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Grade Limit Issue (nested grade limit)


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  • Vectorworks, Inc Employee

I'm afraid it's not possible to have nested Grade Limit modifiers. You'll need to reshape the outer modifier so that it doesn't include the root zone for the tree. 
Alternatively, draw a 3D polygon around the tree root zone, and send it to the existing surface and put it in the Site-DTM-Modifier class. This will ensure that although the tree is within the zone that can be modified, the existing levels around it will be transferred to the proposed model.

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  • Vectorworks, Inc Employee
1 minute ago, bgoff said:

Set a pad around the tree and set the pad to existing. The site will not modify that area.

Yes, that too, but a Pad is planar by nature, and the site might not be. That's why I would recommend going the extra mile and using a 3D poly, sent to the surface, so that it picks up the true levels of the site. If you add a Pad, and set it to existing, you run the risk of changing the existing levels.

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  • Vectorworks, Inc Employee

You can define multiple limits per site. I often create limits around the specific item to create the limit to that item. Limits can cross each other, so as they become a series of different shapes entertaining or overlapping I will select all and add surface. This makes for a complex shape over the site as a single limit. Also on large sites I may have multiple separate limits leaving areas untouched.

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  • 1 month later...

@bgoff thank you very much for this I've been meaning to look at it properly since you posted it.

Would you be able to post a 2020 version of the file?

I'm intrigued by the circular pad around the right hand tree in the plan. In my very rudimentary understanding of site modelling I probably would have sought to use a grade limits to 'protect' this tree from site modifications, kind of like @DDD in their original post, but you are using a pad modifier on the existing model instead? This is also confusing because I thought using modifiers on the existing model was discouraged... Could that flat circle around the tree be achieved with a grade limits instead? Just to improve my understanding of these things



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