From 10a8a31520349b24f6bdeb3d6b1f87ff42713431 Mon Sep 17 00:00:00 2001
From: Jarrod Doyle <thejarroddoyle@gmail.com>
Date: Mon, 23 Sep 2024 20:32:47 +0100
Subject: [PATCH] Add light falloff and diffuse angle

---
 KeepersCompound.Lightmapper/Program.cs | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/KeepersCompound.Lightmapper/Program.cs b/KeepersCompound.Lightmapper/Program.cs
index d1fdde7..77a46bf 100644
--- a/KeepersCompound.Lightmapper/Program.cs
+++ b/KeepersCompound.Lightmapper/Program.cs
@@ -1,4 +1,4 @@
-using System.Numerics;
+using System.Numerics;
 using KeepersCompound.LGS.Database;
 using KeepersCompound.LGS.Database.Chunks;
 using TinyEmbree;
@@ -286,7 +286,16 @@ class Program
                             var hit = hitResult && Math.Abs(hitResult.Distance - direction.Length()) < 0.001;
                             if (hit)
                             {
-                                lightmap.AddLight(0, x, y, (byte)light.color.X, (byte)light.color.Y, (byte)light.color.Z);
+                                // TODO: This isn't perfectly accurate, but it's pretty fucking close tbh
+                                var dir = light.position - pos;
+                                var angle = Vector3.Dot(Vector3.Normalize(dir), plane.Normal);
+                                var len = dir.Length();
+                                var slen = len / 4.0f;
+                                var strength = (angle + 1.0f) / slen;
+                                strength = Math.Min(1.0f, strength);
+
+                                var c = light.color * strength;
+                                lightmap.AddLight(0, x, y, (byte)c.X, (byte)c.Y, (byte)c.Z);
                             }
                         }
                     }