Transform Volume rewrite/refactor

Take advantage of the efficiency provided by the snap_context.

Also fixes errors:
- volume snap fails based on view angle (T48394).
- multiple instances of dupli-objects break volume calculation.

1 files changed, 34 insertions, 1 deletions

diff --git a/source/blender/editors/include/ED_transform_snap_object_context.h b/source/blender/editors/include/ED_transform_snap_object_context.h
index e591a91a90f..900b7593f2e 100644
--- a/source/blender/editors/include/ED_transform_snap_object_context.h
+++ b/source/blender/editors/include/ED_transform_snap_object_context.h
@@ -29,6 +29,7 @@ struct BMVert;
 struct BMEdge;
 struct BMFace;
 
+struct ListBase;
 struct Scene;
 struct Main;
 struct Object;
@@ -38,6 +39,24 @@ struct View3D;
 /* transform_snap_object.c */
 
 /* ED_transform_snap_object_*** API */
+
+/** used for storing multiple hits */
+struct SnapObjectHitDepth {
+	struct SnapObjectHitDepth *next, *prev;
+
+	float depth;
+	float co[3];
+	float no[3];
+	int index;
+
+	struct Object *ob;
+	float obmat[4][4];
+
+	/* needed to tell which ray-cast this was part of,
+	 * the same object may be part of many ray-casts when dupli's are used. */
+	unsigned int ob_uuid;
+};
+
 struct SnapObjectParams {
 	int snap_select;  /* SnapSelect */
 	union {
@@ -81,9 +100,16 @@ bool ED_transform_snap_object_project_ray_ex(
         struct Object **r_ob, float r_obmat[4][4]);
 bool ED_transform_snap_object_project_ray(
         SnapObjectContext *sctx,
-        const float ray_origin[3], const float ray_direction[3], float *ray_dist,
+        const float ray_origin[3], const float ray_direction[3], float *ray_depth,
         float r_co[3], float r_no[3]);
 
+bool ED_transform_snap_object_project_ray_all(
+        SnapObjectContext *sctx,
+        const struct SnapObjectParams *params,
+        const float ray_start[3], const float ray_normal[3],
+        float ray_depth, bool sort,
+        struct ListBase *r_hit_list);
+
 bool ED_transform_snap_object_project_view3d_ex(
         struct SnapObjectContext *sctx,
         const struct SnapObjectParams *params,
@@ -104,4 +130,11 @@ bool ED_transform_snap_object_project_view3d_mixed(
         bool use_depth,
         float r_co[3], float r_no[3]);
 
+bool ED_transform_snap_object_project_all_view3d_ex(
+        SnapObjectContext *sctx,
+        const struct SnapObjectParams *params,
+        const float mval[2],
+        float ray_depth, bool sort,
+        ListBase *r_hit_list);
+
 #endif  /* __ED_TRANSFORM_SNAP_OBJECT_CONTEXT_H__ */