Minimum Brightness support.

Author: ShingenPizza

CGIncludes/PlusStuff.cginc

@@ -17,6 +17,8 @@ float _VRC_Visible_Mirror_Camera;
 float _VRC_Visible_Mirror_VRCLens;
 float _VRC_Visible_Mirror_Screenshot;
 
+float _LightingMinLightBrightness;
+
 
 void check_visibility()
 {

CGIncludes/UnityStandardCore Plus.cginc

@@ -466,6 +466,12 @@ half4 fragForwardBaseInternal (VertexOutputForwardBase i)
     UnityGI gi = FragmentGI (s, occlusion, i.ambientOrLightmapUV, atten, mainLight);
 
     half4 c = UNITY_BRDF_PBS (s.diffColor, s.specColor, s.oneMinusReflectivity, s.smoothness, s.normalWorld, -s.eyeVec, gi.light, gi.indirect);
+
+#ifndef _ALPHAPREMULTIPLY_ON
+    // Plus - Minimum Brightness
+    c.rgb = max(c.rgb / s.diffColor, _LightingMinLightBrightness) * s.diffColor;
+#endif
+
     c.rgb += Emission(i.tex.xy);
 
     #ifdef _SPECULARS_ON
@@ -702,6 +708,11 @@ void fragDeferred (
 
     half3 emissiveColor = UNITY_BRDF_PBS (s.diffColor, s.specColor, s.oneMinusReflectivity, s.smoothness, s.normalWorld, -s.eyeVec, gi.light, gi.indirect).rgb;
 
+#ifndef _ALPHAPREMULTIPLY_ON
+    // Plus - Minimum Brightness
+    emissiveColor.rgb = max(emissiveColor.rgb / s.diffColor, _LightingMinLightBrightness) * s.diffColor;
+#endif
+
     #ifdef _EMISSION
         emissiveColor += Emission (i.tex.xy);
     #endif

CGIncludes/UnityStandardCoreForwardSimple Plus.cginc

@@ -228,6 +228,12 @@ half4 fragForwardBaseSimpleInternal (VertexOutputBaseSimple i)
 
     half3 c = BRDF3_Indirect(s.diffColor, s.specColor, gi.indirect, PerVertexGrazingTerm(i, s), PerVertexFresnelTerm(i));
     c += BRDF3DirectSimple(s.diffColor, s.specColor, s.smoothness, rl) * attenuatedLightColor;
+
+#ifndef _ALPHAPREMULTIPLY_ON
+    // Plus - Minimum Brightness
+    c.rgb = max(c.rgb / s.diffColor, _LightingMinLightBrightness) * s.diffColor;
+#endif
+
     c += Emission(i.tex.xy);
 
     #ifdef _SPECULARS_ON

DefaultResourcesExtra/Standard Plus.shader

@@ -52,6 +52,9 @@ Shader "ShingenPizza/Standard Plus"
         [ToggleOff] _VRC_Visible_Mirror_VRCLens("Visible In Mirrors To VRCLens", Float) = 1.0
         [ToggleOff] _VRC_Visible_Mirror_Screenshot("Visible In Mirrors On Screenshots", Float) = 1.0
 
+		// Plus - Minimum Brightness
+        _LightingMinLightBrightness("Minimum Brightness", Range(0.0, 1.0)) = 0.0
+
 		// Plus - Culling
         [HideInInspector] _Cull("__cull", Float) = 2.0
 

DefaultResourcesExtra/StandardSpecular Plus.shader

@@ -52,6 +52,9 @@ Shader "ShingenPizza/Standard (Specular setup) Plus"
         [ToggleOff] _VRC_Visible_Mirror_VRCLens("Visible In Mirrors To VRCLens", Float) = 1.0
         [ToggleOff] _VRC_Visible_Mirror_Screenshot("Visible In Mirrors On Screenshots", Float) = 1.0
 
