[Bf-blender-cvs] SVN commit: /data/svn/bf-blender [36013] trunk/blender/source/blender/ editors: utility function for getting the vector direction the mouse is pointing in a perspective view .

[Campbell Barton]

Revision: 36013
          http://projects.blender.org/scm/viewvc.php?view=rev&root=bf-blender&revision=36013
Author:   campbellbarton
Date:     2011-04-05 02:58:19 +0000 (Tue, 05 Apr 2011)
Log Message:
-----------
utility function for getting the vector direction the mouse is pointing in a perspective view.

Modified Paths:
--------------
    trunk/blender/source/blender/editors/include/ED_view3d.h
    trunk/blender/source/blender/editors/space_view3d/view3d_view.c

Modified: trunk/blender/source/blender/editors/include/ED_view3d.h
===================================================================
--- trunk/blender/source/blender/editors/include/ED_view3d.h	2011-04-04 22:42:43 UTC (rev 36012)
+++ trunk/blender/source/blender/editors/include/ED_view3d.h	2011-04-05 02:58:19 UTC (rev 36013)
@@ -82,6 +82,7 @@
 int initgrabz(struct RegionView3D *rv3d, float x, float y, float z);
 void window_to_3d(struct ARegion *ar, float *vec, short mx, short my);
 void window_to_3d_delta(struct ARegion *ar, float *vec, short mx, short my);
+void window_to_3d_vector(struct ARegion *ar, float *vec, short mx, short my);
 void view3d_unproject(struct bglMats *mats, float out[3], const short x, const short y, const float z);
 
 /* Depth buffer */

Modified: trunk/blender/source/blender/editors/space_view3d/view3d_view.c
===================================================================
--- trunk/blender/source/blender/editors/space_view3d/view3d_view.c	2011-04-04 22:42:43 UTC (rev 36012)
+++ trunk/blender/source/blender/editors/space_view3d/view3d_view.c	2011-04-05 02:58:19 UTC (rev 36013)
@@ -677,6 +677,28 @@
 	vec[2]= (rv3d->persinv[0][2]*dx + rv3d->persinv[1][2]*dy);
 }
 
+/* doesn't rely on initgrabz */
+/* for perspective view, get the vector direction to
+ * the mouse cursor as a normalized vector */
+void window_to_3d_vector(ARegion *ar, float *vec, short mx, short my)
+{
+	RegionView3D *rv3d= ar->regiondata;
+	float dx, dy;
+	float viewvec[3];
+
+	dx= 2.0f*mx/ar->winx;
+	dy= 2.0f*my/ar->winy;
+
+	/* normalize here so vecs are proportional to eachother */
+	normalize_v3_v3(viewvec, rv3d->viewinv[2]);
+
+	vec[0]= viewvec[0] - (rv3d->persinv[0][0]*dx + rv3d->persinv[1][0]*dy);
+	vec[1]= viewvec[1] - (rv3d->persinv[0][1]*dx + rv3d->persinv[1][1]*dy);
+	vec[2]= viewvec[2] - (rv3d->persinv[0][2]*dx + rv3d->persinv[1][2]*dy);
+
+	normalize_v3(vec);
+}
+
 float read_cached_depth(ViewContext *vc, int x, int y)
 {
 	ViewDepths *vd = vc->rv3d->depths;