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Occlusion culling - objects disappear when switching LODs

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worstplayer

Post subject: Occlusion culling - objects disappear when switching LODs

Posted: 06.06.2011, 16:58

Joined: 08.06.2010, 14:17
Posts: 63

I know there's supposed to be an one frame delay with occlusion culling, but should objects also disappear for one frame when switching LODs? It doesn't always happen (can't find exact situation that causes it), but when it does it's quite noticeable.

Is this intended, and if so, is there any workaround? (let's say, displaying multiple LODs at once at certain distances?)

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marciano

Post subject: Re: Occlusion culling - objects disappear when switching LOD

Posted: 08.06.2011, 20:37

Engine Developer

Joined: 10.09.2006, 15:52
Posts: 1217

I could imagine that some outdated occlusion information is used when an LOD is switched back. Does putting this into drawMeshes help?

Code:

bool valid = meshNode->_lastVisited[occSet] == Modules::renderer().getFrameID() - 1;
meshNode->_lastVisited[occSet] = Modules::renderer().getFrameID();
            
// Check query result (viewer must be outside of bounding box)
if( valid && nearestDistToAABB( frust1->getOrigin(), meshNode->getBBox().min,

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worstplayer

Post subject: Re: Occlusion culling - objects disappear when switching LOD

Posted: 09.06.2011, 09:38

Joined: 08.06.2010, 14:17
Posts: 63

Yes, it seems to work perfectly now. Thanks.

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