polyadvent

commit 35865d59734ee3d1d36b12d20aef92da41497319
parent 22d643338dc8db1a5e1f85d91b34cbf2dc78f462
Author: William Casarin <jb55@jb55.com>
Date:   Sat,  3 Nov 2018 23:04:22 -0700

calculate bounding boxes for geometry

Diffstat:
M
src/geometry.h
 | 
2
++
M
src/ply.c
 | 
11
+++++++++++

2 files changed, 13 insertions(+), 0 deletions(-)
diff --git a/src/geometry.h b/src/geometry.h
@@ -16,6 +16,8 @@ struct buffer_geometry {
 
 struct geometry {
     struct buffer_geometry vbos;
+    float min[3];
+    float max[3];
     int num_indices;
     int num_verts;
     float *vertices;
diff --git a/src/ply.c b/src/ply.c
@@ -6,6 +6,7 @@
 #include "file.h"
 #include "common.h"
 #include "ply.h"
+#include "vec3.h"
 
 /* void parse_vertex( */
 
@@ -159,6 +160,16 @@ int parse_ply(const char *filename, struct geometry *geom) {
                 break;
             }
 
+            // compute bounding box as we go
+            if (cvert == 0) {
+                vec3_copy(vert, geom->min);
+                vec3_copy(vert, geom->max);
+            }
+            else {
+                vec3_min(vert, geom->min, geom->min);
+                vec3_max(vert, geom->max, geom->max);
+            }
+
             geom->vertices[cvert * 3]     = vert[0];
             geom->vertices[cvert * 3 + 1] = vert[1];
             geom->vertices[cvert * 3 + 2] = vert[2];