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author | Karl Berry <karl@freefriends.org> | 2013-05-18 21:58:51 +0000 |
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committer | Karl Berry <karl@freefriends.org> | 2013-05-18 21:58:51 +0000 |
commit | 1b4cb2401e932a47c4e736a0197d22c7797b58ad (patch) | |
tree | 8e478eee9868a06467931e053ec06658ae3a8e06 /Build/source/utils/asymptote/base/three_surface.asy | |
parent | 93dcab8a877f998aafe2bef5e59b7c6ea2f7f434 (diff) |
asy 2.22 sources
git-svn-id: svn://tug.org/texlive/trunk@30552 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Build/source/utils/asymptote/base/three_surface.asy')
-rw-r--r-- | Build/source/utils/asymptote/base/three_surface.asy | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/Build/source/utils/asymptote/base/three_surface.asy b/Build/source/utils/asymptote/base/three_surface.asy index 0ef497f6d56..85d32b08eb6 100644 --- a/Build/source/utils/asymptote/base/three_surface.asy +++ b/Build/source/utils/asymptote/base/three_surface.asy @@ -321,9 +321,12 @@ patch operator * (transform3 t, patch s) Si[j]=t*si[j]; } - transform3 t0=shiftless(t); - for(int i=0; i < s.normals.length; ++i) - S.normals[i]=t0*s.normals[i]; + if(s.normals.length > 0) { + transform3 t0=shiftless(t); + t0=determinant(t0) == 0 ? identity4 : transpose(inverse(t0)); + for(int i=0; i < s.normals.length; ++i) + S.normals[i]=t0*s.normals[i]; + } S.colors=copy(s.colors); S.planar=s.planar; |