Forums >> Revit Building >> Technical Support >> Exporting topography points from Revit to AutoCad

hlmckinney

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Joined: Wed, Aug 1, 2007
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I have created a topo surface in Revit by manually inserting 3D points.  Is there a process to export those 3D points to a DWG without the TIN surface.  We need to import the points into another program that wants points or contour lines, not a TIN surface.

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WWHub

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Did you try exporting a 3D site view to CAD?  That will give you 3D CAD.

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hlmckinney

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Yes that is what I did.  I need to clarify my initial post.  The export created a polymesh surface in AutoCAD, not a TIN.  I need to be able to isolate the 3D points or convert the polymesh surface to a TIN or 3D topography lines.

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WWHub

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If you have your contours on in the 3D View, they export as well and are seperate from the surface.  Works for me.

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coreed

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A triangulated irregular network (TIN) is a digital data structure used in a geographic information system (GIS) for the representation of a surface. A TIN is a vector-based representation of the physical land surface or sea bottom, made up of irregularly distributed nodes and lines with three-dimensional coordinates (x, y, and z) that are arranged in a network of nonoverlapping triangles. TINs are often derived from the elevation data of a rasterized digital elevation model (DEM). An advantage of using a TIN over a raster DEM in mapping and analysis is that the points of a TIN are distributed variably based on an algorithm that determines which points are most necessary to an accurate representation of the terrain. Data input is therefore flexible and fewer points need to be stored than in a raster DEM, with regularly distributed points. A TIN may be less suited than a raster DEM for certain kinds of GIS applications, such as analysis of a surface's slope and aspect. TINs were first invented by Phil Mellor whilst studying Sociology at University of Edinburgh.

TIN overlaid with contour lines

A TIN comprises a triangular network of vertices, known as mass points, with associated coordinates in three dimensions connected by edges to form a triangular tessellation. Three-dimensional visualizations are readily created by rendering of the triangular facets. In regions where there is little variation in surface height, the points may be widely spaced whereas in areas of more intense variation in height the point density is increased.

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coreed,aia

bmpArchitects,Inc.

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darkconn95

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Hi,

I am trying to perform slope analysis of the site. I have AutoCAD file of the survey that includes elevations (it is not 2d flat).

My first thought was using revit to do analysis; however, it doesnt have this particular function. I found out that AutoCAD 3d MAPS will do. I cannot find any info about how to create topo in 3D MAPS from AutoCAD file, so I created topo in REVIT  then exported back to AutoCAD. I dont think the exported file has enough info to perform analysis, it may has to do with the fact that the surface is not DEM..??? I am not really sure.Does anyone have idea how to do slope analysis from AutoCAD file of the survey??? Any help would be appriciated.

Thank You

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