[Bf-extensions-cvs] [27381001] master: Fix T67889: Object Importer Error.

[Bastien Montagne]

Commit: 27381001d7b9332eb669f1023f14b40d1f15f962
Author: Bastien Montagne
Date:   Tue Jul 30 11:23:12 2019 +0200
Branches: master
https://developer.blender.org/rBA27381001d7b9332eb669f1023f14b40d1f15f962

Fix T67889: Object Importer Error.

Clamp input values to avoid invalid ones.

===================================================================

M	io_scene_obj/__init__.py
M	io_scene_obj/import_obj.py

===================================================================

diff --git a/io_scene_obj/__init__.py b/io_scene_obj/__init__.py
index 611c95c4..b129f283 100644
--- a/io_scene_obj/__init__.py
+++ b/io_scene_obj/__init__.py
@@ -21,7 +21,7 @@
 bl_info = {
     "name": "Wavefront OBJ format",
     "author": "Campbell Barton, Bastien Montagne",
-    "version": (3, 5, 11),
+    "version": (3, 5, 12),
     "blender": (2, 80, 0),
     "location": "File > Import-Export",
     "description": "Import-Export OBJ, Import OBJ mesh, UV's, materials and textures",
diff --git a/io_scene_obj/import_obj.py b/io_scene_obj/import_obj.py
index f03ed2f1..c8a09b2a 100644
--- a/io_scene_obj/import_obj.py
+++ b/io_scene_obj/import_obj.py
@@ -357,7 +357,8 @@ def create_materials(filepath, relpath,
                     elif line_id == b'ns':
                         # XXX Totally empirical conversion, trying to adapt it
                         #     (from 0.0 - 900.0 OBJ specular exponent range to 1.0 - 0.0 Principled BSDF range)...
-                        context_mat_wrap.roughness = 1.0 - (sqrt(float_func(line_split[1])) / 30)
+                        val = max(0.0, min(900.0, float_func(line_split[1])))
+                        context_mat_wrap.roughness = 1.0 - (sqrt(val) / 30)
                         context_material_vars.add("roughness")
                     elif line_id == b'ni':  # Refraction index (between 0.001 and 10).
                         context_mat_wrap.ior = float_func(line_split[1])