added some comments

1 files changed, 7 insertions, 4 deletions

diff --git a/src/fracture.h b/src/fracture.h
index 349e59e..a9973ea 100644
--- a/src/fracture.h
+++ b/src/fracture.h
@@ -37,14 +37,17 @@ typedef enum bound_t {
 } bound_t;
 
 typedef struct {
-	uint_t ne;
-	uint_t nv;
-	uint_t dnv;
+	uint_t ne;          // number of edges
+	uint_t nv;          // number of vertices
+	uint_t dnv;         // number of dual vertices
 	uint_t nv_break;
 	uint_t num_bounds;
-	uint_t *ev;
+	// 2*ne length array.  edge i connects vertices ev[2*i], ev[2*i+1] < nv
+	uint_t *ev; 
 	uint_t *ev_break;
+	// nv+1 length array.  vertex i has degree vei[i+1]-vei[i], vei[0] = 0
 	uint_t *vei;
+	// vei[nv] length array.  vertex i is connected to edges ve[vei[i]+j], 0 <= j < vei[i+1]-vei[i]
 	uint_t *ve;
 	uint_t *bound_inds;
 	uint_t *bound_verts;