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-rw-r--r--Build/source/utils/asymptote/drawsurface.cc7
1 files changed, 7 insertions, 0 deletions
diff --git a/Build/source/utils/asymptote/drawsurface.cc b/Build/source/utils/asymptote/drawsurface.cc
index 5576023c9f1..98383fc83be 100644
--- a/Build/source/utils/asymptote/drawsurface.cc
+++ b/Build/source/utils/asymptote/drawsurface.cc
@@ -599,6 +599,13 @@ void drawSphere::P(Triple& t, double x, double y, double z)
double temp=z; z=x; x=-temp;
}
+ if(T == NULL) {
+ t[0]=x;
+ t[1]=y;
+ t[2]=z;
+ return;
+ }
+
double f=T[12]*x+T[13]*y+T[14]*z+T[15];
if(f == 0.0) run::dividebyzero();
f=1.0/f;