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-rw-r--r--data/diffraction.cl2
1 files changed, 1 insertions, 1 deletions
diff --git a/data/diffraction.cl b/data/diffraction.cl
index 8b6ece99..4262a1ec 100644
--- a/data/diffraction.cl
+++ b/data/diffraction.cl
@@ -74,7 +74,7 @@ float4 get_q(int x, int y, float cx, float cy, float res, float clen, float k,
q = (float4)(k*native_sin(tt)*native_cos(az),
k*native_sin(tt)*native_sin(az),
- k-k*native_cos(tt), 0.0);
+ k*(native_cos(tt)-1.0), 0.0);
return quat_rot(q, z);
}