Clamp probes compression factor to 0 (#19)

com.unity.render-pipelines.high-definition/CHANGELOG.md

@@ -37,6 +37,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed an issue where unncessarily serialized members in StaticLightingSky component would change each time the scene is changed.
 - Fix issues in the post process system with RenderTexture being invalid in some cases, causing rendering problems.
 - Fixed an issue where changing the default volume profile from another inspector would not update the default volume editor.
+- Fix for range compression factor for probes going negative (now clamped to positive values).
 
 ### Changed
 - Rejecting history for ray traced reflections based on a threshold evaluated on the neighborhood of the sampled history.

com.unity.render-pipelines.high-definition/Runtime/Utilities/ProbeSettings.cs

@@ -137,6 +137,7 @@ public struct Lighting
             public float fadeDistance;
             /// <summary>The result of the rendering of the probe will be divided by this factor. When the probe is read, this factor is undone as the probe data is read.
             /// This is to simply avoid issues with values clamping due to precision of the storing format.</summary>
+            [Min(1e-6f)]
             public float rangeCompressionFactor;
         }