Force Topo Boundary to follow specific shape

[Base12]

I'm attempting to model a building site which has a sloped, and curved driveway.  I'm trying to model the driveway as it's own toposurface (later I will add retaining walls, etc) and I don't know how to make the toposurface shape stick to the points I define (follow the yellow lines) without making it's own boundary (the areas with the red x's) which basically straight-line connect the end points of the shape.  What is the right way to do this?

[barthbradley]

I could do it.  It'll take planning, but the Toposurface can definitely be shape-edited to meet those requirements/specifications. I've done it numerous times - and with vanilla Revit.

Here, I post this screenshot before on this forum.  Maybe it'll help.  

[mpukas]

@Base12 In your project, IRL your retaining walls TOW and BOW would slope to match the slope of the driveway, so they are a consistent height (i.e. 6', or whatever); the face of the retaining wall would have a slope, determined by the type of wall (boulder, masonry block, concrete); the bench between TOW and BOW would have a slope, usually a 2:1 max, and the benches would also follow the slope of the driveway. 

Relatively common, and easy, for a Civil Engineer that uses Civil3D, but painstaking for OOTB Revit. 

[ToanDN]

- if your driveway is not straight then model a 1:10 sloped ramp for your driveway; if it is a simple straight driveway then you can use a building pad

- grade region and edit points roughly based on the ramp geometry

[mpukas]

@barthbradley thx for the screenshot, but the resolution isn't high enough to read the notes. I kinda get what you did, but can't read it.

[mpukas]

@ToanDN yes, that's generally how I've been doing it since Site Designer went away. And it's difficult and time consuming. 

My point has always been and still is: grading topo by modifying individual point is archaic. Site Designer had two simple tools - Soft Terraina nd Feature Line, borrowed from Civil3D -- that made topo modification much easier, with better results. It also made design development/revisions much easier. 

[barthbradley]

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@mpukas wrote:

My point has always been and still is: grading topo by modifying individual point is archaic. Site Designer had two simple tools - Soft Terraina nd Feature Line, borrowed from Civil3D -- that made topo modification much easier, with better results. It also made design development/revisions much easier. 

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Well then, you've got to be tickled pink with 2024 and Toposolids.  

[Base12]

@mpukas, yes that would be a nightmare!  Fortunately this part of the project is only for conceptualization so the clients can understand 'roughly' how the retaining walls would look.  They won't see underneath the terrain where the walls are 20' tall all the way down to the driveway level!  I'm curious about the Site Designer tools.

[mpukas]

This is a project I did in 2013, when Siteworks was owned by Eagle Point Software, prior to Autodesk buying it and renaming it Site Designer. Doing this in Siteworks/Site Designer was difficult, but easier than modifying points and the results were quite good. 

[mpukas]

@barthbradley why? 

[umut.akparlar]

If you are going to need cut / fill volumes you should use Graded Regions, otherwise no need.

[umut.akparlar]

You need to cut toposolid with preferred shape then edit the points whatever you like with XYZ value

[santosKTG7N]

Split surface is still available, you have to use the split element tool and select your toposolid, then you can draw your region. Unless I'm misunderstanding what you mean by split surface (I didnt work with topography much until 2024)