128     vector *normals;  in rt_sheightfield()  local
134     normals = (vector *)malloc(m * n * sizeof(vector));  in rt_sheightfield()
154         normals[x] = normals[(n - 1) * m + x] = rt_vector(0.0, 1.0, 0.0);  in rt_sheightfield()
157         normals[y * m] = normals[y * m + (m - 1)] = rt_vector(0.0, 1.0, 0.0);  in rt_sheightfield()
163             normals[addr] = rt_vector(-(field[addr + 1] - field[addr - 1]) / (2.0 * xinc),  in rt_sheightfield()
167             MyVNorm(&normals[addr]);  in rt_sheightfield()
180                     normals[addr],  in rt_sheightfield()
181                     normals[addr + 1 + m],  in rt_sheightfield()
182                     normals[addr + 1]);  in rt_sheightfield()
187                     normals[addr],  in rt_sheightfield()
188                     normals[addr + m],  in rt_sheightfield()
189                     normals[addr + 1 + m]);  in rt_sheightfield()
193     free(normals);  in rt_sheightfield()