+			var partialRot = new Quat().fromAxisAngle(axis, partialAngle);
+			
+			// Apply this partial rotation to current
+			var newRot = new Quat();
+			newRot.multquats(partialRot, currentRot);
+			
+			// Apply the new rotation
+			objectToUse.transform.rot.setFrom(newRot);
+		} else {
+			// No damping, apply instant rotation
+			objectToUse.transform.rot.setFrom(calculatedRotation);
+		}
+		
+		objectToUse.transform.buildMatrix();
+		
+		runOutput(0);
+	}
+
+	// Getter method for output sockets
+	override function get(from: Int): Dynamic {
+		// Output index 1 is the rotation socket (global rotation)
+		if (from == 1) {
+			return calculatedRotation;
+		}
+		return null;
+	}
+}