take into account the center of the aabb when calculating side planes

diff --git a/src/geom.cc b/src/geom.cc
index 1813eea..a96066f 100644 (file)
--- a/src/geom.cc
+++ b/src/geom.cc
@@ -147,19 +147,20 @@ Vec3 AABox::get_corner(int idx) const
 
 Plane AABox::get_plane(int pidx) const
 {
+       Vec3 c = (max - min) * 0.5f;
        switch(pidx) {
        case AABOX_PLANE_PX:
-               return Plane(Vec3(max.x, 0, 0), Vec3(1, 0, 0));
+               return Plane(Vec3(max.x, c.y, c.z), Vec3(1, 0, 0));
        case AABOX_PLANE_NX:
-               return Plane(Vec3(min.x, 0, 0), Vec3(-1, 0, 0));
+               return Plane(Vec3(min.x, c.y, c.z), Vec3(-1, 0, 0));
        case AABOX_PLANE_PY:
-               return Plane(Vec3(0, max.x, 0), Vec3(0, 1, 0));
+               return Plane(Vec3(c.x, max.x, c.z), Vec3(0, 1, 0));
        case AABOX_PLANE_NY:
-               return Plane(Vec3(0, min.x, 0), Vec3(0, -1, 0));
+               return Plane(Vec3(c.x, min.x, c.z), Vec3(0, -1, 0));
        case AABOX_PLANE_PZ:
-               return Plane(Vec3(0, 0, max.z), Vec3(0, 0, 1));
+               return Plane(Vec3(c.x, c.y, max.z), Vec3(0, 0, 1));
        case AABOX_PLANE_NZ:
-               return Plane(Vec3(0, 0, min.z), Vec3(0, 0, -1));
+               return Plane(Vec3(c.x, c.y, min.z), Vec3(0, 0, -1));
        default:
                break;
        }