From e6c0836b0901713199d4309c64a922bb201bd55a Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Sat, 25 Apr 2026 10:31:21 +0200
Subject: [PATCH] Revert "Fix Blend Mode on Terrain materials to be unenviable
 due to not implemented"

This reverts commit 641f70d4acb8986c794b7310958ca72a07ebc04b.

Transparent material on terrain is used by terrain brushes and terrain highlight tools in editor.
---
 Source/Editor/Windows/Assets/MaterialWindow.cs   | 11 +----------
 .../Graphics/Materials/TerrainMaterialShader.cpp | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/Source/Editor/Windows/Assets/MaterialWindow.cs b/Source/Editor/Windows/Assets/MaterialWindow.cs
index b051542a1..934cd6594 100644
--- a/Source/Editor/Windows/Assets/MaterialWindow.cs
+++ b/Source/Editor/Windows/Assets/MaterialWindow.cs
@@ -57,7 +57,7 @@ namespace FlaxEditor.Windows.Assets
             [EditorOrder(20), VisibleIf(nameof(IsStandard)), EditorDisplay("General"), Tooltip("Defines how material inputs and properties are combined to result the final surface color.")]
             public MaterialShadingModel ShadingModel;
 
-            [EditorOrder(30), VisibleIf(nameof(ShowBlendMode)), EditorDisplay("General"), Tooltip("Determinates how materials' color should be blended with the background colors.")]
+            [EditorOrder(30), VisibleIf(nameof(IsStandard)), EditorDisplay("General"), Tooltip("Determinates how materials' color should be blended with the background colors.")]
             public MaterialBlendMode BlendMode;
 
             // Rendering
@@ -145,7 +145,6 @@ namespace FlaxEditor.Windows.Assets
 
             // Visibility conditionals
 
-            private bool ShowBlendMode => Domain != MaterialDomain.Terrain;
             private bool IsPostProcess => Domain == MaterialDomain.PostProcess;
             private bool IsDecal => Domain == MaterialDomain.Decal;
             private bool IsGUI => Domain == MaterialDomain.GUI;
@@ -188,14 +187,6 @@ namespace FlaxEditor.Windows.Assets
 
                 // Link
                 Window = window;
-
-                // [Deprecated in 1.12]
-                // Fix old terrain materials to go back into opaque
-                if (Domain == MaterialDomain.Terrain && BlendMode != MaterialBlendMode.Opaque)
-                {
-                    BlendMode = MaterialBlendMode.Opaque;
-                    FlaxEngine.Scripting.InvokeOnUpdate(Window.MarkAsEdited);
-                }
             }
 
             /// <summary>
diff --git a/Source/Engine/Graphics/Materials/TerrainMaterialShader.cpp b/Source/Engine/Graphics/Materials/TerrainMaterialShader.cpp
index 4db4acda1..bb0796234 100644
--- a/Source/Engine/Graphics/Materials/TerrainMaterialShader.cpp
+++ b/Source/Engine/Graphics/Materials/TerrainMaterialShader.cpp
@@ -150,6 +150,21 @@ bool TerrainMaterialShader::Load()
     }
 #endif
 
+    // Support blending but then use only emissive channel
+    switch (_info.BlendMode)
+    {
+    case MaterialBlendMode::Transparent:
+        psDesc.BlendMode = BlendingMode::AlphaBlend;
+        break;
+    case MaterialBlendMode::Additive:
+        psDesc.BlendMode = BlendingMode::Additive;
+        break;
+    case MaterialBlendMode::Multiply:
+        psDesc.BlendMode = BlendingMode::Multiply;
+        break;
+    default: ;
+    }
+
     // GBuffer Pass
     psDesc.VS = _shader->GetVS("VS");
     psDesc.PS = _shader->GetPS("PS_GBuffer");
@@ -170,6 +185,7 @@ bool TerrainMaterialShader::Load()
 
     // Depth Pass
     psDesc.CullMode = CullMode::TwoSided;
+    psDesc.BlendMode = BlendingMode::Opaque;
     psDesc.DepthClipEnable = false;
     psDesc.DepthWriteEnable = true;
     psDesc.DepthEnable = true;