The frame rate of large models is lower than before

[wwjje]

The frame rate of large models is lower than before. The previous version had 60 frames per second, but now it only has a frame rate of 20-30 frames per second

[mavimaec]

Thanks for reporting this - looking into it!

[wwjje]

May I ask when this issue can be resolved? The performance and frame rate are not as smooth as before when using large models

[mavimaec]

Hi wwjje, @vim-sroberge is currently working on a fix. Hoping to have it merged in the next few days.

[vim-sroberge]

Hi wwjje, The new release 0.39.0 includes performance improvements.
If you need maximum performance you can also consider using a material override like this

vim.scene.material = viewer.materials.simple

[wwjje]

Hi，I tried it out，The frame rate has increased to around 40FPS, but still hasn't reached 60FPS. During use, there may be a slight lag and lack of smoothness when zooming in, out, or rotating. I tried another version (https://github.com/vimaec/vim-webgl-viewer/tree/v1.5.2) again, and no matter how I operate it, zoom in, zoom out, or rotate, it always has a full frame rate of 60FPS. Why is that?

[wwjje]

I used the same computer and the same large model for testing. You can also test it. vim-webgl-viewer v1.5.2 performs very smoothly, always running at a full frame rate of 60FPS

[vim-sroberge]

I will look into it and try an older version. Thanks for the details.

[wwjje]

May I ask what the reason is? Is it easy to fix?

[vim-sroberge]

You can greatly improve performance by using FrontSide rendering only instead of Two-Sided.
Especially the standard transparent material.

It can cause visual artifacts for some geometry.
It causes missing surfaces when using the section box as well.
But it is much faster.

You can change it at run time with
viewer.materials.transparent.material.side = 0

There are now plans to add this option to the settings UI.

[wwjje]

Yes, I did make the modifications much faster. Will the impact be significant after the modifications? What is VIM Ultra? I can't run it to check, it seems to be missing the address of the server's websocket

[mavimaec]

@wwjje VIM Utra is part of the VIM Desktop application. It allows you to stream our Vulkan-based renderer from your local machine into your web browser. Here is our documentation for VIM Ultra. We use it with our Power BI custom visual to render the largest BIM models.