From 1c35d89eb4c0122b1aa846d021311ad5a2426ff5 Mon Sep 17 00:00:00 2001
From: david <david>
Date: Thu, 25 Jul 2002 17:29:08 +0000
Subject: [PATCH] Fix a problem with the culling of out-of-range random
 objects.  When the triangles containing the objects were out of the view
 Frustum, they were never traversed by ssg (and thus, never culled).  Now,
 every 200 frames, do a pass through the whole scene graph with cull-testing
 disabled and without drawing anything; that will allow random-objects to be
 collected incrementally.

---
 src/Main/main.cxx | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/Main/main.cxx b/src/Main/main.cxx
index 3661968f0..fce651f52 100644
--- a/src/Main/main.cxx
+++ b/src/Main/main.cxx
@@ -647,6 +647,22 @@ void fgRenderFrame() {
         ssgSetNearFar( scene_nearplane, scene_farplane );
 	ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 
+	// This is a bit kludgy.  Every 200 frames, do an extra traversal
+	// of the scene graph without drawing anything and with frustum
+	// culling disabled.  This ensures that out-of-range random
+	// objects that are not in the current view frustum will still be
+	// freed properly.
+	static int counter = 0;
+	if (++counter == 200) {
+				// We disable frustrum testing, so 
+				// the default is fine.
+	  sgFrustum f;
+	  sgMat4 m;
+	  ssgGetModelviewMatrix(m);
+	  globals->get_scenery()->get_scene_graph()->cull(&f, m, false);
+	  counter = 0;
+	}
+
 	// change state for lighting here
 
 	// draw lighting
-- 
2.39.5