From e75ca148c0aaa5e5cd9f68b6ed96ecbb104d7806 Mon Sep 17 00:00:00 2001
From: "W2.Wizard" <leon.delahamette@hotmail.de>
Date: Sat, 30 Jan 2021 23:21:41 +0100
Subject: [PATCH] Added blackbody

---
 Source/Editor/Surface/Archetypes/Material.cs    |  6 +++++-
 .../MaterialGenerator.Material.cpp              | 17 +++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/Source/Editor/Surface/Archetypes/Material.cs b/Source/Editor/Surface/Archetypes/Material.cs
index f8fc025a8..ceb9921cb 100644
--- a/Source/Editor/Surface/Archetypes/Material.cs
+++ b/Source/Editor/Surface/Archetypes/Material.cs
@@ -805,9 +805,13 @@ namespace FlaxEditor.Surface.Archetypes
                 Description = "Simulates black body radiation via a given temperature in kelvin",
                 Flags = NodeFlags.MaterialGraph,
                 Size = new Vector2(120, 25),
+                DefaultValues = new object[]
+                {
+                    0.0f,
+                },
                 Elements = new[]
                 {
-                    NodeElementArchetype.Factory.Input(0, "Temp", true, typeof(float), 0),
+                    NodeElementArchetype.Factory.Input(0, "Temp", true, typeof(float), 0, 0),
                     NodeElementArchetype.Factory.Output(0, string.Empty, typeof(Vector3), 1),
                 }
             },
diff --git a/Source/Engine/Tools/MaterialGenerator/MaterialGenerator.Material.cpp b/Source/Engine/Tools/MaterialGenerator/MaterialGenerator.Material.cpp
index d851e4b86..34ed16d9a 100644
--- a/Source/Engine/Tools/MaterialGenerator/MaterialGenerator.Material.cpp
+++ b/Source/Engine/Tools/MaterialGenerator/MaterialGenerator.Material.cpp
@@ -435,6 +435,23 @@ void MaterialGenerator::ProcessGroupMaterial(Box* box, Node* node, Value& value)
         // Blackbody
     case 35:
     {
+        const auto temperature = tryGetValue(node->GetBox(0), node->Values[0]).AsFloat();
+
+        // Value X
+        auto x = writeLocal(ValueType::Float, String::Format(TEXT("56100000.0f * pow({0}, (-3.0f / 2.0f)) + 148.0f"), temperature.Value), node);
+
+        // Value Y
+        auto y = writeLocal(ValueType::Float, String::Format(TEXT("{0} > 6500.0f ? 35200000.0f * pow({0}, (-3.0f / 2.0f)) + 184.0f : 100.04f * log({0}) - 623.6f"), temperature.Value), node);
+
+        // Value Z
+        auto z = writeLocal(ValueType::Float, String::Format(TEXT("194.18f * log({0}) - 1448.6f"), temperature.Value), node);
+
+        // Final color
+        auto color = writeLocal(ValueType::Vector3, String::Format(TEXT("float3({0}, {1}, {2})"), x.Value, y.Value, z.Value), node);
+        color = writeLocal(ValueType::Vector3, String::Format(TEXT("clamp({0}, 0.0f, 255.0f) / 255.0f"), color.Value), node);
+        color = writeLocal(ValueType::Vector3, String::Format(TEXT("{1} < 1000.0f ? {0} * {1}/1000.0f : {0}"), color.Value, temperature.Value), node);
+
+        value = color;
         break;
     }
     default: