Itoo Software Forum

Forest Pack => Forest Pro (*) => Topic started by: BH1974 on August 26, 2014, 01:57:19 PM

Title: Horrible rendertime with 1 tree
Post by: BH1974 on August 26, 2014, 01:57:19 PM
Hi all!

I'm testing out a new scene with a forest.
Currently I'm testing only 1 tree but the rendertime goes completely crazy.
It takes more than an hour to make the tree at least recognizable.

I use Forest Pack pro with Laubwerk trees, just a simple chestnut in a 3dsmax with vray 3.0 scene.
Adaptive or progressive AA works just as bad.
I have an overclocked I7 4770 (the latest) with 64 GB of RAM.
That should be no problem right?

The dynamic range limit of the ram in the vray settings is set to 0.

Am I doing something wrong here?

I used to work with C4D and Vray, no problem at all with trees from HD Trees...

Thanks in advance!
Title: Re: Horrible rendertime with 1 tree
Post by: Michal Karmazín on August 26, 2014, 03:40:11 PM

Could you please do a quick test using Forest Tools (to export your scattered geometry to instances)? You can find it under Utilities panel - More... - Forest Tools. Please check this reference ( This way you can check that the problem happens during Forest object conversion or not.

Please compare render times, if there is an significant improvement or not. Thanks in advance.

You can also try to run our Material Optimizer. With this utility you can benefit of improved render times and realistic look only with a single click. To use it open the Materials rollup in your Forest object and press the Optimize Materials button. Anyway, the Laubwerk models shouldn't use filtering on opacity maps or trace reflections.

Feel free to check our Rendering Best Practice ( article where you can find a lot of useful informations.

If you'll be still facing troubles with long render times, would you kindly send us the simplified scene (containing problematic objects) to For large files, please use a web sharing service as WeTransfer or Dropbox.

Kind regards,
Title: Re: Horrible rendertime with 1 tree
Post by: BH1974 on September 11, 2014, 05:21:43 PM

Sorry about the delay in answering your email.

I did my very best together with the peolpe of
This Renderfarm faced the problem they couldn't render my pictures because the threes were not visible...

I tried this renderfarm because I couldn't render it on my own.
Despite the relative small pictures, only 1500x844px, my fast i7-4770 64GB pc with Vray 3.0 and 3DSMAX 2014 jams eveytime after 10-15 minutes of rendertime, with progressive and adaptive render.

I tried your above options but it didn't help.

The pc goes nuts when it is time to render the threes in the picture.

I must be doing something completely wrong, but even the specialists (Rodolphe) from Rendercomputing couold not find out the problem.

I will send you an email via the support contact emailadres and will attach the complete scene via Dropbox.

I really hope you can help me out.
Big big thanks in advance!!!
Title: Re: Horrible rendertime with 1 tree
Post by: Michal Karmazín on September 12, 2014, 12:23:50 PM

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.

Kind regards,