59 void rt_polycylinder(void *tex, vector *points, int numpts, apiflt rad) {  in rt_polycylinder()
83 void rt_heightfield(void *tex, vector ctr, int m, int n, apiflt *field, apiflt wx, apiflt wy) {  in rt_heightfield()
86     apiflt xoff, yoff, zoff;  in rt_heightfield()
126 rt_sheightfield(void *tex, vector ctr, int m, int n, apiflt *field, apiflt wx, apiflt wy) {  in rt_sheightfield()
130     apiflt xinc, yinc;  in rt_sheightfield()
140     xinc = wx / ((apiflt)m);  in rt_sheightfield()
141     yinc = wy / ((apiflt)n);  in rt_sheightfield()
197 static void adjust(apiflt *base,  in adjust()
200                    apiflt wx,  in adjust()
201                    apiflt wy,  in adjust()
208     apiflt d, v;  in adjust()
225 subdivide(apiflt *base, int xres, int yres, apiflt wx, apiflt wy, int x1, int y1, int x2, int y2) {  in subdivide()
252 void rt_landscape(void *tex, int m, int n, vector ctr, apiflt wx, apiflt wy) {  in rt_landscape()
254     apiflt *field;  in rt_landscape()
260     field = (apiflt *)malloc(totalsize * sizeof(apiflt));  in rt_landscape()