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Author Topic: Forest of forest of proxy  (Read 4897 times)


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Forest of forest of proxy
« on: December 19, 2017, 02:09:45 PM »

we are trying to make some forest of other forest that instantiate vrayProxy.

Unfortunatly the 2nd forest is broken, looks like it is rendering the mesh of the proxy instead of its content.

Any solution for that ?
FP 5.4.1, 3ds 2017

thanks !


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Re: Forest of forest of proxy
« Reply #1 on: December 19, 2017, 04:45:14 PM »
Hi, it's not possible to use nested Forest objects with proxies, because the inner FP alway is converted to a mesh (an unique level of instantiation is allowed).

But checking your image, in this case you would create a group of several FP objects, and assign it to the main FP.
In this way, each Forest in the group is handled as a separated item, preserving the instatiation.

Note: to assign a group in "Geometry->Custom Object", pick it by name with the Max selector. If not, picking in the viewport will take only one of the FP objects.

Carlos Quintero
iToo Software


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Re: Forest of forest of proxy
« Reply #2 on: December 27, 2017, 11:54:14 AM »
Hi !
I use this thread to ask another question that is really similar to this one.

I am currently making anemone with a forest pack of four variation of one "grass" and created,after that, three variation of this forest pack (using a spline area),
I animated with a wave and noise this first anemone
then I used those three variations in a big forest to put it in my scene and adding another global animation random samples.

So, basicaly, I have one big forest pack with a random sample animation of three little anemone/forest pack with another random sample anomation of four lonely grass with a wave.

In this scene I have multiple forest pack, and only two of them contains forest as custom object, and those two forest do not always render. In some frame there are even only half of the custom object rendered. I am rendering in netywork btw.
I went from 5M poly max to 10, multiplied the max items by 100, and still the same issue.

Do you have any idea of what the problem might be ?

Michal Karmazín

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Re: Forest of forest of proxy
« Reply #3 on: December 27, 2017, 01:06:30 PM »

Though Forest objects can be nested, instancing is applied only on "the top level" and such set-up can be very resources demanding as any "inner objects" are being converted to meshes. In case of having "the inner object" with many polygons, the Display > Max.Faces limit (5 M faces by default) might be reached.

I would suggest you set the "nested" Forest object to Display > Render > Mode: Meshes. Also, since the Forest Pack Pro/Lite 5.0.5 "All scattering limits (Distribution > Max.Density, Display > Max Items/Faces) can be disabled by setting the value to zero." - this way you can discard influence of these limits.

If prefered, it's possible to set them from Maxscript in the following way:

$.maxdensity = 0
$.vmaxitems = 0
$.rmaxitems = 0
$.maxfaces = 0

Hope that helps and big thanks in advance for any additional feedback.

Best regards,


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Re: Forest of forest of proxy
« Reply #4 on: December 27, 2017, 04:02:50 PM »
Thanks a lot Michal for the quick answer. It worked ! :)