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utility function for getting the vector direction the mouse is pointing in a perspective view.

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Campbell Barton 2011-04-05 02:58:19 +00:00
parent 162d02bf50
commit db6ea4d3a5
2 changed files with 23 additions and 0 deletions
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1
source/blender/editors/include/ED_view3d.h
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@ -82,6 +82,7 @@ float *give_cursor(struct Scene *scene, struct View3D *v3d);
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 */

22
source/blender/editors/space_view3d/view3d_view.c
View File

@ -677,6 +677,28 @@ void window_to_3d_delta(ARegion *ar, float *vec, short mx, short my)
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;