Add shadowcaster support to lighting and shaders

Introduces shadowcaster support by adding shadow map index fields to light data, updating PlayerPositionsToShader and LightdataStorage to handle shadow map indices, and extending the shader and its includes to sample shadowcaster planes. Adds ShadowcasterUpdater script and editor preview for updating world-to-local matrices, and updates relevant arrays and property handling throughout the codebase. Also adds a sample plane mesh for shadowcasting.

Scripts/LightdataStorage.cs

@@ -32,6 +32,10 @@ public class LightdataStorage : UdonSharpBehaviour
     [Tooltip("0 = omni (no cone)")]
     public float spotAngleDeg = 0f;
 
+    [Header("Shadow Settings")]
+    [Tooltip("0 = no shadows, 1-4 = shadow map index")]
+    public float shadowMapIndex = 0f; // 0 = no shadows, 1-4 = shadow map index
+
     // Convert to a Vector4 for your shader upload
     public Vector4 GetFinalColor()
     {

Scripts/PlayerPositionsToShader.cs

@@ -24,6 +24,9 @@ public partial class PlayerPositionsToShader : UdonSharpBehaviour
     public float playerLightIntensity = 5f;
     public float remoteLightIntensity = 2f;
 
+    [Tooltip("0 = no shadows, 1-4 = shadow map index")]
+    public float PlayerShadowMapIndex = 0f; // 0 = no shadows, 1-4 = shadow map index
+
 
     [Header("Shader property names (advanced users)")]
     [Tooltip("Vector4 array: xyz = position, w = range")]
@@ -41,6 +44,9 @@ public partial class PlayerPositionsToShader : UdonSharpBehaviour
     [Tooltip("float array: light type (1=area, 2=cone, etc)")]
     public string typeProperty = "_Udon_LightType";
 
+    [Tooltip("float array: shadow map index (0=none, 1-4=shadow map index)")]
+    public string shadowMapIndexProperty = "_Udon_ShadowMapIndex";
+
     [Header("Max Lights (advanced users)")]
     [Tooltip("Hard cap / array size. 80 = default cap")]
     public int maxLights = 80;
@@ -57,9 +63,11 @@ public partial class PlayerPositionsToShader : UdonSharpBehaviour
 
     private float[] _TypeArray;
     private bool _TypeArray_isDirty = false;
+    private float[] _ShadowMapArray;
+    private bool _ShadowMap_isDirty = false;
 
     private VRCPlayerApi[] _players;
-    private MaterialPropertyBlock _mpb;
+
 
     public int currentCount { get; private set; }
 
@@ -70,6 +78,7 @@ public partial class PlayerPositionsToShader : UdonSharpBehaviour
     private int UdonID_LightColors;
     private int UdonID_LightDirections;
     private int UdonID_LightType;
+    private int UdonID_ShadowMapIndex;
 
     void Start()
     {
@@ -79,15 +88,16 @@ public partial class PlayerPositionsToShader : UdonSharpBehaviour
         _lightColors = new Vector4[maxLights];
         _directions  = new Vector4[maxLights];
         _TypeArray   = new float[maxLights];
+        _ShadowMapArray = new float[maxLights];
 
         _players = new VRCPlayerApi[maxLights];
-        _mpb = new MaterialPropertyBlock();
 
         UdonID_PlayerPositions = VRCShader.PropertyToID(positionsProperty);
         UdonID_LightCount = VRCShader.PropertyToID(countProperty);
         UdonID_LightColors = VRCShader.PropertyToID(colorProperty);
         UdonID_LightDirections = VRCShader.PropertyToID(directionsProperty);
         UdonID_LightType = VRCShader.PropertyToID(typeProperty);
+        UdonID_ShadowMapIndex = VRCShader.PropertyToID(shadowMapIndexProperty);
 
 
         UpdateData();
@@ -150,6 +160,11 @@ public partial class PlayerPositionsToShader : UdonSharpBehaviour
                     _TypeArray[i] = 0f;
                     _TypeArray_isDirty = true;
                 }
+                if (_ShadowMapArray[i] != PlayerShadowMapIndex)
+                {
+                    _ShadowMapArray[i] = PlayerShadowMapIndex;
+                    _ShadowMap_isDirty = true;
+                }
 
 
             }
@@ -175,6 +190,11 @@ public partial class PlayerPositionsToShader : UdonSharpBehaviour
                     _TypeArray[i] = 0f;
                     _TypeArray_isDirty = true;
                 }
+                if (_ShadowMapArray[i] != 0f)
+                {
+                    _ShadowMapArray[i] = 0f;
+                    _ShadowMap_isDirty = true;
+                }
             }
         }
 
