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-rw-r--r--indra/newview/app_settings/shaders/class1/deferred/deferredUtil.glsl11
1 files changed, 7 insertions, 4 deletions
diff --git a/indra/newview/app_settings/shaders/class1/deferred/deferredUtil.glsl b/indra/newview/app_settings/shaders/class1/deferred/deferredUtil.glsl
index ab0e4fd4d8..3319e32cdf 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/deferredUtil.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/deferredUtil.glsl
@@ -99,10 +99,13 @@ void calcHalfVectors(vec3 lv, vec3 n, vec3 v,
{
l = normalize(lv);
h = normalize(l + v);
- nh = clamp(dot(n, h), 0.0, 1.0);
- nl = clamp(dot(n, l), 0.0, 1.0);
- nv = clamp(dot(n, v), 0.0, 1.0);
- vh = clamp(dot(v, h), 0.0, 1.0);
+
+ // lower bound to avoid divide by zero
+ float eps = 0.000001;
+ nh = clamp(dot(n, h), eps, 1.0);
+ nl = clamp(dot(n, l), eps, 1.0);
+ nv = clamp(dot(n, v), eps, 1.0);
+ vh = clamp(dot(v, h), eps, 1.0);
lightDist = length(lv);
}