Lindie viewer-dev catchup regarding rendering pipeline.

indra/llcommon/llstrider.h

@@ -50,6 +50,16 @@ public:
 
 	const LLStrider<Object>& operator =  (Object *first)    { mObjectp = first; return *this;}
 	void setStride (S32 skipBytes)	{ mSkip = (skipBytes ? skipBytes : sizeof(Object));}
+	
+	LLStrider<Object> operator+(const S32& index) 
+	{
+		LLStrider<Object> ret;
+		ret.mBytep = mBytep + mSkip*index;
+		ret.mSkip = mSkip;
+
+		return ret;
+	}
+	
 	//void setTypeSize (S32 typeBytes){ mTypeSize = (typeBytes ? typeBytes : sizeof(Object)); }
 
 	//bool isStrided() const		   { return mTypeSize != mSkip; }