3dsmax 2017 problem with Forest Pack and dissapearing geometry in render vray3.4

[Anonymous]

Hi !
i'm kind of desperate, and I really need any help.
I'm working on 3ds max 2017, using vray 3.4.
First of all I've noticed that after closing 3dsmax there is an error information, despite the fact that everything is saved and closed correctly. I had the same information when I was using 3ds max 2016. 
Recently i've started to learn Forest Pack and honestly every time I try to do anything there is problem that for instance: I have the grass in the preview but than when i render there is nothing showing up in a vray screen and this information comes up that some forest....(printscreen) Or that suddenly after some time working on a model, all the grass and trees disappears and i have to start all over again. When i'm watching tutorials this plugin is so friendly to use and i cannot even once make any visualization with it.
And the third problem is that i have some geometry in the model - simple boxes with basic vraymtl and they are not rendering at all. I have completely no idea why this is happening, is there a problem with a computer, or with a programm itself, or with the plugins ...

I would be so greatful for any advices what is the reason for all this situations and how i can fix this
thanks

[Anonymous · Accepted solution]

It's possible you have too many forest objects in the scene. If there are too many, none of the objects in that forest object will render. There's a couple things you can do to manage the objects in your scene:

   - Enable camera clipping by selecting the camera in the Camera rollout which will only render objects visible to the camera. 

   - Use 'large' presets from the library unless it is close to the camera

   - Increase the units in Density in the Distribution map rollout

   - You can increase the Max items in the Display rollout but typically not recommended

Read more about this issue here:

https://docs.itoosoft.com/kb/forest-pack/some-forest-were-not-built-correctly-in-the-last-render-err...