+		// Plus - Minimum Brightness
+        _LightingMinLightBrightness("Minimum Brightness", Range(0.0, 1.0)) = 0.0
+
 		// Plus - Culling
         [HideInInspector] _Cull("__cull", Float) = 2.0
 

Editor/ShaderGUI Plus.cs

@@ -26,6 +26,8 @@ private static class Styles
         MaterialProperty light_volumes_speculars;
         MaterialProperty light_volumes_dominant_speculars;
 
+        protected MaterialProperty min_brightness;
+
         protected MaterialProperty cullMode;
 
         protected MaterialEditor m_MaterialEditor;
@@ -34,6 +36,7 @@ protected void FindPropertiesPlus(MaterialProperty[] props)
         {
             FindPropertiesPlusVisibility(props);
             FindPropertiesPlusLightVolumes(props);
+            FindPropertiesPlusMinBrightness(props);
             FindPropertiesPlusCull(props);
         }
 
@@ -57,11 +60,16 @@ protected void FindPropertiesPlusLightVolumes(MaterialProperty[] props)
             light_volumes_dominant_speculars = FindProperty("_DominantDirSpeculars", props);
         }
 
+        public void FindPropertiesPlusMinBrightness(MaterialProperty[] props)
+        {
+            min_brightness = FindProperty("_LightingMinLightBrightness", props);
+        }
+
         public void FindPropertiesPlusCull(MaterialProperty[] props)
         {
             cullMode = FindProperty("_Cull", props);
         }
-        
+
         protected void PlusOptions(Material material)
         {
             GUILayout.Label("Plus Options", EditorStyles.largeLabel);
@@ -167,9 +175,15 @@ protected void LightVolumesOptions(Material material)
         protected void OtherOptions()
         {
             GUILayout.Label("Other Options", EditorStyles.boldLabel);
+            MinBrightnessOptions();
             TwoSidedPopup();
         }
 
+        protected void MinBrightnessOptions()
+        {
+            m_MaterialEditor.ShaderProperty(min_brightness, EditorGUIUtility.TrTextContent(min_brightness.displayName));
+        }
+
         protected void TwoSidedPopup()
         {
             if (cullMode == null) { return; }

README.md

@@ -32,10 +32,13 @@ toggles for visibility in VRChat when seen directly, in mirrors, on screenshots,
 - [**VRC Light Volumes**](https://github.com/REDSIM/VRCLightVolumes)<br>
 <img src="https://github.com/user-attachments/assets/2cfe3af9-1d6c-470c-901a-218bae1a55cf" width="512" alt="presenting the VRC Light Volumes support" /><br>
 support for the cool new "voxel based light probes replacement" (v2.1).
+- **Minimum Brightness**<br>
+support for the "Minimum Brightness" property, allowing you to remain visible in darker areas of VRC worlds \[a\].
 - **Two Sided**<br>
-turning off backface culling if you need a mesh to be visible from both sides, to avoid having to duplicate mesh faces\*.
+turning off backface culling if you need a mesh to be visible from both sides, to avoid having to duplicate mesh faces \[a\]\[b\].
 
-\* Available in some built-in shaders, simply copied to the others. Also, see "Known issues" section below.
+\[a\] See the "Known issues" section below.<br>
+\[b\] Available in some built-in shaders, simply copied to the others.<br>
 
 
 ### Example
@@ -69,6 +72,7 @@ Voilà!<br>
 ### Known issues:
 - The Two Sided option doesn't work when toggled in VRChat - it needs to be set before upload.
 - Since I had to create a custom editor for Unlit shaders, the Inspector view doesn't look exactly the way the default one does. (The shaders themselves work just fine, though.)
+- I disabled the "Minimum Brightness" property in "Transparent" Rendering Mode (or, more technically speaking, whenever the `_ALPHAPREMULTIPLY_ON` keyword is on), because it won't work correctly (or at least I don't know how to make it work).
 
 
 ### Contact