I'm not really familiar with Virtools engine. I've looked over their site and didn't find any information about their terrain rendering. We are also not aware of any of our clients that use Grome with Virtools.
What I can tell you is that Grome can export out-of-the-box to COLLADA and RAW/PNG files so if Virtools supports importing this kind of data you should be able to integrate. You can also go with an additional step by using another program (like 3DS max) which knowns to read COLLADA and write to Virtools format.
But my opinion is to write a direct plugin from Grome to Virtools. Grome comes with a SDK with examples and full documentation. This SDK allows you to write all the Grome scene data into any format.
If you can provide any information (which are not under NDA) about Virtools terrain support we will be more than happy to help you integrate Grome into your pipeline. We are willing to spend a lot of effort to have Grome integrated with as many engines as possible.
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