ModelStreamingBehavior completely breaks raycasts from the Mouse.

Bug Reports Engine Bugs
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1

ModelStreamingBehavior set to Improved:
https://youtu.be/VqBzUk_vibM

ModelStreamingBehavior set to Default:
https://youtu.be/Xj1IdTHbARg

Game Link:

System Information:

Screenshot 2025-10-20 at 3.49.34 PM
Screenshot 2025-10-20 at 3.49.34 PM542×990 72.6 KB

Expected behavior

Basically setting the ModelStreamingBehavior to Default breaks raycasts from Mouse completely.
The code has been provided in private content.

A private message is associated with this bug report

4 Likes
2

Can you please provide a simple repro place demonstrating the problem and steps to reproduce the problem? Please don’t share your entire experience. Whatever the minimal instances/scripts needed to reproduce the problem.

See:

1 Like
3

Could be that the model doesn’t get affected by the RayCast because of it. Also, did you opt to the Server Authority devtest? It’s been causing issues for everyone, even me..

1 Like
4

Yea, but I double checked this.

image
image1756×472 47.2 KB

I removed myself from the SLIM and the Server Authority Betas as they were causing more issues. And in the videos & testing in this report I wasn’t in any of betas.

1 Like
5

I have updated the private message with a repro file.

1 Like
6

Please include both a minimal repro and the steps to reproduce the issue. The attached place has a large number of different parts spread around. Are all of them necessary? If you just have your raycast scripts and a single part/model in the world does it still reproduce?

There are no instructions in your report on how to actually reproduce the issue and what the issue actually is.

1 Like
7

The video links I provided have me speaking in them which show case what goes on.

  1. The issue mainly affects the main game with a ton of models which is why it is really hard to give a repro file. Reason why the repro file has so much stuff lying around is because how the (not the best) framework system was made by another dev. So much relies on each other that, if 1 part is removed it just falls apart.

  2. The video links show case how I enabled improved or default and how the engine responded.

  3. Would it be easier to grant Team Create?

8

I still don’t know how to repro the problem for the place file you provided. Every part I hover the mouse over seems to behave the same with or without ImprovedModelStreaming.

We need clear repro instructions like:

  1. Launch game with default model streaming
  2. Walk to the gun cabinet on the left. Hover over it with the mouse. Observe X.
  3. Launch game with improved model streaming
  4. Walk to the gun cabinet on the left. Over over it with the mouse. Observe Y.

Please be very clear on exactly what I need to do with the place file you provided.