Ignore alpha modifier for particle materials

This makes the tx_ash_flake.dds particles from ashcloud.nif appear.

components/nifogre/material.cpp

@@ -106,7 +106,7 @@ Ogre::String NIFMaterialLoader::getMaterial(const Nif::ShapeData *shapedata,
                                             const Nif::NiZBufferProperty *zprop,
                                             const Nif::NiSpecularProperty *specprop,
                                             const Nif::NiWireframeProperty *wireprop,
-                                            bool &needTangents, bool disableLighting)
+                                            bool &needTangents, bool particleMaterial)
 {
     Ogre::MaterialManager &matMgr = Ogre::MaterialManager::getSingleton();
     Ogre::MaterialPtr material = matMgr.getByName(name);
@@ -245,8 +245,10 @@ Ogre::String NIFMaterialLoader::getMaterial(const Nif::ShapeData *shapedata,
         }
     }
 
-    if (disableLighting)
+    if (particleMaterial)
     {
+        alpha = 1.f; // Apparently ignored, might be overridden by particle vertex colors?
+
         ambient = Ogre::Vector3(0.f);
         diffuse = Ogre::Vector3(0.f);
         specular = Ogre::Vector3(0.f);

components/nifogre/material.hpp

@@ -49,7 +49,7 @@ public:
                                     const Nif::NiZBufferProperty *zprop,
                                     const Nif::NiSpecularProperty *specprop,
                                     const Nif::NiWireframeProperty *wireprop,
-                                    bool &needTangents, bool disableLighting=false);
+                                    bool &needTangents, bool particleMaterial=false);
 };
 
 }