Thanks for your scene. I can see several issues which are causing the performance troubles. Have to say, that during our tests, we haven't found any troubles regarding Forest Pack
and I hope you'll find my following tips useful to optimize your scene to get better render performance.
First, I should mention that System Units
are not set up properly (your scene is out of scale - it's corresponding to mm
, but set to cm
). This leads you to change values for most of adjustments as for example Global scale
of Forest objects, but also to "boost" your lights multiplier values and so on. I recommend you to always double check units setup as later V-Ray is easier to set up.
Probably the biggest problem is the V-Ray's Subdivisions
settings for Lights, Materials and Brute Force as Primary engine for Global Illumination calculation. All of these are set to 220 Subdivisions
, which as you can double check for example with this DMC Calculator
causes really HIGH samples values.
Feel free to check this "V-Ray Render Optimization" article
about a possible way how to optimize your V-Ray settings. Also, don't hesitate to ask on Chaos Group's forum as I´m sure they'll help you with it.
As a quick workaround to fix subdivision settings for your materials I can recommend you this VRayMat Resampler script
or any similar.
In case of glass materials I don't think the use of Dispersion
is necessary and also I recommend you to uncheck Reflect on back side
as it's modelled as a solid object. I suppose VRayLight007 should be set to Invisible
Hope this helps you a bit and if there will be anything more we can help you with, please let us know. Have a nice day.