From 54bcabc374b438ee288964d6f6314f5da2121a0e Mon Sep 17 00:00:00 2001
From: aura <nw@moneybot.cc>
Date: Thu, 5 Mar 2026 08:25:23 +0100
Subject: calc face center during map compile

---
 src/game/world/bsp.cpp   | 1 +
 src/game/world/bsp.h     | 9 +++++++++
 src/game/world/trace.cpp | 7 +++----
 3 files changed, 13 insertions(+), 4 deletions(-)

(limited to 'src/game')

diff --git a/src/game/world/bsp.cpp b/src/game/world/bsp.cpp
index f5fb0e9..b55593f 100644
--- a/src/game/world/bsp.cpp
+++ b/src/game/world/bsp.cpp
@@ -840,6 +840,7 @@ BSP* bsp_build_map( WORLD_MAP* m ) {
   bsp->root = bsp_build_nodes( bsp, planes, faces, 0 );
   for( U32 i = 0; i < bsp->faces.size; ++i ) {
     bsp_face_calc_extents( &bsp->faces.data[i] );
+    bsp->faces.data[i].center = bsp_face_get_center( &bsp->faces.data[i] );
     bsp->faces.data[i].id = i;
   }
   bsp_gen_leaf_edges( bsp );
diff --git a/src/game/world/bsp.h b/src/game/world/bsp.h
index ac72e14..fbf2a4c 100644
--- a/src/game/world/bsp.h
+++ b/src/game/world/bsp.h
@@ -49,6 +49,7 @@ struct BSP_FACE {
   LIST<VERTEX3D> render_verts{};
   VEC3 mins;
   VEC3 maxs;
+  VEC3 center;
   U32 hitmask;
 };
 
@@ -154,6 +155,14 @@ inline U8 bsp_face_is_axis_aligned( BSP_FACE* f ) {
   return 1;
 }
 
+inline VEC3 bsp_face_get_center( BSP_FACE* f ) {
+  if( !f->verts.size ) return {};
+  VEC3 c{};
+  for( U32 i = 0; i < f->verts.size; ++i )
+    c += f->verts.data[i].pos;
+  return c / f->verts.size;
+}
+
 inline void bsp_face_calc_extents( BSP_FACE* f ) {
   VEC3 mins{ +INFINITY, +INFINITY, +INFINITY }, maxs{ -INFINITY, -INFINITY, -INFINITY };
   for( U32 i = 0; i < f->verts.size; ++i ) {
diff --git a/src/game/world/trace.cpp b/src/game/world/trace.cpp
index 0cd720d..2cf2a81 100644
--- a/src/game/world/trace.cpp
+++ b/src/game/world/trace.cpp
@@ -198,11 +198,10 @@ inline U8 point_in_inflated_poly(
   const AABB& hull,
   const VEC3& norm
 ){
-  VEC3 center{};
   U32 c = face->verts.size;
-  for( U32 i = 0; i < c; ++i )
-    center = center + face->verts.data[i].pos;
-  if( c ) center = center * (1.0f / c);
+  VEC3 center = face->center;
+  if( !c )
+    return 0;
 
   VEC3 hullh = ( hull.max - hull.min ) * 0.5f;
   for( U32 i = 0; i < c; ++i ) {
-- 
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