* Tried to fix NVIDIA shininess==0 bug (again!)

* MTL loader now properly follows spec regarding initial values of colors
 * TangentBinormalGenerator now throws proper exception on missing normals

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@7730 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/nbproject/project.properties

@@ -78,7 +78,7 @@ jnlp.signed=true
 jnlp.signing=generated
 jnlp.signing.alias=
 jnlp.signing.keystore=
-main.class=jme3test.export.TestOgreConvert
+main.class=testcases.ObjImport
 manifest.file=MANIFEST.MF
 meta.inf.dir=${src.dir}/META-INF
 mkdist.disabled=false

engine/src/core-data/Common/MatDefs/Light/Lighting.frag

@@ -101,7 +101,9 @@ float lightComputeSpecular(in vec3 norm, in vec3 viewdir, in vec3 lightdir, in f
 vec2 computeLighting(in vec3 wvPos, in vec3 wvNorm, in vec3 wvViewDir, in vec3 wvLightDir){
    float diffuseFactor = lightComputeDiffuse(wvNorm, wvLightDir, wvViewDir);
    float specularFactor = lightComputeSpecular(wvNorm, wvViewDir, wvLightDir, m_Shininess);
-   specularFactor *= step(1.0, m_Shininess);
+
+   // if shininess is == 0, spec == 0, if shininess > 1, spec == 1
+   specularFactor *= min(1.0, m_Shininess); 
 
    #ifdef HQ_ATTENUATION
     float att = clamp(1.0 - g_LightPosition.w * length(lightVec), 0.0, 1.0);

engine/src/core-plugins/com/jme3/scene/plugins/MTLLoader.java

@@ -92,8 +92,8 @@ public class MTLLoader implements AssetLoader {
     }
     
     protected void resetMaterial(){
-        ambient.set(ColorRGBA.Black);
-        diffuse.set(ColorRGBA.Black);
+        ambient.set(ColorRGBA.DarkGray);
+        diffuse.set(ColorRGBA.LightGray);
         specular.set(ColorRGBA.Black);
         shininess = 16;
         shadeless = false;
@@ -189,6 +189,9 @@ public class MTLLoader implements AssetLoader {
             specular.set(readColor());
         }else if (cmd.equals("ns")){
             shininess = scan.nextFloat(); /* (128f / 1000f)*/
+            if (specular.equals(ColorRGBA.Black)){
+                specular.set(ColorRGBA.White);
+            }
         }else if (cmd.equals("d") || cmd.equals("tr")){
             alpha = scan.nextFloat();
             transparent = true;

engine/src/core/com/jme3/util/TangentBinormalGenerator.java

@@ -166,6 +166,10 @@ public class TangentBinormalGenerator {
             t[i] = new Vector2f();
         }
         
+        if (mesh.getBuffer(Type.Normal) == null){
+            throw new IllegalArgumentException("The given mesh has no normal data!");
+        }
+
         VertexData[] vertices;
         switch (mesh.getMode()) {
             case Triangles: