diff options
author | Brecht Van Lommel <brechtvanlommel@pandora.be> | 2010-01-05 17:26:38 +0300 |
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committer | Brecht Van Lommel <brechtvanlommel@pandora.be> | 2010-01-05 17:26:38 +0300 |
commit | d16547ab73e7086d5358bba67093173827d12afe (patch) | |
tree | cdcc994222129063aaf916f972f8ed3311675266 /source/blender/blenlib/intern/math_geom.c | |
parent | 01b762e8463ec6192d43b3bfac7d29b0c24757c0 (diff) |
Alt+B view clipping is now taken into account properly for sculpt, particle
edit and snapping, by clipping the view ray.
Diffstat (limited to 'source/blender/blenlib/intern/math_geom.c')
-rw-r--r-- | source/blender/blenlib/intern/math_geom.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/source/blender/blenlib/intern/math_geom.c b/source/blender/blenlib/intern/math_geom.c index 2b94227099c..a80f999cdbb 100644 --- a/source/blender/blenlib/intern/math_geom.c +++ b/source/blender/blenlib/intern/math_geom.c @@ -1246,6 +1246,55 @@ int isect_point_tri_prism_v3(float p[3], float v1[3], float v2[3], float v3[3]) return 1; } +int clip_line_plane(float p1[3], float p2[3], float plane[4]) +{ + float dp[3], n[3], div, t, pc[3]; + + copy_v3_v3(n, plane); + sub_v3_v3v3(dp, p2, p1); + div= dot_v3v3(dp, n); + + if(div == 0.0f) /* parallel */ + return 1; + + t= -(dot_v3v3(p1, n) + plane[3])/div; + + if(div > 0.0f) { + /* behind plane, completely clipped */ + if(t >= 1.0f) { + zero_v3(p1); + zero_v3(p2); + return 0; + } + + /* intersect plane */ + if(t > 0.0f) { + madd_v3_v3v3fl(pc, p1, dp, t); + copy_v3_v3(p1, pc); + return 1; + } + + return 1; + } + else { + /* behind plane, completely clipped */ + if(t <= 0.0f) { + zero_v3(p1); + zero_v3(p2); + return 0; + } + + /* intersect plane */ + if(t < 1.0f) { + madd_v3_v3v3fl(pc, p1, dp, t); + copy_v3_v3(p2, pc); + return 1; + } + + return 1; + } +} + /****************************** Interpolation ********************************/ static float tri_signed_area(float *v1, float *v2, float *v3, int i, int j) |