Enable vertex snapping to bundle positions

This means it's possible now to snap stuff to
reconstructed tracks positions.

source/blender/blenkernel/BKE_object.h

@@ -170,7 +170,7 @@ int BKE_object_is_deform_modified(struct Scene *scene, struct Object *ob);
 
 void BKE_object_relink(struct Object *ob);
 
-struct MovieClip *BKE_object_movieclip_get(struct Scene *scene, struct Object *ob, int use_default);
+struct MovieClip *BKE_object_movieclip_get(struct Scene *scene, struct Object *ob, bool use_default);
 
 /* this function returns a superset of the scenes selection based on relationships */
 

source/blender/blenkernel/intern/depsgraph.c

@@ -2275,7 +2275,7 @@ static void dag_id_flush_update(Main *bmain, Scene *sce, ID *id)
 		 * so it should happen tracking-related constraints recalculation
 		 * when camera is changing (sergey) */
 		if (sce->camera && &sce->camera->id == id) {
-			MovieClip *clip = BKE_object_movieclip_get(sce, sce->camera, 1);
+			MovieClip *clip = BKE_object_movieclip_get(sce, sce->camera, true);
 
 			if (clip)
 				dag_id_flush_update(bmain, sce, &clip->id);

source/blender/blenkernel/intern/object.c

@@ -3261,7 +3261,7 @@ void BKE_object_relink(Object *ob)
 	ID_NEW(ob->proxy_group);
 }
 
-MovieClip *BKE_object_movieclip_get(Scene *scene, Object *ob, int use_default)
+MovieClip *BKE_object_movieclip_get(Scene *scene, Object *ob, bool use_default)
 {
 	MovieClip *clip = use_default ? scene->clip : NULL;
 	bConstraint *con = ob->constraints.first, *scon = NULL;

source/blender/editors/object/object_transform.c

@@ -551,7 +551,7 @@ static int apply_objects_internal(bContext *C, ReportList *reports, int apply_lo
 			}
 		}
 		else if (ob->type == OB_CAMERA) {
-			MovieClip *clip = BKE_object_movieclip_get(scene, ob, FALSE);
+			MovieClip *clip = BKE_object_movieclip_get(scene, ob, false);
 
 			/* applying scale on camera actually scales clip's reconstruction.
 			 * of there's clip assigned to camera nothing to do actually.

source/blender/editors/space_clip/tracking_ops.c

@@ -1874,13 +1874,13 @@ static Object *get_camera_with_movieclip(Scene *scene, MovieClip *clip)
 	Object *camera = scene->camera;
 	Base *base;
 
-	if (camera && BKE_object_movieclip_get(scene, camera, 0) == clip)
+	if (camera && BKE_object_movieclip_get(scene, camera, false) == clip)
 		return camera;
 
 	base = scene->base.first;
 	while (base) {
 		if (base->object->type == OB_CAMERA) {
-			if (BKE_object_movieclip_get(scene, base->object, 0) == clip) {
+			if (BKE_object_movieclip_get(scene, base->object, false) == clip) {
 				camera = base->object;
 				break;
 			}

source/blender/editors/space_view3d/drawobject.c

@@ -1672,7 +1672,7 @@ static void drawcamera(Scene *scene, View3D *v3d, RegionView3D *rv3d, Base *base
 	int i;
 	float drawsize;
 	const bool is_view = (rv3d->persp == RV3D_CAMOB && ob == v3d->camera);
-	MovieClip *clip = BKE_object_movieclip_get(scene, base->object, 0);
+	MovieClip *clip = BKE_object_movieclip_get(scene, base->object, false);
 
 	/* draw data for movie clip set as active for scene */
 	if (clip) {

source/blender/editors/space_view3d/view3d_draw.c

@@ -1662,7 +1662,7 @@ static void view3d_draw_bgpic(Scene *scene, ARegion *ar, View3D *v3d,
 
 				if (bgpic->flag & V3D_BGPIC_CAMERACLIP) {
 					if (scene->camera)
-						clip = BKE_object_movieclip_get(scene, scene->camera, 1);
+						clip = BKE_object_movieclip_get(scene, scene->camera, true);
 				}
 				else {
 					clip = bgpic->clip;

source/blender/editors/space_view3d/view3d_select.c

@@ -1462,7 +1462,7 @@ static bool mouse_select(bContext *C, const int mval[2], bool extend, bool desel
 							/* index of bundle is 1<<16-based. if there's no "bone" index
 							 * in height word, this buffer value belongs to camera. not to bundle */
 							if (buffer[4 * i + 3] & 0xFFFF0000) {
-								MovieClip *clip = BKE_object_movieclip_get(scene, basact->object, 0);
+								MovieClip *clip = BKE_object_movieclip_get(scene, basact->object, false);
 								MovieTracking *tracking = &clip->tracking;
 								ListBase *tracksbase;
 								MovieTrackingTrack *track;

source/blender/editors/space_view3d/view3d_snap.c

@@ -882,7 +882,7 @@ void VIEW3D_OT_snap_cursor_to_grid(wmOperatorType *ot)
 
 static void bundle_midpoint(Scene *scene, Object *ob, float vec[3])
 {
-	MovieClip *clip = BKE_object_movieclip_get(scene, ob, 0);
+	MovieClip *clip = BKE_object_movieclip_get(scene, ob, false);
 	MovieTracking *tracking;
 	MovieTrackingObject *object;
 	int ok = 0;

source/blender/editors/transform/transform_snap.c

@@ -59,6 +59,7 @@
 #include "BKE_context.h"
 #include "BKE_editmesh.h"
 #include "BKE_mesh.h"
+#include "BKE_tracking.h"
 
