float lon = relbbox(0,@P).z;
float hei = relbbox(0,@P).y;
float thi = relbbox(0,@P).x;;
float minu = ch("minu"), maxu = ch("maxu"), minv = ch("minv"), maxv = ch("maxv");
float uOffset = ch("uOffset"), vOffset = ch("vOffset");
float fitu = fit01(lon,minu,maxu) + uOffset;
float fitv = fit01(hei,minv,maxv) + vOffset;
vector customUv = set(fitu,fitv,0);
vector uvPos = uvsample(1,"P","uv",customUv);
vector uvN = uvsample(1,"N","uv",customUv);
vector uvColor = uvsample(1,"Cd","uv", customUv);
v@P = uvPos;
v@P += uvN*thi*ch("thickness");
v@Cd = uvColor;