Add the dmnsn_interior* to dmnsn_intersection*.

3 files changed, 14 insertions, 11 deletions

diff --git a/libdimension/cube.c b/libdimension/cube.c
index da7f206..9815eb6 100644
--- a/libdimension/cube.c
+++ b/libdimension/cube.c
@@ -124,10 +124,11 @@ dmnsn_cube_intersection_fn(const dmnsn_object *cube, dmnsn_line line)
 
   if (t >= 0.0) {
     intersection = dmnsn_new_intersection();
-    intersection->ray     = line;
-    intersection->t       = t;
-    intersection->normal  = normal;
-    intersection->texture = cube->texture;
+    intersection->ray      = line;
+    intersection->t        = t;
+    intersection->normal   = normal;
+    intersection->texture  = cube->texture;
+    intersection->interior = cube->interior;
   }
 
   return intersection;
diff --git a/libdimension/dimension/object.h b/libdimension/dimension/object.h
index 4c1980d..e607d8c 100644
--- a/libdimension/dimension/object.h
+++ b/libdimension/dimension/object.h
@@ -26,7 +26,7 @@
 #define DIMENSION_OBJECT_H
 
 /* A type to represent a ray-object intersection */
-typedef struct {
+typedef struct dmnsn_intersection {
   /* The ray and point which intersected */
   dmnsn_line ray;
   double t;
@@ -34,8 +34,9 @@ typedef struct {
   /* The surface normal at the intersection point */
   dmnsn_vector normal;
 
-  /* The texture at the intersection point */
-  const dmnsn_texture *texture;
+  /* The object properties at the intersection point */
+  const dmnsn_texture  *texture;
+  const dmnsn_interior *interior;
 } dmnsn_intersection;
 
 /* Intersection allocation cannot fail */
diff --git a/libdimension/sphere.c b/libdimension/sphere.c
index c238192..d994248 100644
--- a/libdimension/sphere.c
+++ b/libdimension/sphere.c
@@ -69,10 +69,11 @@ dmnsn_sphere_intersection_fn(const dmnsn_object *sphere, dmnsn_line line)
 
     if (t >= 0.0) {
       intersection = dmnsn_new_intersection();
-      intersection->ray     = line;
-      intersection->t       = t;
-      intersection->normal  = dmnsn_line_point(line, t);
-      intersection->texture = sphere->texture;
+      intersection->ray      = line;
+      intersection->t        = t;
+      intersection->normal   = dmnsn_line_point(line, t);
+      intersection->texture  = sphere->texture;
+      intersection->interior = sphere->interior;
 
       /* Flip the normal if we're inside the sphere */
       if (dmnsn_vector_dot(line.n, intersection->normal) > 0.0)