83 void rt_heightfield(void *tex, vector ctr, int m, int n, apiflt *field, apiflt wx, apiflt wy) {  in rt_heightfield()  argument
92     for (yy = 0; yy < (n - 1); yy++) {  in rt_heightfield()
96             v0.z = wy * (yy) / (n * 1.0) + yoff;  in rt_heightfield()
100             v1.z = wy * (yy) / (n * 1.0) + yoff;  in rt_heightfield()
104             v2.z = wy * (yy + 1) / (n * 1.0) + yoff;  in rt_heightfield()
110             v0.z = wy * (yy) / (n * 1.0) + yoff;  in rt_heightfield()
114             v1.z = wy * (yy + 1) / (n * 1.0) + yoff;  in rt_heightfield()
118             v2.z = wy * (yy + 1) / (n * 1.0) + yoff;  in rt_heightfield()
126 rt_sheightfield(void *tex, vector ctr, int m, int n, apiflt *field, apiflt wx, apiflt wy) {  in rt_sheightfield()  argument
133     vertices = (vector *)malloc(m * n * sizeof(vector));  in rt_sheightfield()
134     normals = (vector *)malloc(m * n * sizeof(vector));  in rt_sheightfield()
141     yinc = wy / ((apiflt)n);  in rt_sheightfield()
144     for (y = 0; y < n; y++) {  in rt_sheightfield()
154         normals[x] = normals[(n - 1) * m + x] = rt_vector(0.0, 1.0, 0.0);  in rt_sheightfield()
156     for (y = 1; y < n; y++) {  in rt_sheightfield()
159     for (y = 1; y < (n - 1); y++) {  in rt_sheightfield()
172     for (y = 0; y < (n - 1); y++) {  in rt_sheightfield()
252 void rt_landscape(void *tex, int m, int n, vector ctr, apiflt wx, apiflt wy) {  in rt_landscape()  argument
256     totalsize = m * n;  in rt_landscape()
262     for (y = 0; y < n; y++) {  in rt_landscape()
270     field[0 + m * (n - 1)] = 1.0 + (rand() % 100) / 100.0;  in rt_landscape()
271     field[m - 1 + m * (n - 1)] = 1.0 + (rand() % 100) / 100.0;  in rt_landscape()
273     subdivide(field, m, n, wx, wy, 0, 0, m - 1, n - 1);  in rt_landscape()
275     rt_sheightfield(tex, ctr, m, n, field, wx, wy);  in rt_landscape()