hdrp fixes: setup Opaque materials properly

Author: robertdorn83

Runtime/Scripts/SceneImporter/ImporterMaterials.cs

@@ -220,6 +220,14 @@ void SetTransformKeyword()
 			var KHR_materials_anisotropy = settings && settings.KHR_materials_anisotropy;
 			// ReSharper restore InconsistentNaming
 
+			var isHDRP = false;
+			var renderPipelineAsset =  UnityEngine.Rendering.GraphicsSettings.currentRenderPipeline;
+			if (renderPipelineAsset)
+			{ 
+				var renderPipeline = renderPipelineAsset.GetType().Name;
+				isHDRP = renderPipeline == "HighDefinitionRenderPipelineAsset" || renderPipeline == "HDRenderPipelineAsset";
+			}
+		
 			var sgMapper = mapper as ISpecGlossUniformMap;
 			if (sgMapper != null && KHR_materials_pbrSpecularGlossiness)
 			{
@@ -422,6 +430,12 @@ void SetTransformKeyword()
 			if (transmissionMapper != null && KHR_materials_transmission)
 			{
 				var transmission = GetTransmission(def);
+
+				// TODO: maybe find a better solution.
+				// currently to avoid the creation of transmission materials when it's actually not using it
+				if (transmission != null && transmission.transmissionFactor == 0f && isHDRP)
+					transmission = null;
+				
 				if (transmission != null)
 				{
 					transmissionMapper.TransmissionFactor = transmission.transmissionFactor;
@@ -449,7 +463,9 @@ void SetTransformKeyword()
 						}
 					}
 
-					mapper.Material.renderQueue = 3000;
+					if (!isHDRP)
+						mapper.Material.renderQueue = 3000;
+			
 #if UNITY_VISIONOS
 					mapper.AlphaMode = AlphaMode.BLEND;
 #endif
@@ -513,7 +529,8 @@ void SetTransformKeyword()
 						}
 					}
 
-					mapper.Material.renderQueue = 3000;
+					if (!isHDRP)
+						mapper.Material.renderQueue = 3000;
 					mapper.Material.SetFloat("_VOLUME_ON", 1f);
 				}
 			}

Runtime/Scripts/UniformMaps/BaseGraphMap.cs

@@ -88,6 +88,8 @@ public virtual AlphaMode AlphaMode
 			    {
 				    _material.SetOverrideTag("RenderType", "TransparentCutout");
 				    _material.SetFloat("_Mode", 1);
+				    _material.SetFloat("_SurfaceType", 0);
+
 				    _material.SetInt("_SrcBlend", (int)BlendMode.One);
 				    _material.SetInt("_DstBlend", (int)BlendMode.Zero);
 				    _material.SetInt("_BUILTIN_SrcBlend", (int)BlendMode.One);
@@ -114,6 +116,8 @@ public virtual AlphaMode AlphaMode
 			    {
 				    _material.SetOverrideTag("RenderType", "Transparent");
 				    _material.SetFloat("_Mode", 2);
+				    _material.SetFloat("_SurfaceType", 1);
+
 				    _material.SetInt("_SrcBlend", (int)BlendMode.SrcAlpha);
 				    _material.SetInt("_DstBlend", (int)BlendMode.OneMinusSrcAlpha);
 				    _material.SetInt("_BUILTIN_SrcBlend", (int)BlendMode.SrcAlpha);
@@ -139,6 +143,7 @@ public virtual AlphaMode AlphaMode
 			    {
 				    _material.SetOverrideTag("RenderType", "Opaque");
 				    _material.SetFloat("_Mode", 0);
+				    _material.SetFloat("_SurfaceType", 0);
 				    _material.SetInt("_SrcBlend", (int)BlendMode.One);
 				    _material.SetInt("_DstBlend", (int)BlendMode.Zero);
 				    _material.SetInt("_BUILTIN_SrcBlend", (int)BlendMode.One);
@@ -154,6 +159,8 @@ public virtual AlphaMode AlphaMode
 				    _material.DisableKeyword("_BUILTIN_ALPHABLEND_ON");
 				    _material.DisableKeyword("_BUILTIN_ALPHAPREMULTIPLY_ON");
 				    _material.renderQueue = (int)RenderQueue.Geometry;
+
+				    SetShaderModeOpaque(_material);
 			    }
 
 			    _alphaMode = value;
@@ -218,6 +225,29 @@ protected void SetAlphaModeMask(Material material, bool isMask) {
 	    const string k_ShaderPassRayTracingPrepass = "RayTracingPrepass";
 	    const string k_ShaderPassDepthOnlyPass = "DepthOnly";
 
+	    protected void SetShaderModeOpaque(Material material)
+	    {
+		    material.SetOverrideTag(TAG_RENDER_TYPE, TAG_RENDER_TYPE_OPAQUE);
+		    material.DisableKeyword(KW_SURFACE_TYPE_TRANSPARENT);
+		    material.DisableKeyword(KW_SURFACE_TYPE_TRANSPARENT_BUILTIN);
+		    material.DisableKeyword(KW_DISABLE_SSR_TRANSPARENT);
+		    material.DisableKeyword(KW_ENABLE_FOG_ON_TRANSPARENT);
+		    material.DisableKeyword(KW_ALPHACLIP_ON_BUILTIN);
+		    material.SetShaderPassEnabled(k_ShaderPassTransparentDepthPrepass, true);
+		    material.SetShaderPassEnabled(k_ShaderPassTransparentDepthPostpass, true);
+		    material.SetShaderPassEnabled(k_ShaderPassTransparentBackface, true);
+		    material.SetShaderPassEnabled(k_ShaderPassRayTracingPrepass, true);
+		    material.SetShaderPassEnabled(k_ShaderPassDepthOnlyPass, true);
+		    material.SetFloat(srcBlendPropId, (int)BlendMode.One);
+		    material.SetFloat(dstBlendPropId, (int)BlendMode.Zero);
+		    material.SetFloat(k_ZTestGBufferPropId, (int)CompareFunction.LessEqual); //4
+		    material.SetFloat(k_AlphaDstBlendPropId, (int)BlendMode.Zero);
+		    material.SetFloat(k_Surface, 0);
+		    material.SetFloat(k_SurfaceBuiltin, 0);
+		    material.SetFloat(zWritePropId, 1);
+		    material.SetFloat(alphaToMask, 0);
+	    }
+
 	    protected void SetShaderModeBlend(Material material)
 	    {
 		    material.SetOverrideTag(TAG_RENDER_TYPE, TAG_RENDER_TYPE_TRANSPARENT);