Better tooltip for exposure weight on emission fields. (#1821)

* Better tooltip

* Changelog

Co-authored-by: sebastienlagarde <sebastien@unity3d.com>

Author: FrancescoC-unity

com.unity.render-pipelines.high-definition/Editor/Material/UIBlocks/DecalSurfaceInputsUIBlock.cs

@@ -35,7 +35,7 @@ public class Styles
             public static GUIContent useEmissionIntensityText = new GUIContent("Use Emission Intensity", "When enabled, this Material separates emission color and intensity. This makes the Emission Map into an LDR color and exposes the Emission Intensity property.");
             public static GUIContent emissionMapText = new GUIContent("Emission Map", "Specifies a map (RGB) that the Material uses for emission.");
             public static GUIContent emissiveIntensityText = new GUIContent("Emission Intensity", "Sets the overall strength of the emission effect.");
-            public static GUIContent emissiveExposureWeightText = new GUIContent("Exposure weight", "Control the percentage of emission to expose.");
+            public static GUIContent emissiveExposureWeightText = new GUIContent("Exposure weight", "Controls how the camera exposure influences the perceived intensity of the emissivity. A weight of 0 means that the emissive intensity is calculated ignoring the exposure; increasing this weight progressively increases the influence of exposure on the final emissive value.");
             public static GUIContent decalLayerText = new GUIContent("Decal Layer", "Specifies the current Decal Layers that the Decal affects.This Decal affect corresponding Material with the same Decal Layer flags.");
             public static GUIContent maskMapText = new GUIContent("Mask Map", "Specifies the Mask Map for this Material - Metal(R), Ambient Occlusion(G), Opacity(B), Smoothness(A)");
         }

com.unity.render-pipelines.high-definition/Editor/Material/UIBlocks/EmissionUIBlock.cs

@@ -41,7 +41,7 @@ public class Styles
             public static GUIContent useEmissiveIntensityText = new GUIContent("Use Emission Intensity", "Specifies whether to use to a HDR color or a LDR color with a separate multiplier.");
             public static GUIContent emissiveIntensityText = new GUIContent("Emission Intensity", "");
             public static GUIContent emissiveIntensityFromHDRColorText = new GUIContent("The emission intensity is from the HDR color picker in luminance", "");
-            public static GUIContent emissiveExposureWeightText = new GUIContent("Exposure weight", "Control the percentage of emission to expose.");
+            public static GUIContent emissiveExposureWeightText = new GUIContent("Exposure weight", "Controls how the camera exposure influences the perceived intensity of the emissivity. A weight of 0 means that the emissive intensity is calculated ignoring the exposure; increasing this weight progressively increases the influence of exposure on the final emissive value.");
 
             public static GUIContent UVEmissiveMappingText = new GUIContent("Emission UV mapping", "");
             public static GUIContent texWorldScaleText = new GUIContent("World Scale", "Sets the tiling factor HDRP applies to Planar/Trilinear mapping.");