这是一篇年前：2021.1.28 些的日志

主要是备忘用

帮美术同学修改完 shader 后
发现烘焙后 alpha test 的 shader 都没有了投影镂空的效果

导致树叶之间的投影乌黑一大片，然后搜索了一下

还好的是，发现 taecg 老师也在某乎上写过这个问题的处理分享

看了这篇文章就知道：unity黑箱 + 文档不说明有多 e xin：关于AlphaTest阴影烘焙后消失的问题

处理要点：

主纹理名称必须是"_MainTex",只有这个名称才会被内部识别到，就像后处理Shader中也需要用到这个名称是一样的道理。
Shader中的Queue排序在2450-3999之间，也就是"Queue" = “AlphaTest"或者"Queue” = “Transparent”.
RenderType设置为"RenderType" = “Transparent"或者"RenderType” = “TransparentCutout”.

记住要处理：Forwardbase 和 ShadowCaster 两个 shader 的 tag, queue 等

如果我们要重写 ShaderGUI 那么注意处理这两点即可，如下：

References

关于AlphaTest阴影烘焙后消失的问题

// jave.lin 2022/08/27 为 SanGuo_PBR_MRA_SSS shader 材质的编辑器重写using UnityEngine;
using UnityEditor;
using System;
using System.Collections.Generic;public enum JAVELIN_RenderType
{Opaque,AlphaTest,TransparentWithoutPMA,TransparentWithPMA,Additive,Subtractive,
}public enum JAVELIN_ShowFaceType
{Front,Back,DoubleSide,
}public class SanGuo_PBR_MRA_SSS_MAT_GUI : ShaderGUI
{static MaterialProperty FindAndRemoveProperty(string propertyName, List<MaterialProperty> propertyList){return FindAndRemoveProperty(propertyName, propertyList, true);}static MaterialProperty FindAndRemoveProperty(string propertyName, List<MaterialProperty> propertyList, bool propertyIsMandatory){for (var i = 0; i < propertyList.Count; i++)if (propertyList[i] != null && propertyList[i].name == propertyName){var property = propertyList[i];propertyList.RemoveAt(i);return property;}// We assume all required properties can be found, otherwise something is brokenif (propertyIsMandatory)throw new ArgumentException("Could not find MaterialProperty: '" + propertyName + "', Num properties: " + propertyList.Count);return null;}private static bool IsEnabledKW(string kw, Material target){return target.IsKeywordEnabled(kw);}// jave.lin : 参考：2020.3.37f1 builtin shader StandardParticlesShaderGUI.cs 的 SetupMaterialWithBlendMode 函数public static void SettingMatBlendMode(Material material, JAVELIN_RenderType blendMode){switch (blendMode){case JAVELIN_RenderType.Opaque:material.SetOverrideTag("RenderType", "Geometry");material.SetInt("_BlendOp", (int)UnityEngine.Rendering.BlendOp.Add);material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One);material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.Zero);material.SetInt("_ZWrite", 1);material.DisableKeyword("_ALPHATEST_ON");material.DisableKeyword("_ALPHABLEND_ON");material.DisableKeyword("_ALPHAPREMULTIPLY_ON");//material.DisableKeyword("_ALPHAMODULATE_ON");material.renderQueue = (int)UnityEngine.Rendering.RenderQueue.Geometry;break;case JAVELIN_RenderType.AlphaTest:material.SetOverrideTag("RenderType", "TransparentCutout");material.SetOverrideTag("Queue", "AlphaTest");material.SetInt("_BlendOp", (int)UnityEngine.Rendering.BlendOp.Add);material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One);material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.Zero);material.SetInt("_ZWrite", 1);material.EnableKeyword("_ALPHATEST_ON");material.DisableKeyword("_ALPHABLEND_ON");material.DisableKeyword("_ALPHAPREMULTIPLY_ON");//material.DisableKeyword("_ALPHAMODULATE_ON");material.renderQueue = (int)UnityEngine.Rendering.RenderQueue.AlphaTest;break;case JAVELIN_RenderType.TransparentWithoutPMA:material.SetOverrideTag("RenderType", "Transparent");material.SetInt("_BlendOp", (int)UnityEngine.Rendering.BlendOp.Add);material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.SrcAlpha);material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha);material.SetInt("_ZWrite", 0);material.DisableKeyword("_ALPHATEST_ON");material.DisableKeyword("_ALPHABLEND_ON");material.DisableKeyword("_ALPHAPREMULTIPLY_ON");//material.DisableKeyword("_ALPHAMODULATE_ON");material.renderQueue = (int)UnityEngine.Rendering.RenderQueue.Transparent;break;case JAVELIN_RenderType.TransparentWithPMA:material.SetOverrideTag("RenderType", "Transparent");material.SetInt("_BlendOp", (int)UnityEngine.Rendering.BlendOp.Add);material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One);material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha);material.SetInt("_ZWrite", 0);material.DisableKeyword("_ALPHATEST_ON");material.DisableKeyword("_ALPHABLEND_ON");material.EnableKeyword("_ALPHAPREMULTIPLY_ON");//material.DisableKeyword("_ALPHAMODULATE_ON");material.renderQueue = (int)UnityEngine.Rendering.RenderQueue.Transparent;break;case JAVELIN_RenderType.Additive:material.SetOverrideTag("RenderType", "Transparent");material.SetInt("_BlendOp", (int)UnityEngine.Rendering.BlendOp.Add);material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.SrcAlpha);material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.One);material.SetInt("_ZWrite", 0);material.DisableKeyword("_ALPHATEST_ON");material.EnableKeyword("_ALPHABLEND_ON");material.DisableKeyword("_ALPHAPREMULTIPLY_ON");//material.DisableKeyword("_ALPHAMODULATE_ON");material.renderQueue = (int)UnityEngine.Rendering.RenderQueue.Transparent;break;case JAVELIN_RenderType.Subtractive:material.SetOverrideTag("RenderType", "Transparent");material.SetInt("_BlendOp", (int)UnityEngine.Rendering.BlendOp.ReverseSubtract);material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.SrcAlpha);material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.One);material.SetInt("_ZWrite", 0);material.DisableKeyword("_ALPHATEST_ON");material.EnableKeyword("_ALPHABLEND_ON");material.DisableKeyword("_ALPHAPREMULTIPLY_ON");//material.DisableKeyword("_ALPHAMODULATE_ON");material.renderQueue = (int)UnityEngine.Rendering.RenderQueue.Transparent;break;}}public static void SettingMatShowFaceType(Material material, JAVELIN_ShowFaceType showFaceType){switch (showFaceType){case JAVELIN_ShowFaceType.Front:material.SetInt("_Cull", (int)UnityEngine.Rendering.CullMode.Back);break;case JAVELIN_ShowFaceType.Back:material.SetInt("_Cull", (int)UnityEngine.Rendering.CullMode.Front);break;case JAVELIN_ShowFaceType.DoubleSide:material.SetInt("_Cull", (int)UnityEngine.Rendering.CullMode.Off);break;}}private MaterialProperty renderTypeProp;private MaterialProperty showFaceTypeProp;public void FindProperties(MaterialProperty[] props){renderTypeProp = FindProperty("_JL_RenderType", props, false);showFaceTypeProp = FindProperty("_JL_ShowFaceType", props, false);}public override void OnGUI(MaterialEditor materialEditor, MaterialProperty[] properties){FindProperties(properties);Material targetMat = materialEditor.target as Material;List<MaterialProperty> propertyList = new List<MaterialProperty>(properties);FindAndRemoveProperty("_Parallax", propertyList, false);FindAndRemoveProperty("_ParallaxMap", propertyList, false);FindAndRemoveProperty("_DetailMask", propertyList, false);FindAndRemoveProperty("_DetailAlbedoMap", propertyList, false);FindAndRemoveProperty("_DetailNormalMapScale", propertyList, false);FindAndRemoveProperty("_DetailNormalMap", propertyList, false);FindAndRemoveProperty("_UVSec", propertyList, false);FindAndRemoveProperty("_SpecularHighlights", propertyList, false);FindAndRemoveProperty("_GlossyReflections", propertyList, false);FindAndRemoveProperty("_ALPHATEST", propertyList, false);FindAndRemoveProperty("_ALPHABLEND", propertyList, false);FindAndRemoveProperty("_JL_RenderType", propertyList, false);FindAndRemoveProperty("_JL_ShowFaceType", propertyList, false);FindAndRemoveProperty("_Cull", propertyList, false);FindAndRemoveProperty("_ZWrite", propertyList, false);FindAndRemoveProperty("_SrcBlend", propertyList, false);FindAndRemoveProperty("_DstBlend", propertyList, false);// jave.lin : 根据变体开关来控制 材质属性的显示隐藏var alphatest_on = IsEnabledKW("_ALPHATEST_ON", targetMat);var emission_on = IsEnabledKW("_EMISSION", targetMat);//var sss_on = IsEnabledKW("_SSS_ON", targetMat);if (!alphatest_on){FindAndRemoveProperty("_Cutoff", propertyList, false);}if (!emission_on){FindAndRemoveProperty("_EmissionColor", propertyList, false);FindAndRemoveProperty("_EmissionMap", propertyList, false);}//if (!sss_on)//{//    FindAndRemoveProperty("_TranslucentDistortion", propertyList, false);//    FindAndRemoveProperty("_TranslucentPower", propertyList, false);//    FindAndRemoveProperty("_TranslucentScale", propertyList, false);//    FindAndRemoveProperty("_TranslucentAmbientScale", propertyList, false);//}//var srcRenderType = renderTypeProp.floatValue;//materialEditor.ShaderProperty(renderTypeProp, "RenderType");//var newRenderType = renderTypeProp.floatValue;//if (srcRenderType != newRenderType)//{//    renderTypeProp.floatValue = (int)newRenderType;//    materialEditor.RegisterPropertyChangeUndo("renderType");//    materialEditor.PropertiesChanged();//}// jave.lin : render type{var src_val = (JAVELIN_RenderType)((int)renderTypeProp.floatValue);var new_val = (JAVELIN_RenderType)EditorGUILayout.EnumPopup("RenderType", src_val, GUILayout.ExpandWidth(true));if (src_val != new_val){renderTypeProp.floatValue = (int)new_val;SettingMatBlendMode(targetMat, new_val);}}// jave.lin : show face type{var src_val = (JAVELIN_ShowFaceType)((int)showFaceTypeProp.floatValue);var new_val = (JAVELIN_ShowFaceType)EditorGUILayout.EnumPopup("ShowFaceType", src_val, GUILayout.ExpandWidth(true));if (src_val != new_val){showFaceTypeProp.floatValue = (int)new_val;SettingMatShowFaceType(targetMat, new_val);}}if (propertyList.Count > 0){for (int i = 0; i < propertyList.Count; i++){materialEditor.ShaderProperty(propertyList[i], propertyList[i].displayName);}}materialEditor.RenderQueueField();}
}

注意

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unity - 踩坑记录 - 关于AlphaTest投影烘焙后没有镂空的问题

References

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