Disable volumetrics

ScriptableRenderPipeline/HDRenderPipeline/ShaderConfig.cs

     public enum ShaderOptions
     {
         CameraRelativeRendering  = 1, // Rendering sets the origin of the world to the position of the primary (scene view) camera
-        VolumetricLightingPreset = 1  // 0 = disabled, 1 = normal, 2 = ultra
+        VolumetricLightingPreset = 0  // 0 = disabled, 1 = normal, 2 = ultra
     };
 
     // Note: #define can't be use in include file in C# so we chose this way to configure both C# and hlsl

ScriptableRenderPipeline/HDRenderPipeline/ShaderConfig.cs.hlsl

 // UnityEngine.Experimental.Rendering.HDPipeline.ShaderOptions:  static fields
 //
 #define SHADEROPTIONS_CAMERA_RELATIVE_RENDERING (1)
-#define SHADEROPTIONS_VOLUMETRIC_LIGHTING_PRESET (1)
+#define SHADEROPTIONS_VOLUMETRIC_LIGHTING_PRESET (0)
 
 
 #endif