Animation with moving lifts - slowdown

V-Ray V-Ray for 3ds Max Issues
1

I am doing a bit of test animation of an office that has a couple of moving elevators.

I pre-computed the LC (2000 world samples) in flythrough mode, but with all the components of these lifts (glass/stainless steel/timber/etc) set to not cast any GI.

When I render a frame without the lifts visible, frame time is around 10 minutes. When I render with the lifts visible, render time jumps to around 1.5 hours.

I am using Brute Force and LC, and the lifts themselves are taking up approx 1/6th of the frame.

What is the best way to do this? I am not bothered about GI on the lifts as they are largely reflective and there is a vray sun/sky creating enough light to illuminate them (they are in a glazed atrium)

2

Try to turn off the generate/receive GI options for the lifts.

Best regards,
Vlado

3

What is the difference between doing that and unticking ‘visible to GI’?

4

They do different things… “visible to GI” OFF means that the object will not affect how GI is calculated for other objects - but GI will still be calculated for that object itself (unliess you have turned off the “Receive GI” option).

Best regards,
Vlado