Fix for materials made null in HDRP backport

Author: Adsito

Assets/MapEditor/Managers/AssetManager.cs

@@ -377,13 +377,37 @@ public static IEnumerator SetMaterials(int materialID)
 					switch (lineSplit[0])
 					{
 						case "Standard":
-							EditorCoroutineUtility.StartCoroutineOwnerless(UpdateShader(LoadAsset<Material>(lineSplit[1]), std));
+							Material matStd = LoadAsset<Material>(lineSplit[1]);
+							if (matStd == null)
+                            {
+								Debug.LogWarning(lineSplit[1] + " is not a valid asset.");
+								break;
+                            }
+							EditorCoroutineUtility.StartCoroutineOwnerless(UpdateShader(matStd, std));
 							break;
+
 						case "Specular":
-							EditorCoroutineUtility.StartCoroutineOwnerless(UpdateShader(LoadAsset<Material>(lineSplit[1]), spc));
+							Material matSpc= LoadAsset<Material>(lineSplit[1]);
+							if (matSpc == null)
+							{
+								Debug.LogWarning(lineSplit[1] + " is not a valid asset.");
+								break;
+							}
+							EditorCoroutineUtility.StartCoroutineOwnerless(UpdateShader(matSpc, spc));
 							break;
+
 						case "Foliage":
-							LoadAsset<Material>(lineSplit[1]).DisableKeyword("_TINTENABLED_ON");
+							Material mat = LoadAsset<Material>(lineSplit[1]);
+							if(mat == null)
+                            {
+								Debug.LogWarning(lineSplit[1] + " is not a valid asset.");
+								break;
+							}
+							mat.DisableKeyword("_TINTENABLED_ON");
+							break;
+
+						default:
+							Debug.LogWarning(lineSplit[0] + " is not a valid shader.");
 							break;
 					}
 					yield return null;
@@ -395,9 +419,6 @@ public static IEnumerator SetMaterials(int materialID)
 
 		public static IEnumerator UpdateShader(Material mat, Shader shader)
 		{
-			if (mat == null)
-				yield break;
-
 			mat.shader = shader;
 			yield return null;
 			switch (mat.GetFloat("_Mode"))
@@ -415,6 +436,7 @@ public static IEnumerator UpdateShader(Material mat, Shader shader)
 						SetKeyword(mat, "_SPECGLOSSMAP", mat.GetTexture("_SpecGlossMap"));
 					mat.renderQueue = -1;
 					break;
+
 				case 1f:
 					mat.SetOverrideTag("RenderType", "TransparentCutout");
 					mat.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One);
@@ -426,6 +448,7 @@ public static IEnumerator UpdateShader(Material mat, Shader shader)
 					mat.EnableKeyword("_NORMALMAP");
 					mat.renderQueue = (int)UnityEngine.Rendering.RenderQueue.AlphaTest;
 					break;
+
 				case 2f:
 					mat.SetOverrideTag("RenderType", "Transparent");
 					mat.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.SrcAlpha);
@@ -437,6 +460,7 @@ public static IEnumerator UpdateShader(Material mat, Shader shader)
 					mat.EnableKeyword("_NORMALMAP");
 					mat.renderQueue = (int)UnityEngine.Rendering.RenderQueue.Transparent;
 					break;
+
 				case 3f:
 					mat.SetOverrideTag("RenderType", "Transparent");
 					mat.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One);