@@ -230,6 +250,13 @@ public partial class PlayerPositionsToShader : UdonSharpBehaviour
                     _TypeArray_isDirty = true;
                 }
 
+                float shadowMapIndex = (data != null) ? data.shadowMapIndex : 0f;
+                if (_ShadowMapArray[currentCount] != shadowMapIndex)
+                {
+                    _ShadowMapArray[currentCount] = shadowMapIndex;
+                    _ShadowMap_isDirty = true;
+                }
+
                 currentCount++;
             }
         }
@@ -259,6 +286,12 @@ public partial class PlayerPositionsToShader : UdonSharpBehaviour
                 _TypeArray[i] = 0f;
                 _TypeArray_isDirty = true;
             }
+
+            if (_ShadowMapArray[i] != 0f)
+            {
+                _ShadowMapArray[i] = 0f;
+                _ShadowMap_isDirty = true;
+            }
         }
     }
 
@@ -267,23 +300,26 @@ public partial class PlayerPositionsToShader : UdonSharpBehaviour
 
         // Snapshot which things are dirty this frame
         bool pushPositions = _positons_isDirty;
-        bool pushColors    = _lightColors_isDirty;
-        bool pushDirs      = _directions_isDirty;
-        bool pushTypes     = _TypeArray_isDirty && !string.IsNullOrEmpty(typeProperty);
+        bool pushColors = _lightColors_isDirty;
+        bool pushDirs = _directions_isDirty;
+        bool pushTypes = _TypeArray_isDirty && !string.IsNullOrEmpty(typeProperty);
+        bool pushShadowMap = _ShadowMap_isDirty;
 
 
         if (pushPositions) VRCShader.SetGlobalVectorArray(UdonID_PlayerPositions, _positions);
-        if (pushColors)    VRCShader.SetGlobalVectorArray(UdonID_LightColors,    _lightColors);
-        if (pushDirs)      VRCShader.SetGlobalVectorArray(UdonID_LightDirections, _directions);
-        if (pushTypes)     _mpb.SetFloatArray(UdonID_LightType, _TypeArray);
+        if (pushColors) VRCShader.SetGlobalVectorArray(UdonID_LightColors, _lightColors);
+        if (pushDirs) VRCShader.SetGlobalVectorArray(UdonID_LightDirections, _directions);
+        if (pushTypes) VRCShader.SetGlobalFloatArray(UdonID_LightType, _TypeArray);
+        if (pushShadowMap) VRCShader.SetGlobalFloatArray(UdonID_ShadowMapIndex, _ShadowMapArray);
 
         VRCShader.SetGlobalFloat(UdonID_LightCount, currentCount);
-
+        Debug.Log($"[MoonlightVRC] Pushed {currentCount} lights to shader.");
 
         // Only now mark them clean
-        if (pushPositions) { _positons_isDirty = false;}
-        if (pushColors)    { _lightColors_isDirty = false;}
-        if (pushDirs)      { _directions_isDirty = false;}
-        if (pushTypes)     { _TypeArray_isDirty = false;}
+        if (pushPositions) { _positons_isDirty = false; }
+        if (pushColors) { _lightColors_isDirty = false; }
+        if (pushDirs) { _directions_isDirty = false; }
+        if (pushTypes) { _TypeArray_isDirty = false; }
+        if (pushShadowMap) { _ShadowMap_isDirty = false; }
     }
 }

Scripts/ShadowcasterUpdater.cs

@@ -0,0 +1,35 @@
+
+using System.Security.Permissions;
+using UdonSharp;
+using UnityEngine;
+using VRC.SDKBase;
+using VRC.Udon;
+
+public class ShadowcasterUpdater : UdonSharpBehaviour
+{
+
+    public Renderer[] rendererTargets;
+    public string propertyName = "_Udon_WorldToLocal";
+    private MaterialPropertyBlock _mpb;
+
+    void Start()
+    {
+        _mpb = new MaterialPropertyBlock();
+    }
+    
+
+    void LateUpdate()
+    {
+        var w2l = transform.worldToLocalMatrix;
+
+
+        foreach (Renderer mat in rendererTargets)
+        {
+            if (mat == null) continue;
+            mat.GetPropertyBlock(_mpb);
+            _mpb.SetMatrix(propertyName, w2l);
+            mat.SetPropertyBlock(_mpb);
+        }
+
+    }
+}

Scripts/ShadowcasterUpdater.cs.meta

@@ -0,0 +1,11 @@
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