From dc6f989b13739180da807025bcd9ab567f5c6c8f Mon Sep 17 00:00:00 2001
From: vlj <vljn@ovi.com>
Date: Wed, 24 Sep 2014 00:24:53 +0200
Subject: [PATCH] Do not use matrix inversion for culling

---
 src/graphics/stkscenemanager.cpp | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/src/graphics/stkscenemanager.cpp b/src/graphics/stkscenemanager.cpp
index 7b577b631..4798e92d4 100644
--- a/src/graphics/stkscenemanager.cpp
+++ b/src/graphics/stkscenemanager.cpp
@@ -172,16 +172,14 @@ bool isCulledPrecise(const scene::ICameraSceneNode *cam, const scene::ISceneNode
     if (!node->getAutomaticCulling())
         return false;
 
-    scene::SViewFrustum frust = *cam->getViewFrustum();
-
-    //transform the frustum to the node's current absolute transformation
-    core::matrix4 invTrans(node->getAbsoluteTransformation(), core::matrix4::EM4CONST_INVERSE);
-    //invTrans.makeInverse();
-    frust.transform(invTrans);
+    const core::matrix4 &trans = node->getAbsoluteTransformation();
 
     core::vector3df edges[8];
     node->getBoundingBox().getEdges(edges);
+    for (unsigned i = 0; i < 8; i++)
+        trans.transformVect(edges[i]);
 
+    scene::SViewFrustum frust = *cam->getViewFrustum();
     for (s32 i = 0; i < scene::SViewFrustum::VF_PLANE_COUNT; ++i)
         if (isBoxInFrontOfPlane(frust.planes[i], edges))
             return true;