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BGE Scenegraph and View frustrum culling improvement.

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This commit contains a number of performance improvements for the
BGE in the Scenegraph (parent relation between objects in the
scene) and view frustrum culling.

The scenegraph improvement consists in avoiding position update
if the object has not moved since last update and the removal
of redundant updates and synchronization with the physics engine.

The view frustrum culling improvement consists in using the DBVT
broadphase facility of Bullet to build a tree of graphical objects
in the scene. The elements of the tree are Aabb boxes (Aligned 
Axis Bounding Boxes) enclosing the objects. This provides good
precision in closed and opened scenes. This new culling system
is enabled by default but just in case, it can be disabled with
a button in the World settings. There is no do_version in this
commit but it will be added before the 2.49 release. For now you
must manually enable the DBVT culling option in World settings
when you open an old file.

The above improvements speed up scenegraph and culling up to 5x.
However, this performance improvement is only visible when
you have hundreds or thousands of objects.

The main interest of the DBVT tree is to allow easy occlusion
culling and automatic LOD system. This will be the object of further
improvements.
This commit is contained in:
Benoit Bolsee
2009-04-07 22:14:06 +00:00
parent 486985762a
commit 51b4145841
54 changed files with 991 additions and 152 deletions
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7
source/gameengine/Converter/KX_BlenderSceneConverter.cpp
View File

@@ -267,9 +267,11 @@ void KX_BlenderSceneConverter::ConvertScene(const STR_String& scenename,
Scene *blenderscene = GetBlenderSceneForName(scenename);
e_PhysicsEngine physics_engine = UseBullet;
bool useDbvtCulling = false;
// hook for registration function during conversion.
m_currentScene = destinationscene;
destinationscene->SetSceneConverter(this);
SG_SetActiveStage(SG_STAGE_CONVERTER);
if (blenderscene)
{
@@ -281,6 +283,7 @@ void KX_BlenderSceneConverter::ConvertScene(const STR_String& scenename,
case WOPHY_BULLET:
{
physics_engine = UseBullet;
useDbvtCulling = (blenderscene->world->mode & WO_DBVT_CAMERA_CULLING) != 0;
break;
}
@@ -313,7 +316,7 @@ void KX_BlenderSceneConverter::ConvertScene(const STR_String& scenename,
#ifdef USE_BULLET
case UseBullet:
{
CcdPhysicsEnvironment* ccdPhysEnv = new CcdPhysicsEnvironment();
CcdPhysicsEnvironment* ccdPhysEnv = new CcdPhysicsEnvironment(useDbvtCulling);
ccdPhysEnv->setDebugDrawer(new BlenderDebugDraw());
ccdPhysEnv->setDeactivationLinearTreshold(0.8f); // default, can be overridden by Python
ccdPhysEnv->setDeactivationAngularTreshold(1.0f); // default, can be overridden by Python
@@ -806,7 +809,7 @@ void KX_BlenderSceneConverter::resetNoneDynamicObjectToIpo(){
gameobj->NodeSetLocalPosition(pos);
gameobj->NodeSetLocalOrientation(MT_Matrix3x3(eulxyz));
gameobj->NodeSetLocalScale(scale);
gameobj->NodeUpdateGS(0,true);
gameobj->NodeUpdateGS(0);
}
}
}