Graded Region and Building Pads

[stephenjthomasdesign]

Hi,

I have my existing topography which has building pads on it that are set to existing.  When I use Graded Region it changes the existing pads all to New Construction when it creates the new topography.  When I go back to my existing model there are no building pads when I need the building pads I had to remain there.  They will be demolished in the New Construction phase.  What am I doing wrong?

[barthbradley]

Is this what you are trying to do?

See if this thread helps:

Re: Building pads don't seem to respect phases. - Page 3 - Autodesk Community - Revit Products

If you want, you can post your file here.  I can suggest a workflow after reviewing it.  

[ToanDN]

Select the pad and change its to be created under Existing phase.

[stephenjthomasdesign]

Not quite.  I have an existing house that is going to have the back half demolished.  I have a buildng pad under this house and then I have also used bulidng pads creating the paving at the back of the house.  The new footprint of the back of the house will be larger so I need to add a building pad to this extended area after demolition but need to demolish the paving building pads to make room for the larger house footprint.  Then the backpaving is going to be remodelled so I was intending on putting in new ones to suit the new design.  So, I'm trying to use grade region to allow me to make these changes without affecting the existing model but it is changing all the builidng pads to the new phase to match the new topography.    So in relation to your 3 images, the first would have multiple building pads, the second would have some of those demolished, and the third would have some new ones in their place but with different footprints, levels, and slopes, which is why I can't just alter the existing ones.

[stephenjthomasdesign]

I have tried this but then they don't cut the existing topography which is the same problem I was having in my previous post.

[stephenjthomasdesign]

Here's a file with just the existing topography and the pads.  I've changed the colour of the pads that will be demolished (to red) to allow room for the extension of the house and the re-landscaping of the rear yard.  A new pad will then be added for the extension of the house.  I have not used the graded region function on this file yet so please let me know what the process is to end up with an existing condtions model, and a proposed model.

[ToanDN]

See if this is what you need.

[stephenjthomasdesign]

Not quite, as the building pads are no longer cutting the existing topography.  I need to end up with an existing model with exisitng topography and building pads, and then the new phase to show some of the existing pads and some new ones with the topography modified to suit.

[ToanDN]

What about this?

Left is existing, right is new.

Or do you want the new topo with the existing cut by the red pads but without the red pads?

[stephenjthomasdesign]

Yes, that is what I need, exactly as you have in your image.

But this is what I'm getting so I must be doing something wrong:

Existing model before graded region

Exisitng model after graded region

 

Existing model after graded region and with pads changed back to existing

 

 

[ToanDN]

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@stephenjthomasdesign wrote:

Yes, that is what I need, exactly as you have in your image.

 

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I posted two sets of images.  Which one are you referring to?

[stephenjthomasdesign]

Sorry, the second image wasn't showing up when I replied. The first one is what I need.

[barthbradley]

What is the deliverable supposed to be here.  Are you wanting to remove the red pads and build the blue ones in a future phase and report cut/fill quantities, as well as have separate Views showing what each Phase condition?  Basically, before and after views.  

[stephenjthomasdesign]

The blue pads in your image are the exisitng footprints of the house and the garage that will remain in the model as those buildngs are not being demolished.  I will be adding an additional new pad to the rear of the house for the new extension.  Yes, the red pads will be removed.

[stephenjthomasdesign]

And, yes, views of before and after.

[ToanDN]

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@stephenjthomasdesign wrote:
Sorry, the second image wasn't showing up when I replied. The first one is what I need.

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Take a look at  the attached file.

What I did was:

- copy the existing top + pad next to it, remove the red pads, set the topo to New Construction

- set the old topo and red pads to be demolished under New Construction

- move the new topo back

[barthbradley]

Okay, so basically yes, but reversed.  The existing condition is the blue pads and the new construction is where red pads get built and blue pads get demo'd. 

Is the cut/fill reporting neccessary?  

[barthbradley]

If cut/fill calculations are not needed, then this is a piece of cake. It's all about Phasing (e.g. Phase Created and Phase Demolished). I suspect there is more to it than that.  I need to know what the "more" is.   

If there isn't anything more, then you have two topo conditions: before and after. They don't exist in the same Phase obviously, so Phase out the existing condition in a future phase and replace it with the new condition.  This requires a couple of additional future Phases. 

Anyways, I'll expand based on your feedback.      

[stephenjthomasdesign]

No, both red and blue are existing but the red will be demolished and the blue will stay.  The new pads are not shown as they are not designed yet.  The reporting on this size project isn't really that important but on larger ones it is, so I'd really like to know how to do this correctly.

[stephenjthomasdesign]

Okay so the "more" is that I'm constantly being asked to cut a section here or there to show were the existing ground level is compared to the cut or fill.  Hence wanting to keep the existing topography along with the building pads used to create the flat areas under buildings and paving.  This is only an ideal wish though as I realise it creates problems having an existing and new topography in the same view.  The main thing I need is to be able to go back to that opriginal topography with bulidng pads intact if I need to.

I don't really understand why graded region does not copy these exisiting pads in the same way it copies the topography.  Or am I misinterpreting the use of pads?  My workflow is to create the existing topography with any flat areas under buildings or paving created by using building pads.  I realise I could just put a whole bunch of points in to create these flat areas but this is more time consuming.  Then my intention was to use graded region to create a copy of the topography to modify and add new building pads where required.  Always need to be able to access the original topography with intact original building pads though.