fix transparency problem if dissolve value set to 0;

package version to 1.0.1

src/Obj23dTiles/Obj23dTiles.csproj

@@ -12,6 +12,7 @@
     <RepositoryUrl>https://github.com/arcplus/ObjConvert</RepositoryUrl>
     <Copyright>Copyright © Arcplus 2018</Copyright>
     <Description>Convert wavefront obj file to 3d tiles, which can be used in cesium</Description>
+    <Version>1.0.1</Version>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(TargetFramework)'=='net45'">

src/Obj2Gltf/Converter.cs

@@ -437,10 +437,10 @@ private Gltf.Material GetDefault()
             {
                 AlphaMode = AlphaMode.OPAQUE,
                 Name = "default",
-                EmissiveFactor = new double[] { 1, 1, 1 },
+                //EmissiveFactor = new double[] { 1, 1, 1 },
                 PbrMetallicRoughness = new PbrMetallicRoughness
                 {
-                    BaseColorFactor = new double[] { 1, 1, 1, 1 },
+                    BaseColorFactor = new double[] { 0.5, 0.5, 0.5, 1 },
                     MetallicFactor = 0.0,
                     RoughnessFactor = 0.0
                 }
@@ -462,7 +462,7 @@ private int AddMaterial(WaveFront.Material mat)
                     AlphaMode = AlphaMode.OPAQUE
                 };
                 var alpha = 1.0;
-                if (mat.Dissolve != null)
+                if (mat.Dissolve != null && mat.Dissolve.Factor > 0)
                 {
                     gMat.AlphaMode = AlphaMode.BLEND;
                     alpha = mat.Dissolve.Factor;

src/Obj2Gltf/Gltf/Material.cs

@@ -43,7 +43,7 @@ public class Material
         /// The emissive color of the material.
         /// </summary>
         [JsonProperty("emissiveFactor")]
-        public double[] EmissiveFactor = new double[] { 0, 0, 0 };
+        public double[] EmissiveFactor { get; set; } // = new double[] { 0, 0, 0 };
         /// <summary>
         /// The alpha rendering mode of the material.
         ///
@@ -105,6 +105,6 @@ public class PbrMetallicRoughness
         /// * A value of 1.0 means the material is completely rough.
         /// * A value of 0.0 means the material is completely smooth.
         [JsonProperty("roughnessFactor")]
-        public double RoughnessFactor { get; set; }
+        public double RoughnessFactor { get; set; } = 0.9;
     }
 }

src/Obj2Gltf/Obj2Gltf.csproj

@@ -13,6 +13,7 @@
     <RepositoryUrl>https://github.com/arcplus/ObjConvert</RepositoryUrl>
     <Copyright>Copyright © Arcplus 2018</Copyright>
     <Description>Convert wavefront obj file to gltf/glb file</Description>
+    <Version>1.0.1</Version>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(TargetFramework)'=='net45'">

src/Obj2Gltf/WaveFront/MtlParser.cs

@@ -166,5 +166,17 @@ public void Dispose()
                 _reader.Close();                
             }
         }
+        /// <summary>
+        /// Translate the blinn-phong model to the pbr metallic-roughness model
+        /// Roughness factor is a combination of specular intensity and shininess
+        /// Metallic factor is 0.0
+        /// Textures are not converted for now
+        /// </summary>
+        /// <param name="color"></param>
+        /// <returns></returns>
+        public static double Luminance(Color color)
+        {
+            return color.Red * 0.2125 + color.Green * 0.7154 + color.Blue * 0.0721;
+        }
     }
 }