 #define FLOATDATA
 //#define CONSTLOAD
 #define THREADPERVOXEL
+#define CONSTDATA
 
 const int Repetitions = 1;
+
+#ifdef CONSTDATA
+#undef SHMLOAD
+#endif
 
 #ifdef CONSTLOAD
 #undef NOLOAD

            const int vidx = ix - iPosX;
            const int iidx = ix;
#endif
#ifdef SHMCLASS
            const uchar4 v = *(voxel + BPV * vidx);
            const float4 c = make_float4(v.x/255.f, v.y/255.f, v.z/255.f, v.w/255.f);
            uchar4 *pix = imgLine + iidx;
#else
            // fetch scalar voxel value
#ifdef SHMLOAD

#else
            const Scalar *v = voxLine + BPV * vidx;
#endif
            // apply transfer function
#ifdef FLOATDATA
            const float4 c = tex1Dfetch(tex_tf, *v*255.f);
#else
            const float4 c = tex1Dfetch(tex_tf, *v);
#endif
#endif
#endif
            // pointer to destination pixel
            uchar4 *pix = imgLine + iidx;
            uchar4 d = *pix;

            // blend
