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HISM problem with culling

Hi, UE guys, I am new with UE, but have experience with other engines. I began to understand the work of instancing, culling and LOD systems and find some problem and some questions.

1) Find strange behavior of culling for Hierarchical Instanced Static Mesh (HISM) in blueprint. Problem was reproduced in test project. Culling is cuts off geometry which is must be visible. Maybe exist any configurable object bounds for culling, but I not find it.

Culling good

Culling problem

2) HISM scene object -> Details panel(of HISM component) -> Instance End Cull distance This parameter doesn't affect on visibility of scene objects. This parameter did not produce any reaction on culling. missed distance culling

3) I didn't find any possibility add custom params for instance - only transform. Can I get per instance info in material: current LOD, LOD blend factor (on pic. for understand terminology)? It will be also good for setting any custom per params... blend factor

In attach simple project that reproduce problems (open level in: Context -> HISM_Culling) test project

Product Version: UE 4.18
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asked Mar 14 '18 at 03:14 PM in Rendering

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Andrey Bykovskiy
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Problem 1 and 2 not reproduced in UE 4.19 - not actual.

Anyone can get solution on problem 3? Previously we use some per instance customization - this opportunity was very much in demand with us.

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answered Mar 15 '18 at 08:49 AM

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Andrey Bykovskiy
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avatar image Andrey Bykovskiy Mar 15 '18 at 09:18 AM

Find issue 2 as registered bug in tracker https://issues.unrealengine.com/issue/UE-53024 , but I am not reproduce this in test project with 4.19 (target version for bug fixing is 4.20)

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