 #include "RNA_access.h"
 
@@ -1557,6 +1558,90 @@ static bool snapEmpty(short snap_mode, ARegion *ar, Object *ob, float obmat[4][4
 	return retval;
 }
 
+static bool snapCamera(short snap_mode, ARegion *ar, Scene *scene, Object *object, float obmat[4][4],
+                       const float ray_start[3], const float ray_normal[3], const float mval[2],
+                       float r_loc[3], float *UNUSED(r_no), float *r_dist_px, float *r_depth)
+{
+	float orig_camera_mat[4][4], orig_camera_imat[4][4], imat[4][4];
+	bool retval = false;
+	MovieClip *clip = BKE_object_movieclip_get(scene, object, false);
+	MovieTracking *tracking;
+	float ray_start_local[3], ray_normal_local[3];
+
+	if (clip == NULL) {
+		return retval;
+	}
+	if (object->transflag & OB_DUPLI) {
+		return retval;
+	}
+
+	tracking = &clip->tracking;
+
+	BKE_tracking_get_camera_object_matrix(scene, object, orig_camera_mat);
+
+	invert_m4_m4(orig_camera_imat, orig_camera_mat);
+	invert_m4_m4(imat, obmat);
+
+	switch (snap_mode) {
+		case SCE_SNAP_MODE_VERTEX:
+		{
+			MovieTrackingObject *tracking_object;
+
+			for (tracking_object = tracking->objects.first;
+			     tracking_object;
+			     tracking_object = tracking_object->next)
+			{
+				ListBase *tracksbase = BKE_tracking_object_get_tracks(tracking, tracking_object);
+				MovieTrackingTrack *track;
+				float reconstructed_camera_mat[4][4],
+				      reconstructed_camera_imat[4][4];
+				float (*vertex_obmat)[4];
+
+				copy_v3_v3(ray_start_local, ray_start);
+				copy_v3_v3(ray_normal_local, ray_normal);
+
+				if ((tracking_object->flag & TRACKING_OBJECT_CAMERA) == 0) {
+					BKE_tracking_camera_get_reconstructed_interpolate(tracking, tracking_object,
+					                                                  CFRA, reconstructed_camera_mat);
+
+					invert_m4_m4(reconstructed_camera_imat, reconstructed_camera_mat);
+				}
+
+				for (track = tracksbase->first; track; track = track->next) {
+					float bundle_pos[3];
+
+					if ((track->flag & TRACK_HAS_BUNDLE) == 0) {
+						continue;
+					}
+
+					copy_v3_v3(bundle_pos, track->bundle_pos);
+					if (tracking_object->flag & TRACKING_OBJECT_CAMERA) {
+						mul_m4_v3(orig_camera_imat, ray_start_local);
+						mul_mat3_m4_v3(orig_camera_imat, ray_normal_local);
+						vertex_obmat = orig_camera_mat;
+					}
+					else {
+						mul_m4_v3(reconstructed_camera_imat, bundle_pos);
+						mul_m4_v3(imat, ray_start_local);
+						mul_mat3_m4_v3(imat, ray_normal_local);
+						vertex_obmat = obmat;
+					}
+
+					retval |= snapVertex(ar, bundle_pos, NULL, vertex_obmat, NULL,
+					                     ray_start, ray_start_local, ray_normal_local, mval,
+					                     r_loc, NULL, r_dist_px, r_depth);
+				}
+			}
+
+			break;
+		}
+		default:
+			break;
+	}
+
+	return retval;
+}
+
 static bool snapObject(Scene *scene, short snap_mode, ARegion *ar, Object *ob, float obmat[4][4], bool use_obedit,
                        Object **r_ob, float r_obmat[4][4],
                        const float ray_start[3], const float ray_normal[3], const float mval[2],
@@ -1586,6 +1671,8 @@ static bool snapObject(Scene *scene, short snap_mode, ARegion *ar, Object *ob, f
 	}
 	else if (ob->type == OB_EMPTY) {
 		retval = snapEmpty(snap_mode, ar, ob, obmat, ray_start, ray_normal, mval, r_loc, r_no, r_dist_px, r_depth);
+	} else if (ob->type == OB_CAMERA) {
+		retval = snapCamera(snap_mode, ar, scene, ob, obmat, ray_start, ray_normal, mval, r_loc, r_no, r_dist_px, r_depth);
 	}
 	
 	if (retval) {