窺探到一點關於HDRP/Lit shader的一些參數，比如mat.SetTexture("_BaseColorMap", DiffuseMap);

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Unity-Technologies/usd-unity-sdk

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usd-unity-sdk/package/com.unity.formats.usd/Runtime/Scripts/IO/Materials/HdrpShaderImporter.cs

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 jcowles Namespace: Rename to Unity.Formats.USD3a70e60 on 18 Feb

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	// Copyright 2018 Jeremy Cowles. All rights reserved.
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.
	using UnityEngine;
	namespace Unity.Formats.USD {
	public class HdrpShaderImporter : ShaderImporterBase {
	private static Material ChannelCombinerMat;
	public HdrpShaderImporter(Material material) : base(material) {
	}
	public override void ImportFromUsd() {
	Material mat = Material;
	if (DiffuseMap) {
	Debug.Log("here");
	mat.SetTexture("_BaseColorMap", DiffuseMap);
	mat.SetColor("_BaseColor", Color.white);
	} else {
	mat.SetColor("_BaseColor", Diffuse.GetValueOrDefault(mat.color));
	}
	// TODO: What about opacity map?
	if (IsMetallicWorkflow) {
	// Robustness: It would be ideal if this parameter were provided by HDRP, however that
	// would require this asset package having a dependency on the HDRP package itself,
	// which is (yet) not desirable.
	mat.SetFloat("_MaterialID", /*Standard Metallic*/ 1);
	} else {
	mat.SetFloat("_MaterialID", /*Spec Color*/ 4);
	mat.EnableKeyword("_MATERIAL_FEATURE_SPECULAR_COLOR");
	mat.EnableKeyword("_SPECULARCOLORMAP");
	}
	// R=Metallic, G=Occlusion, B=Displacement, A=Roughness(Smoothness)
	var MaskMap = BuildMaskMap(IsMetallicWorkflow ? MetallicMap : null, OcclusionMap, DisplacementMap, RoughnessMap);
	if (MaskMap) {
	mat.SetTexture("_MaskMap", MaskMap);
	mat.EnableKeyword("_MASKMAP");
	}
	if (IsMetallicWorkflow) {
	if (!MetallicMap) {
	mat.SetFloat("_Metallic", Metallic.GetValueOrDefault());
	}
	} else {
	if (SpecularMap) {
	mat.SetTexture("_SpecularColorMap", SpecularMap);
	} else {
	mat.SetColor("_SpecularColor", Specular.GetValueOrDefault());
	}
	}
	if (!RoughnessMap) {
	var smoothness = 1 - Roughness.GetValueOrDefault();
	mat.SetFloat("_Smoothness", smoothness);
	// HDRP Lit does not seem to respect smoothness, so just clamp to the correct value.
	mat.SetFloat("_SmoothnessRemapMin", smoothness);
	mat.SetFloat("_SmoothnessRemapMax", smoothness);
	}
	if (!OcclusionMap) {
	mat.SetFloat("_AORemapMin", Occlusion.GetValueOrDefault());
	mat.SetFloat("_AORemapMax", Occlusion.GetValueOrDefault());
	}
	// Single displacement scalar value not supported.
	if (ClearcoatMap) {
	mat.SetTexture("_CoatMaskMap", ClearcoatMap);
	mat.EnableKeyword("_MATERIAL_FEATURE_CLEAR_COAT");
	}
	mat.SetFloat("_CoatMask", ClearcoatRoughness.GetValueOrDefault());
	if (NormalMap) {
	mat.SetTexture("_NormalMap", NormalMap);
	mat.EnableKeyword("_NORMALMAP");
	}
	if (EmissionMap) {
	mat.SetTexture("_EmissionMap", EmissionMap);
	mat.EnableKeyword("_EMISSIVE_COLOR_MAP");
	} else {
	mat.SetColor("_EmissionColor", Emission.GetValueOrDefault());
	}
	}
	private static Texture2D BuildMaskMap(Texture2D red, Texture2D green, Texture2D blue, Texture2D alpha) {
	var maxW = Mathf.Max(red ? red.width : 0, green ? green.width : 0);
	maxW = Mathf.Max(maxW, blue ? blue.width : 0);
	maxW = Mathf.Max(maxW, alpha ? alpha.width : 0);
	var maxH = Mathf.Max(red ? red.height : 0, green ? green.height : 0);
	maxH = Mathf.Max(maxH, blue ? blue.height : 0);
	maxH = Mathf.Max(maxH, alpha ? alpha.height : 0);
	if (maxH == 0 || maxW == 0) { return null; }
	var tmp = RenderTexture.GetTemporary(maxW, maxH, 0, RenderTextureFormat.ARGBFloat, RenderTextureReadWrite.Linear);
	if (!ChannelCombinerMat) {
	ChannelCombinerMat = new Material(Shader.Find("Hidden/USD/ChannelCombiner"));
	}
	var newTex = new Texture2D(maxW, maxH, TextureFormat.ARGB32, true, true);
	ChannelCombinerMat.SetFloat("_InvertAlpha", 1);
	ChannelCombinerMat.SetTexture("_R", red);
	ChannelCombinerMat.SetTexture("_G", green);
	ChannelCombinerMat.SetTexture("_B", blue);
	ChannelCombinerMat.SetTexture("_A", alpha);
	Graphics.Blit(red, tmp, ChannelCombinerMat);
	RenderTexture.active = tmp;
	newTex.ReadPixels(new Rect(0, 0, tmp.width, tmp.height), 0, 0);
	newTex.Apply();
	RenderTexture.ReleaseTemporary(tmp);
	#if UNITY_EDITOR
	var newAssetPath = UnityEditor.AssetDatabase.GenerateUniqueAssetPath("Assets/maskMap.png");
	var bytes = newTex.EncodeToPNG();
	Debug.Log(newAssetPath);
	System.IO.File.WriteAllBytes(newAssetPath, bytes);
	UnityEditor.AssetDatabase.ImportAsset(newAssetPath);
	var texImporter = (UnityEditor.TextureImporter)UnityEditor.AssetImporter.GetAtPath(newAssetPath);
	UnityEditor.EditorUtility.SetDirty(texImporter);
	texImporter.SaveAndReimport();
	#endif
	// To get the correct file ID, the texture must be reloaded from the asset path.
	Texture2D.DestroyImmediate(newTex);
	#if UNITY_EDITOR
	return (Texture2D)UnityEditor.AssetDatabase.LoadAssetAtPath(newAssetPath, typeof(Texture2D));
	#else
	return null;
	#endif
	}
	}
	}

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