73                 a.y = points[i].y - points[i - 1].y;  in rt_polycylinder()
90     zoff = ctr.y;  in rt_heightfield()
95             v0.y = field[(yy)*m + (xx)] + zoff;  in rt_heightfield()
99             v1.y = field[(yy)*m + (xx + 1)] + zoff;  in rt_heightfield()
103             v2.y = field[(yy + 1) * m + (xx + 1)] + zoff;  in rt_heightfield()
109             v0.y = field[(yy)*m + (xx)] + zoff;  in rt_heightfield()
113             v1.y = field[(yy + 1) * m + (xx)] + zoff;  in rt_heightfield()
117             v2.y = field[(yy + 1) * m + (xx + 1)] + zoff;  in rt_heightfield()
131     int x, y, addr;  in rt_sheightfield()  local
137     offset.y = ctr.z - (wy / 2.0);  in rt_sheightfield()
138     offset.z = ctr.y;  in rt_sheightfield()
144     for (y = 0; y < n; y++) {  in rt_sheightfield()
146             addr = y * m + x;  in rt_sheightfield()
148                 rt_vector(x * xinc + offset.x, field[addr] + offset.z, y * yinc + offset.y);  in rt_sheightfield()
156     for (y = 1; y < n; y++) {  in rt_sheightfield()
157         normals[y * m] = normals[y * m + (m - 1)] = rt_vector(0.0, 1.0, 0.0);  in rt_sheightfield()
159     for (y = 1; y < (n - 1); y++) {  in rt_sheightfield()
161             addr = y * m + x;  in rt_sheightfield()
172     for (y = 0; y < (n - 1); y++) {  in rt_sheightfield()
174             addr = y * m + x;  in rt_sheightfield()
205                    int y,  in adjust()  argument
210     if (base[x + (xres * y)] == 0.0) {  in adjust()
220         base[x + (xres * y)] = v;  in adjust()
226     long x, y;  in subdivide()  local
233     y = (y1 + y2) / 2;  in subdivide()
236     adjust(base, xres, yres, wx, wy, x2, y1, x2, y, x2, y2);  in subdivide()
238     adjust(base, xres, yres, wx, wy, x1, y1, x1, y, x1, y2);  in subdivide()
240     if (base[x + xres * y] == 0.0) {  in subdivide()
241         base[x + (xres * y)] = (base[x1 + xres * y1] + base[x2 + xres * y1] + base[x2 + xres * y2] +  in subdivide()
246     subdivide(base, xres, yres, wx, wy, x1, y1, x, y);  in subdivide()
247     subdivide(base, xres, yres, wx, wy, x, y1, x2, y);  in subdivide()
248     subdivide(base, xres, yres, wx, wy, x, y, x2, y2);  in subdivide()
249     subdivide(base, xres, yres, wx, wy, x1, y, x, y2);  in subdivide()
253     int totalsize, x, y;  in rt_landscape()  local
262     for (y = 0; y < n; y++) {  in rt_landscape()
264             field[x + y * m] = 0.0;  in rt_landscape()