Fixed OBJ reader not reading materials which start with a leading space

src/OpenMesh/Core/IO/reader/OBJReader.cc

@@ -188,17 +188,18 @@ read_material(std::fstream& _in)
 
     stream >> keyWrd;
 
-    if( ( isspace(line[0]) && line[0] != '\t' ) || line[0] == '#' )
+    if (keyWrd == "newmtl") // begin new material definition
     {
+      // If we are in a material definition (Already reading a material)
+      // And a material name has been set
+      // And the current material definition is valid
+      // Then Store the current material in our lookup table 
       if (indef && !key.empty() && mat.is_valid())
       {
         materials_[key] = mat;
         mat.cleanup();
       }
-    }
 
-    else if (keyWrd == "newmtl") // begin new material definition
-    {
       stream >> key;
       indef = true;
     }

src/Unittests/TestFiles/CubeCol.mtl

@@ -0,0 +1,9 @@
+newmtl cube
+Ns 10.0000
+Ni 1.000
+d 1.0000
+illum 2
+#Ambient, Diffuse, Specular colors
+ Ka 1.0000 0.7000 0.1000
+ Kd 0.1250 0.2500 0.5000
+ Ks 1.0000 0.6000 0.4000

src/Unittests/TestFiles/CubeCol.obj

@@ -0,0 +1,28 @@
+# cube.obj
+#
+o cube
+mtllib CubeCol.mtl
+
+v -0.500000 -0.500000 0.500000
+v 0.500000 -0.500000 0.500000
+v -0.500000 0.500000 0.500000
+v 0.500000 0.500000 0.500000
+v -0.500000 0.500000 -0.500000
+v 0.500000 0.500000 -0.500000
+v -0.500000 -0.500000 -0.500000
+v 0.500000 -0.500000 -0.500000
+
+g cube
+usemtl cube
+f 1 2 3
+f 3 2 4
+f 3 4 5
+f 5 4 6
+f 5 6 7
+f 7 6 8
+f 7 8 1
+f 1 8 2
+f 2 8 4
+f 4 8 6
+f 7 1 5
+f 5 1 3

src/Unittests/unittests_read_write_OBJ.cc

@@ -623,7 +623,48 @@ TEST_F(OpenMeshReadWriteOBJ, FaceTexCoordTest) {
 }
 
 
+/*
+ * Load, save and load a simple obj
+ */
+TEST_F(OpenMeshReadWriteOBJ, ReadOBJMTL) {
 
+  mesh_.clear();
+  mesh_.request_face_colors();
+
+  OpenMesh::IO::Options options;
+  options += OpenMesh::IO::Options::FaceColor;
+  bool ok = OpenMesh::IO::read_mesh(mesh_, "CubeCol.obj", options);
+
+  EXPECT_TRUE(ok) << "Unable to load CubeCol.obj";
+
+  OpenMesh::FaceHandle fh0 = mesh_.face_handle(0);
+  OpenMesh::FaceHandle fh1 = mesh_.face_handle(1);
+  OpenMesh::FaceHandle fh2 = mesh_.face_handle(2);
+  OpenMesh::FaceHandle fh3 = mesh_.face_handle(3);
+
+
+  EXPECT_TRUE(fh0.is_valid()) << "fh0 should be valid";
+  EXPECT_TRUE(fh1.is_valid()) << "fh1 should be valid";
+  EXPECT_TRUE(fh2.is_valid()) << "fh2 should be valid";
+  EXPECT_TRUE(fh3.is_valid()) << "fh3 should be valid";
+
+  EXPECT_FLOAT_EQ(32,    mesh_.color(fh0)[0] ) << "Wrong vertex color at face 0 component 0";
+  EXPECT_FLOAT_EQ(64 ,   mesh_.color(fh0)[1] ) << "Wrong vertex color at face 0 component 1";
+  EXPECT_FLOAT_EQ(128,   mesh_.color(fh0)[2] ) << "Wrong vertex color at face 0 component 2";
+
+  EXPECT_FLOAT_EQ(32,    mesh_.color(fh1)[0] ) << "Wrong vertex color at face 1 component 0";
+  EXPECT_FLOAT_EQ(64,    mesh_.color(fh1)[1] ) << "Wrong vertex color at face 1 component 1";
+  EXPECT_FLOAT_EQ(128,   mesh_.color(fh1)[2] ) << "Wrong vertex color at face 1 component 2";
+
+  EXPECT_FLOAT_EQ(32,    mesh_.color(fh2)[0] ) << "Wrong vertex color at face 2 component 0";
+  EXPECT_FLOAT_EQ(64,    mesh_.color(fh2)[1] ) << "Wrong vertex color at face 2 component 1";
+  EXPECT_FLOAT_EQ(128,   mesh_.color(fh2)[2] ) << "Wrong vertex color at face 2 component 2";
+
+  EXPECT_FLOAT_EQ(32,    mesh_.color(fh3)[0] ) << "Wrong vertex color at face 3 component 0";
+  EXPECT_FLOAT_EQ(64,    mesh_.color(fh3)[1] ) << "Wrong vertex color at face 3 component 1";
+  EXPECT_FLOAT_EQ(128,   mesh_.color(fh3)[2] ) << "Wrong vertex color at face 3 component 2";
+
+}