Merge pull request #2 from Netherlands3D/feature/supporting-receive-shadows-tile-shader

replacing the basic unlit shader with a custom 3d tiles shader for fotorealistic mesh to support receiving shadows

Author: bozmir

Runtime/Scripts/Export/GltfWriter.cs

@@ -276,7 +276,7 @@ public bool AddLight(Light uLight, out int lightId)
                 case LightType.Point:
                     light.SetLightType(LightPunctual.Type.Point);
                     break;
-                case LightType.Area:
+                case LightType.Rectangle:
                 case LightType.Disc:
                 default:
                     light.SetLightType(LightPunctual.Type.Spot);

Runtime/Scripts/Material/ShaderGraphMaterialGenerator.cs

@@ -85,7 +85,7 @@ protected enum UnlitShaderFeatures {
         /// <summary>Name of the shader graph used for PBR metallic/roughness materials</summary>
         public const string MetallicShader = "glTF-pbrMetallicRoughness";
         /// <summary>Name of the shader graph used for unlit materials</summary>
-        public const string UnlitShader = "glTF-unlit";
+        public const string UnlitShader = "3dTilesShader";
         /// <summary>Name of the shader graph used for PBR specular/glossiness materials</summary>
         public const string SpecularShader = "glTF-pbrSpecularGlossiness";
 
@@ -498,8 +498,13 @@ Shader LoadShaderByName(string shaderName) {
             var shaderPath = $"{k_ShaderPathPrefix}{shaderName}.shadergraph";
             Debug.Log(shaderPath);
             var shader = AssetDatabase.LoadAssetAtPath<Shader>(shaderPath);
-            if (shader == null) {
-                Logger?.Error($"Cannot load shader at path {shaderPath}");
+            if (shader == null) 
+            {
+                shaderPath = $"{k_ShaderPathPrefix}{shaderName}.shader";
+                shader = AssetDatabase.LoadAssetAtPath<Shader>(shaderPath);
+                if (shader == null) {
+                    Logger?.Error($"Cannot load shader at path {shaderPath}");
+                }            
             }
             return shader;
 #else

Runtime/Shader/3dTilesShader.shader

@@ -0,0 +1,101 @@
+Shader "Custom/Tiles3D"
+{
+    Properties
+    {
+        _Color ("Color", Color) = (1,1,1,1)
+        baseColorTexture ("Base Color Texture", 2D) = "white" {}
+    }
+    SubShader
+    {
+        Tags { 
+            "RenderPipeline" = "UniversalPipeline" 
+            "IgnoreProjector" = "True" 
+            "Queue" = "Geometry" 
+            "RenderType" = "Opaque"
+        }
+        LOD 100
+        Blend SrcAlpha OneMinusSrcAlpha
+
+        Pass
+        {
+            Name "ForwardLit"
+            Tags { "LightMode" = "UniversalForward" }
+
+            HLSLPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+           
+            #pragma multi_compile _ _MAIN_LIGHT_SHADOWS
+            #pragma multi_compile _ _MAIN_LIGHT_SHADOWS_CASCADE
+            #pragma multi_compile _ _ADDITIONAL_LIGHTS_VERTEX _ADDITIONAL_LIGHTS
+            #pragma multi_compile _ _ADDITIONAL_LIGHT_SHADOWS
+            #pragma multi_compile _ _SHADOWS_SOFT
+            #pragma multi_compile _ _MIXED_LIGHTING_SUBTRACTIVE
+
+            #pragma multi_compile_instancing
+
+            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
+            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl"
+            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Shadows.hlsl"
+
+            struct appdata
+            {
+                float4 vertex : POSITION;
+                float3 normal : NORMAL;
+                float2 uv : TEXCOORD0;
+            };
+
+            struct v2f
+            {
+                float4 vertex : SV_POSITION;
+                float3 normal : TEXCOORD0;
+                float3 worldPos : TEXCOORD1;
+                float2 uv : TEXCOORD2;
+                float4 shadowCoord : TEXCOORD3;
+            };
+
+            sampler2D baseColorTexture;
+            float4 _Color;
+
+            v2f vert (appdata v)
+            {
+                v2f o;
+                o.vertex = TransformObjectToHClip(v.vertex);
+                o.worldPos = TransformObjectToWorld(v.vertex);
+                o.normal = TransformObjectToWorldNormal(v.normal);
+                o.uv = v.uv;
+               
+                VertexPositionInputs posInputs = GetVertexPositionInputs(v.vertex.xyz);
+                o.shadowCoord = TransformWorldToShadowCoord(o.worldPos);
+
+                return o;
+            }
+
+            float3 Lambert(float3 lightColor, float3 lightDir, float3 normal)
+            {
+                float NdotL = saturate(dot(normal, lightDir));
+                return lightColor * NdotL;
+            }
+
+            float4 frag (v2f i) : SV_Target
+            {
+                float4 texColor = tex2D(baseColorTexture, i.uv);
+                float4 color = texColor * _Color;
+                               
+                Light mainLight = GetMainLight(i.shadowCoord); //get dir light
+                float3 lightCol = Lambert(mainLight.color * mainLight.shadowAttenuation, mainLight.direction, float3(0,1,0)); //lets keep up normal always
+
+                // uint lightsCount = GetAdditionalLightsCount();
+                // for (int j = 0; j < lightsCount; j++)
+                // {
+                //     Light light = GetAdditionalLight(j, i.worldPos);
+                //     lightCol += Lambert(light.color * (light.distanceAttenuation * light.shadowAttenuation), light.direction, i.normal);
+                // }
+
+                color.rgb *= lightCol + 1;
+                return color;
+            }
+            ENDHLSL
+        }
+    }
+}