Maya Vray Proxy Viewport issue

[brandon_pollard]

I have hopefully a quick question. I'm rendering a scene for work and it's a big overview shot of a large forest. I used Vray proxies with preview geometry to render the thousands of trees needed. The preview geometry being used is 18 polys a piece per tree. When I hit certain amount of proxies I started to get a lot of lag in my viewport. Since then I've even went back and deleted most of the proxies out of my scene and I'm currently sitting at about 320,000 polys in the scene. It's running a little smoother but still pretty slow. But even when the scene was completely loaded down I had somewhere in the neighborhood of 2-3 million polys showing in my viewport. Normally my rig can handle 5-10 million worth the polys of any regular models in a scene with little to no problem. I was curious what might be causing this and is there anyway to repair it. I can give more specs and images if needed but I was wondering if anybody had any information/reason why this is off the cuff. Any help is greatly appreciated.

My Specs
2 1080 TI GTX GPU's SLI together.
AMD Ryzen Threadripper 1950X 16-Core Processor ~3.4GHz
2 32G TridentZ ram sticks
Windows 10
Maya 2018

[Dimitrina.Milanova]

Hello,
Is it possible to send a scene so we can have a further look into your problem? Also which V-Ray version are you using?

[brandon_pollard]

Hello, I'm using V-Ray for Maya version 3.60.04. I keep getting an error when trying to load a compressed folder with the scene. I'll have to just include it in a google drive link. I'll include both a light and a heavy tree scene. None of the textures for the scene will load as they're connected to a drop box folder. But the folder for the tree proxies will be included. Let me know if this is okay.

[deyan.spirov]

Thank you for the scene, it was helpful.
The main issue seems to be the large number of objects, around 30000 transforms (mostly instances of the proxies I would assume, there's only a few thousand meshes). Maya itself seems to be very slow with that many instances, I'm seeing similar viewport frame rates with just some instances of cubes. The only solution I can offer is to use an instancer, they are optimized to handle a large number of objects.

[brandon_pollard]

Hey thank you for looking at the scene. I really appreciate it. Any tutorial recommendations or advice on best work practices for making vray tree instances?