cppS = cppJ + [0,-1] * catch_len;
cppD = [ cppA[0], cppS[1] + catch_slop ];
cppC = [ cppB[0], cppD[1] ];
cppS = cppJ + [0,-1] * catch_len;
cppD = [ cppA[0], cppS[1] + catch_slop ];
cppC = [ cppB[0], cppD[1] ];
cppU = cppT + [0,-1] * catch_height;
cppV = [ cppS[0], cppU[1] - catch_depth ];
cppU = cppT + [0,-1] * catch_height;
cppV = [ cppS[0], cppU[1] - catch_depth ];