Use new gluFrustum6 to do a better job of coming up with the projection.

1 files changed, 6 insertions, 3 deletions

diff --git a/shadow_map.c b/shadow_map.c
index a0df0ee..79e3fd4 100644
--- a/shadow_map.c
+++ b/shadow_map.c
@@ -80,9 +80,12 @@ calculate_light_projection(void)
 		    &light_world,
 		    &ring_bounding_sphere_center_world,
 		    &light_up);
-	gluPerspective4(&temp, 120, /*XXX: calculate me */
-			       1.0, /* we're using a bounding sphere, w == h */
-			       0.2, 40);
+	gluFrustum6(&temp,
+		    -ring_bounding_sphere_radius, ring_bounding_sphere_radius,
+		    -ring_bounding_sphere_radius, ring_bounding_sphere_radius,
+		    light_distance_to_rings - ring_bounding_sphere_radius,
+		    light_distance_to_rings + ring_bounding_sphere_radius);
+	print_GLUmat4("frustum", &temp);
 	gluMult4m_4m(&world_to_light_ndc, &temp, &world_to_light_eye);
 }