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Premature / overlapping LOD transitions with Instanced Foliage

This issue effects every mesh asset I've tested with the foliage tool / procedural foliage placement in 4.9. LODs begin overlapping one another at varying distances and transition too soon compared to their static mesh counterparts.

I could see having two LODs briefly drawn together, but the overlapping is persistent. The attached example demonstrates the issue with the BogMyrtleBush_02 asset from the kite demo:

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Product Version: UE 4.9
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asked Sep 04 '15 at 04:01 AM in Bug Reports

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avatar image BobJoel Sep 04 '15 at 04:31 AM

So apparently this is fixed by checking on dithered LOD transitions per material in 4.9. Perhaps the above is the intended behavior but I can't see how this would ever yield acceptable results - it doubles up geometry when your camera is right up close. Would like to that option checked on by default.

If the dithering is too expensive, I would think the "pop in" behavior we had in the past would even be a preferable default.

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This is a bug and will be fixed for 4.9.1. Version 4.7 and 4.8 automatically enabled the dithered LOD transitions for foliage but as we now support them for regular static meshes in 4.9, that broke the previous foliage behavior. The workaround as you mention is to open the material and check the the dithered LOD transitions checkbox.

There's some more detail as to why LOD transitions work this way for foliage and why it's efficient in the bottom of this thread:


Cheers Jack

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answered Sep 04 '15 at 09:32 AM

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