star-3d

commit 33e91495fd3f5db1d379b5944a6b90be0c4b15dd
parent b97c95bbfbb089052a2e3ac65083d49fcf1528ef
Author: Vincent Forest <vincent.forest@meso-star.com>
Date:   Tue, 16 Jun 2015 15:44:20 +0200

Fix the hit normal attribute

The flip_surface flag of the intersected shapes was not taken into
account to fill the hit normal.

Diffstat:
M
src/s3d_scene.c
 | 
6
++++++

1 file changed, 6 insertions(+), 0 deletions(-)
diff --git a/src/s3d_scene.c b/src/s3d_scene.c
@@ -628,6 +628,7 @@ s3d_scene_trace_ray
     *hit = S3D_HIT_NULL;
   } else {
     float w;
+    char flip_surface = 0;
     f3_set(hit->normal, ray.Ng);
     hit->distance = ray.tfar;
 
@@ -652,6 +653,7 @@ s3d_scene_trace_ray
       hit->prim.mesh__ = darray_mesh_data_get(&scn->meshes)[ray.geomID];
       hit->prim.inst__ = NULL;
       hit->prim.iprim__ = ray.primID;
+
     } else { /* The hit shape is instantiated */
       /* Retrieve the hit instance */
       struct instance* instance;
@@ -660,7 +662,11 @@ s3d_scene_trace_ray
       hit->prim.mesh__ = scene_get_mesh(instance->scene, ray.geomID);
       hit->prim.inst__ = instance;
       hit->prim.iprim__ = ray.primID;
+      flip_surface = instance->flip_surface;
     }
+    flip_surface ^= ((struct mesh*)hit->prim.mesh__)->flip_surface;
+    if(flip_surface)
+      f3_minus(hit->normal, hit->normal);
   }
   return RES_OK;
 }