SMaterial::isTransparent now nearly back to how it looked like once.

Otherwise materials like EMT_TRANSPARENT_ALPHA_CHANNEL no longer worked.
Not sure if this is now causing other problems, but it no longer seems to break the known cases (tests about that pass again). If there are new problems we need new tests to show 'em.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@5086 dfc29bdd-3216-0410-991c-e03cc46cb475

include/SMaterial.h

@@ -730,7 +730,11 @@ namespace video
 
 		bool isTransparent() const
 		{
-			bool status = false;
+			if ( MaterialType==EMT_TRANSPARENT_ADD_COLOR ||
+				MaterialType==EMT_TRANSPARENT_ALPHA_CHANNEL ||
+				MaterialType==EMT_TRANSPARENT_VERTEX_ALPHA ||
+				MaterialType==EMT_TRANSPARENT_REFLECTION_2_LAYER )
+				return true;
 
 			if (BlendOperation != EBO_NONE && BlendFactor != 0.f)
 			{
@@ -746,12 +750,13 @@ namespace video
 				if (textureBlendFunc_hasAlpha(srcRGBFact) || textureBlendFunc_hasAlpha(dstRGBFact) ||
 					textureBlendFunc_hasAlpha(srcAlphaFact) || textureBlendFunc_hasAlpha(dstAlphaFact))
 				{
-					status = true;
+					return true;
 				} 
 			}
 
-			return status;
+			return false;
 		}
+
 	};
 
 	//! global const identity Material