DDD Posted January 21, 2021 Share Posted January 21, 2021 Hi, I am having problem using grading limit, please see attached exhibit. Is there anyway I can tackle this? Thank you. Quote Link to comment
Vectorworks, Inc Employee Tamsin Slatter Posted January 21, 2021 Vectorworks, Inc Employee Share Posted January 21, 2021 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. Quote Link to comment
Vectorworks, Inc Employee bgoff Posted January 21, 2021 Vectorworks, Inc Employee Share Posted January 21, 2021 Set a pad around the tree and set the pad to existing. The site will not modify that area. 1 Quote Link to comment
Vectorworks, Inc Employee Tamsin Slatter Posted January 21, 2021 Vectorworks, Inc Employee Share Posted January 21, 2021 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. Quote Link to comment
Vectorworks, Inc Employee bgoff Posted January 21, 2021 Vectorworks, Inc Employee Share Posted January 21, 2021 Yes I would agree with that. It does work generally for singe trees on a site and for small areas. Quote Link to comment
DDD Posted January 22, 2021 Author Share Posted January 22, 2021 @bgoff Thank you! Quote Link to comment
DDD Posted January 22, 2021 Author Share Posted January 22, 2021 @Tamsin Slatter Thank you! Then what is the common practice to stop the grading at the property line if I also need to place multiple grade limits on site? Quote Link to comment
Jeff Prince Posted January 22, 2021 Share Posted January 22, 2021 @DDD you don’t need multiple grade limits, you just create site modifiers to get the surface you want. Limits just define the extents of the grading, for which there should only be one. Quote Link to comment
Vectorworks, Inc Employee bgoff Posted January 22, 2021 Vectorworks, Inc Employee Share Posted January 22, 2021 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. 2 Quote Link to comment
Vectorworks, Inc Employee Tamsin Slatter Posted January 22, 2021 Vectorworks, Inc Employee Share Posted January 22, 2021 Agreed - multiple grade limits are fine - they just should not touch or intersect. On a huge site, you would not want to modify all of it. Every site modifier should be enclosed within a grade limit, but there can be many site modifiers to one grade limit. 1 Quote Link to comment
Vectorworks, Inc Employee bgoff Posted January 22, 2021 Vectorworks, Inc Employee Share Posted January 22, 2021 Here are some tips and explanations. And the file for you to pick apart and play with. Sample Grading.vwx 3 Quote Link to comment
Tom W. Posted March 16, 2021 Share Posted March 16, 2021 @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 Thanks Quote Link to comment
Vectorworks, Inc Employee bgoff Posted March 16, 2021 Vectorworks, Inc Employee Share Posted March 16, 2021 yes it could. either will work. Quote Link to comment
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