From 6190ffecda578bfad28c1c2e0862d6eb5f4cc5a9 Mon Sep 17 00:00:00 2001
From: Magnus Norddahl <dpjudas@users.noreply.github.com>
Date: Tue, 10 Dec 2024 23:12:12 +0100
Subject: [PATCH] Also expand the bbox for the TLAS tree

---
 src/common/rendering/hwrenderer/data/hw_collision.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/common/rendering/hwrenderer/data/hw_collision.cpp b/src/common/rendering/hwrenderer/data/hw_collision.cpp
index 4a2589fdf..17bf10cd8 100644
--- a/src/common/rendering/hwrenderer/data/hw_collision.cpp
+++ b/src/common/rendering/hwrenderer/data/hw_collision.cpp
@@ -257,6 +257,14 @@ int CPUAccelStruct::Subdivide(int* instances, int numInstances, const FVector3*
 	}
 	median /= (float)numInstances;
 
+	// For numerical stability
+	min.X -= 0.1f;
+	min.Y -= 0.1f;
+	min.Z -= 0.1f;
+	max.X += 0.1f;
+	max.Y += 0.1f;
+	max.Z += 0.1f;
+
 	if (numInstances == 1) // Leaf node
 	{
 		TLAS.Nodes.push_back(Node(min, max, instances[0]));