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Site strip

#1

Could you explain why overlapping site strip depths are accumulated instead of using the approach taken for offsets which prioritise elements lower in the list over those above?

Thank you.
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#2

(09-05-2018, 01:49 PM)Marcus Wrote: Could you explain why overlapping site strip depths are accumulated instead of using the approach taken for offsets which prioritise elements lower in the list over those above?

Thank you.

Hi Marcus,

The logic of the program is that each element is built one after another, rather than subsequent elements being prioritised over earlier ones.

So if you do one platform on top of another the software will build the first platform, then the second.  Since the second may cut into (or fill over) the first it may appear that the second is being 'prioritised' over the first, but that's not really the logic of the program.

In the case of strips, the software creates the first strip, then the second, which will result is the levels being stripped twice.  The difference is that strips are defined by depths below the previous ground levels so the effect is cumulative.  On the other hand platforms are defined by absolute levels, so the platform underneath doesn't affect the levels for the platform above.

Does this make sense?  We have identified that this logic can be difficult, but on the other hand in some situations the ability to build up elements like this is a powerful feature of the program.  We're currently trying to think of ways that we can simplify this logic without compromising the versatility of the program.

Leo
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#3

Thank you, I think I understand.

I often place one platform inside another. For example I could draw out a path and place a house inside it. The path is calculated and then the house (which will have a deeper offset). This saves me having to manually omit the shape of the house from the path (this is what I thought of as "prioritising") and results in the path simply encompassing the building as desired.

I watched your Youtube video on Adjusting Subgrades to Formation and had never considered using site strip in the way you have explained. I am keen to try it. Once you get your head around what is happening I think the software can be a powerful tool.
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#4

(09-05-2018, 07:30 PM)Marcus Wrote: Thank you, I think I understand.

I often place one platform inside another. For example I could draw out a path and place a house inside it. The path is calculated and then the house (which will have a deeper offset). This saves me having to manually omit the shape of the house from the path (this is what I thought of as "prioritising") and results in the path simply encompassing the building as desired.

I watched your Youtube video on Adjusting Subgrades to Formation and had never considered using site strip in the way you have explained. I am keen to try it. Once you get your head around what is happening I think the software can be a powerful tool.


Yes if you haven't already it is worth watching "Understanding Construction Phases & Calculation Order". 

Effectively the Strip element could be called "Reduce Level" and the Spread element "Raise Level" the offsets work slightly differently as they only apply to the element in question.  The strip\spread can be used across multiple elements\ground.
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