diff options
Diffstat (limited to 'source/blender/editors/space_view3d/view3d_view.c')
| -rw-r--r-- | source/blender/editors/space_view3d/view3d_view.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/source/blender/editors/space_view3d/view3d_view.c b/source/blender/editors/space_view3d/view3d_view.c index 12654bdac14..77833ceb5c5 100644 --- a/source/blender/editors/space_view3d/view3d_view.c +++ b/source/blender/editors/space_view3d/view3d_view.c @@ -481,6 +481,45 @@ void VIEW3D_OT_setobjectascamera(wmOperatorType *ot) } /* ********************************** */ +void view3d_calculate_clipping(BoundBox *bb, float planes[4][4], bglMats *mats, rcti *rect) +{ + double xs, ys, p[3]; + short val; + + /* near zero floating point values can give issues with gluUnProject + in side view on some implementations */ + if(fabs(mats->modelview[0]) < 1e-6) mats->modelview[0]= 0.0; + if(fabs(mats->modelview[5]) < 1e-6) mats->modelview[5]= 0.0; + + /* Set up viewport so that gluUnProject will give correct values */ + mats->viewport[0] = 0; + mats->viewport[1] = 0; + + /* four clipping planes and bounding volume */ + /* first do the bounding volume */ + for(val=0; val<4; val++) { + xs= (val==0||val==3)?rect->xmin:rect->xmax; + ys= (val==0||val==1)?rect->ymin:rect->ymax; + + gluUnProject(xs, ys, 0.0, mats->modelview, mats->projection, mats->viewport, &p[0], &p[1], &p[2]); + VECCOPY(bb->vec[val], p); + + gluUnProject(xs, ys, 1.0, mats->modelview, mats->projection, mats->viewport, &p[0], &p[1], &p[2]); + VECCOPY(bb->vec[4+val], p); + } + + /* then plane equations */ + for(val=0; val<4; val++) { + + CalcNormFloat(bb->vec[val], bb->vec[val==3?0:val+1], bb->vec[val+4], + planes[val]); + + planes[val][3]= - planes[val][0]*bb->vec[val][0] + - planes[val][1]*bb->vec[val][1] + - planes[val][2]*bb->vec[val][2]; + } +} + /* create intersection coordinates in view Z direction at mouse coordinates */ void viewline(ARegion *ar, View3D *v3d, float mval[2], float ray_start[3], float ray_end[3]) { |