CURA-4269 disable auto-drop for first time loaded models from project files

1 files changed, 10 insertions, 1 deletions

diff --git a/cura/PlatformPhysics.py b/cura/PlatformPhysics.py
index b00c5a632c..464e9682a6 100755
--- a/cura/PlatformPhysics.py
+++ b/cura/PlatformPhysics.py
@@ -9,6 +9,7 @@ from UM.Scene.Iterator.BreadthFirstIterator import BreadthFirstIterator
 from UM.Math.Vector import Vector
 from UM.Scene.Selection import Selection
 from UM.Preferences import Preferences
+from UM.Logger import Logger
 
 from cura.ConvexHullDecorator import ConvexHullDecorator
 
@@ -67,10 +68,18 @@ class PlatformPhysics:
 
             # Move it downwards if bottom is above platform
             move_vector = Vector()
-            if Preferences.getInstance().getValue("physics/automatic_drop_down") and not (node.getParent() and node.getParent().callDecoration("isGroup")) and node.isEnabled(): #If an object is grouped, don't move it down
+
+            # Check if this is the first time a project file node was loaded (disable auto drop in that case), defaults to True
+            should_auto_drop = node.getSetting("auto_drop", True)
+
+            # If a node is grouped or it's loaded from a project file (auto-drop disabled), don't move it down
+            if Preferences.getInstance().getValue("physics/automatic_drop_down") and not (node.getParent() and node.getParent().callDecoration("isGroup")) and node.isEnabled() and should_auto_drop:
                 z_offset = node.callDecoration("getZOffset") if node.getDecorator(ZOffsetDecorator.ZOffsetDecorator) else 0
                 move_vector = move_vector.set(y=-bbox.bottom + z_offset)
 
+            # Enable auto-drop after processing the project file node for the first time
+            node.setSetting("auto_drop", False)
+
             # If there is no convex hull for the node, start calculating it and continue.
             if not node.getDecorator(ConvexHullDecorator):
                 node.addDecorator(ConvexHullDecorator())