From 470407ec3bac11ae5a5c6174a6e9630caa1a42f7 Mon Sep 17 00:00:00 2001 From: Campbell Barton Date: Thu, 20 Sep 2018 11:21:34 +1000 Subject: 3D View: point-on-plane from screen location utility --- .../blender/editors/space_view3d/view3d_project.c | 25 ++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'source/blender/editors/space_view3d/view3d_project.c') diff --git a/source/blender/editors/space_view3d/view3d_project.c b/source/blender/editors/space_view3d/view3d_project.c index 767df04c0b0..d5b6c60563f 100644 --- a/source/blender/editors/space_view3d/view3d_project.c +++ b/source/blender/editors/space_view3d/view3d_project.c @@ -537,6 +537,31 @@ void ED_view3d_win_to_3d_int( ED_view3d_win_to_3d(v3d, ar, depth_pt, mval_fl, r_out); } +bool ED_view3d_win_to_3d_on_plane( + const ARegion *ar, + const float plane[4], const float mval[2], + float r_out[3]) +{ + float ray_co[3], ray_no[3]; + ED_view3d_win_to_origin(ar, mval, ray_co); + ED_view3d_win_to_vector(ar, mval, ray_no); + float lambda; + if (isect_ray_plane_v3(ray_co, ray_no, plane, &lambda, false)) { + madd_v3_v3v3fl(r_out, ray_co, ray_no, lambda); + return true; + } + return false; +} + +bool ED_view3d_win_to_3d_on_plane_int( + const ARegion *ar, + const float plane[4], const int mval[2], + float r_out[3]) +{ + const float mval_fl[2] = {mval[0], mval[1]}; + return ED_view3d_win_to_3d_on_plane(ar, plane, mval_fl, r_out); +} + /** * Calculate a 3d difference vector from 2d window offset. * note that ED_view3d_calc_zfac() must be called first to determine -- cgit v1.2.3