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-rw-r--r--progs/demos/ipers.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/progs/demos/ipers.c b/progs/demos/ipers.c
index d38c4d1ae88..029de000898 100644
--- a/progs/demos/ipers.c
+++ b/progs/demos/ipers.c
@@ -205,6 +205,13 @@ calcposobs(void)
dir[1] = cos(alpha * M_PI / 180.0) * sin(beta * M_PI / 180.0);
dir[2] = cos(beta * M_PI / 180.0);
+ if (dir[0] < 1.0e-5 && dir[0] > -1.0e-5)
+ dir[0] = 0;
+ if (dir[1] < 1.0e-5 && dir[1] > -1.0e-5)
+ dir[1] = 0;
+ if (dir[2] < 1.0e-5 && dir[2] > -1.0e-5)
+ dir[2] = 0;
+
obs[0] += v * dir[0];
obs[1] += v * dir[1];
obs[2] += v * dir[2];