add an unfinished and disable sway animation

data/treeConstants.tres

@@ -13,7 +13,7 @@ stabilityPerBranch = -1.0
 stabilityPerRoot = 1.2
 minGrowthLength = 4.0
 maxGrowthLength = 15.0
-maxGrowthAngle = 30.0
+maxGrowthAngle = 40.0
 maxBranchChildren = 2.0
 minRotationDifference = 20.0
 requiredEnergyForRootGrowth = 2.4

scripts/branch.gd

@@ -20,16 +20,23 @@ export(float) var thickness
 
 
 var branchParents = 0
+var originalRotation
 
 
 func _enter_tree():
     updateThickness()
     updateBranchParents()
 
+    originalRotation = rotation_degrees
+
 
 func _process(delta):
     updatePosition()
 
+    # DISABLED because I did not have enough time to tweak this
+    # animation and it looked weird...
+    # animateSwayInWind()
+
     # destroy the branch if it overlaps the ground
     if $end.global_position.y * growDirection < 0:
         if not has_node('placeholder'):
@@ -41,6 +48,19 @@ func isLeaf() -> bool:
     return $children.get_child_count() == 0
 
 
+func animateSwayInWind():
+    # only sway branches above ground
+    if growDirection >= 0:
+        return
+
+    var timeConstant = (OS.get_ticks_msec() as float) / 1000
+
+    # delay branches further up the tree
+    timeConstant -= branchParents * 1.5
+
+    rotation_degrees = originalRotation + 2 * sin(timeConstant)
+
+
 func updatePosition():
     # update the relative position of this branch based on the length
     # of the parent