add_mesh_extra_objects/add_mesh_solid.py

@@ -325,6 +325,26 @@ def createSolid(plato, vtrunc, etrunc, dual, snub):
         return dvOutput, dfOutput
 
 
+def fixup_normals(obj):
+    """
+    Some of the presets have their faces with wrong normals. This fixes them.
+    """
+    curr_active = bpy.context.view_layer.objects.active
+
+    # Select new object,
+    bpy.ops.object.select_all(action='DESELECT')
+    obj.select_set(True)
+    bpy.context.view_layer.objects.active = obj
+
+    bpy.ops.object.mode_set(mode='EDIT')
+    bpy.ops.mesh.select_all(action='SELECT')  # select all faces
+    bpy.ops.mesh.normals_make_consistent(inside=False)
+    bpy.ops.object.editmode_toggle()  # return to object mode
+
+    # Reset to previously active
+    bpy.context.view_layer.objects.active = curr_active
+
+
 class Solids(bpy.types.Operator):
     """Add one of the (regular) solids (mesh)"""
     bl_idname = "mesh.primitive_solid_add"
@@ -509,7 +529,10 @@ class Solids(bpy.types.Operator):
         # Update mesh geometry after adding stuff.
         mesh.update()
 
-        object_data_add(context, mesh, operator=None)
+        obj = object_data_add(context, mesh, operator=None)
+
+        fixup_normals(obj)
+
         # object generation done
 
         return {'FINISHED'}