Why.

src/gen.c

@@ -1,6 +1,7 @@
 #include "include/gen.h"
 #include "include/geom.h"
 
+#include <raylib.h>
 #include <stddef.h>
 #include <stdlib.h>
 #include <time.h>
@@ -106,22 +107,28 @@ void gen_lith() {
     Pt* plhulls[NPLATES];          // The convex hulls of each plate.
     size_t plhulls_count[NPLATES]; // The number of points in each hull.
 
-    for (int i = 0; i < NPLATES; i++) {
+    for (int i = 0; i < NPLATES; i++) { // Generate convex hulls.
         size_t count;
         plhulls[i] = cvx_hull(plareas[i], plareas_count[i], &count);
         plhulls_count[i] = count;
     }
 
-    Plate pls[NPLATES];
+    Plate pls[NPLATES]; // The plates.
 
-    for (int i = 0; i < NPLATES; i++) {
+    for (int i = 0; i < NPLATES;
+         i++) { // Generate plate triangle lists from convex hulls.
         Tri* tris = malloc(plhulls_count[i] / 3 + 2);
         tris[0] = (Tri){plhulls[i][0], plhulls[i][1], plhulls[i][2]};
+        for (int j = 2; j < plhulls_count[i] - 2; j++) {
+            tris[j] =
+                (Tri){plhulls[i][0], plhulls[i][j + 1], plhulls[i][j + 2]};
+        }
+
+        pls[i] = (Plate){.ntris = 1,
+                         .tris = tris,
+                         .col = ColorFromHSV(((float)rand()) / 100, 1, 1)};
     }
 
-    Tri* tri1 = tri_init((Pt){0, 0}, (Pt){0, 7}, (Pt){7, 0});
+    lith[0] = pls[0];
-    Tri* tri2 = tri_init((Pt){7, 0}, (Pt){0, 7}, (Pt){7, 7});
+    lith[1] = pls[1];
-
-    lith[0] = (Plate){.col = BLUE, .ntris = 1, .tris = tri1};
-    lith[1] = (Plate){.col = GREEN, .ntris = 1, .tris = tri2};
 }