LandScape Nanite Tessellation Performance Problem

Development Rendering
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1

Hello,

We are using Tessellation in our Landscape (only in Landscape).

While checking the performance, we discovered some strange behavior.

First case:

1. Set r.Nanite.Tessellation to 0 (turn off tessellation).

2. Point the camera toward the sky.

3. When toggling ShowFlag.Landscape between 0 and 1, there is no performance difference observed in stat GPU.

Second case:

1. Set r.Nanite.Tessellation to 1 (turn on tessellation).

2. Keep the camera pointed toward the sky (same as before).

3. When toggling ShowFlag.Landscape between 0 and 1, there is a large difference in stat GPU (specifically in Nanite VisBuffer).

The screenshot below shows the second case.

For reference, shadows were turned off during measurement.

We’re wondering if this behavior is known or if there’s any explanation for it.

I’m currently using Unreal Engine 5.6.1.

Thank you

[Image Removed]

2

재현 방법

3

Hello,

Thank you for reaching out.

I’ve been assigned this issue, and we will be looking into this performance change with Nanite Landscape Tessellation for you.

4

Hello,

This is a known issue. For more information, please see this ticket, and the bug report it contains:

[Content removed]

Please let us know if this helps.

5

Thank you for your reply. It was helpful. I hope it gets fixed in 5.8.

6

Yes, you can close this ticket. Thank you.

7

Hello,

Thank you for the reply.

Can we now close your case? You can always re-open it if you have additional questions about the same issue.