BIM: Fixes appearance defects coming from recent transparency and FreeCAD#18298

Author: yorikvanhavre

src/Mod/BIM/nativeifc/ifc_generator.py

@@ -464,13 +464,23 @@ def set_cache(ifcfile, cache):
 def set_representation(vobj, node):
     """Sets the correct coin nodes for the given Part object"""
 
+    def find_node(parent, nodetype):
+        for i in range(parent.getNumChildren()):
+            if isinstance(parent.getChild(i), nodetype):
+                return parent.getChild(i)
+        return None
+
     # node = [colors, verts, faces, edges, parts]
     if not vobj.RootNode:
         return
     if vobj.RootNode.getNumChildren() < 3:
         return
-    coords = vobj.RootNode.getChild(1)  # SoCoordinate3
-    switch = vobj.RootNode.getChild(2)
+    coords = find_node(vobj.RootNode, coin.SoCoordinate3)
+    if not coords:
+        return
+    switch = find_node(vobj.RootNode, coin.SoSwitch)
+    if not switch:
+        return
     num_modes = switch.getNumChildren()
     if num_modes < 3:
         return

src/Mod/BIM/nativeifc/ifc_tools.py

@@ -942,7 +942,7 @@ def set_colors(obj, colors):
             if len(colors) > 1:
                 #colors[0] = colors[0][:3] + (0.0,)
                 # TEMP HACK: if multiple colors, set everything to opaque because it looks wrong
-                colors = [color[:3] + (0.0,) for color in colors]
+                colors = [color[:3] + (1.0,) for color in colors]
             sapp = []
             for color in colors:
                 sapp_mat = FreeCAD.Material()