From 1ef278b0610691143e87e45b28df7ca2c49b09bc Mon Sep 17 00:00:00 2001
From: Russell Johnson <47639332+Russ4262@users.noreply.github.com>
Date: Fri, 5 Jun 2020 14:50:54 -0500
Subject: [PATCH] Path: Fix initial guess for FinalDepth with no Base Geometry

---
 src/Mod/Path/PathScripts/PathSurface.py | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/Mod/Path/PathScripts/PathSurface.py b/src/Mod/Path/PathScripts/PathSurface.py
index 5e05ee6252..caa4733607 100644
--- a/src/Mod/Path/PathScripts/PathSurface.py
+++ b/src/Mod/Path/PathScripts/PathSurface.py
@@ -436,6 +436,17 @@ class ObjectSurface(PathOp.ObjectOp):
                     except Part.OCCError as e:
                         PathLog.error(e)
             obj.OpFinalDepth = zmin
+        elif self.job:
+            if hasattr(obj, 'BoundBox'):
+                if obj.BoundBox == 'BaseBoundBox':
+                    models = self.job.Model.Group
+                    zmin = models[0].Shape.BoundBox.ZMin
+                    for M in models:
+                        zmin = min(zmin, M.Shape.BoundBox.ZMin)
+                    obj.OpFinalDepth = zmin
+                if obj.BoundBox == 'Stock':
+                    models = self.job.Stock
+                    obj.OpFinalDepth = self.job.Stock.Shape.BoundBox.ZMin
 
     def opExecute(self, obj):
         '''opExecute(obj) ... process surface operation'''