diff options
Diffstat (limited to 'source/blender/editors/space_view3d/view3d_utils.c')
-rw-r--r-- | source/blender/editors/space_view3d/view3d_utils.c | 44 |
1 files changed, 41 insertions, 3 deletions
diff --git a/source/blender/editors/space_view3d/view3d_utils.c b/source/blender/editors/space_view3d/view3d_utils.c index bb8c1a40a05..7f930f1d876 100644 --- a/source/blender/editors/space_view3d/view3d_utils.c +++ b/source/blender/editors/space_view3d/view3d_utils.c @@ -1212,9 +1212,17 @@ float ED_view3d_radius_to_dist(const View3D *v3d, /** \name View Distance Utilities * \{ */ -/* problem - ofs[3] can be on same location as camera itself. - * Blender needs proper dist value for zoom. - * use fallback_dist to override small values +/** + * This function solves the problem of having to switch between camera and non-camera views. + * + * When viewing from the perspective of \a mat, and having the view center \a ofs, + * this calculates a distance from \a ofs to the matrix \a mat. + * Using \a fallback_dist when the distance would be too small. + * + * \param mat: A matrix use for the view-point (typically the camera objects matrix). + * \param ofs: Orbit center (negated), matching #RegionView3D.ofs, which is typically passed in. + * \param fallback_dist: The distance to use if the object is too near or in front of \a ofs. + * \returns A newly calculated distance or the fallback. */ float ED_view3d_offset_distance(float mat[4][4], const float ofs[3], const float fallback_dist) { @@ -1261,6 +1269,36 @@ void ED_view3d_distance_set(RegionView3D *rv3d, const float dist) rv3d->dist = dist; } +/** + * Change the distance & offset to match the depth of \a dist_co along the view axis. + * + * \param dist_co: A world-space location to use for the new depth. + * \param dist_min: Resulting distances below this will be ignored. + * \return Success if the distance was set. + */ +bool ED_view3d_distance_set_from_location(RegionView3D *rv3d, + const float dist_co[3], + const float dist_min) +{ + float viewinv[4]; + invert_qt_qt_normalized(viewinv, rv3d->viewquat); + + float tvec[3] = {0.0f, 0.0f, -1.0f}; + mul_qt_v3(viewinv, tvec); + + float dist_co_local[3]; + negate_v3_v3(dist_co_local, rv3d->ofs); + sub_v3_v3v3(dist_co_local, dist_co, dist_co_local); + const float delta = dot_v3v3(tvec, dist_co_local); + const float dist_new = rv3d->dist + delta; + if (dist_new >= dist_min) { + madd_v3_v3fl(rv3d->ofs, tvec, -delta); + rv3d->dist = dist_new; + return true; + } + return false; +} + /** \} */ /* -------------------------------------------------------------------- */ |