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Site Modifiers - allow Existing + Proposed to cross



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This seems useful

Eg move a roadway by half its width or place a retaining wall to fill over over a driveway, or put a swale in a buried culvert, or draw new contours creating terrain over or under Existing site mod features. etc, etc


Worthy wish, but how implement? Just throwing some ideas or critiques: 

 — Existing site mod can be simultaneously present in two states: a) a thing that modifies the exist site model and b) a thing that can also be modified by one or more Proposed modifiers?


— when Proposed mods are introduced they vitiate/undo effects of Existing mods in Proposed views, but not in Existing views, so that the Proposed mod is acting on the unmodified Existing condition?


— or other???


Not much visual difference in those ideas, but might have different implications for cut/fill and other data? What about indications of demolition or of existing elements that remain in form of abandoned, buried or exposed objects.


The wish needs to be filled out with details of how the feature could act, how a user would provide input, . . . . A basic roadmap for engineering 



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