OPEN BIM Coordination – Northing and Easting Values in ARCHICAD and REVIT

Decided to re-visit coordinate settings for projects that requires IFC exchange between ARCHICAD and Revit in this blog. In my previous blogs the focus was only on Latitude(Lat) and Longitude(Long). I received some requests to handle Northing and Easting (UTM) as well. To address that I tested the settings of both ARCHICAD and Revit and share the result via this blog.

Before going into how to do the settings we need to understand how both tools work and various coordinate systems available for us to use.

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IFC Export of Migrated/Linked Projects from ARCHICAD 21

Forward migration is usually relatively smooth with ARCHICAD nowadays, but if it’s paired with some hotlinking and IFC export then the new features might cause some confusion.
Two of the latest additions to ARCHICAD are the introduction of Classification Systems and the improved IFC Translator settings, which both provide a lot of opportunities and smart management functions for the user, but during migration+hotlinking+IFC export they will need some extra cautiousness, otherwise the user might get unexpected results. Even though this might not be a mainstream case, we just had a few support issues in Singapore because of this, so let me give a generic explanation, hoping to clear up the confusion as much as possible ­čÖé

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Editable Topography from ARCHICAD to Revit

Recently came accross a situation where the Design Architect need to exchange ARCHICAD model with their project partners. The Main Contractor was using REVIT for their BIM process. So, there was a need for conversion of ARCHICAD model to REVIT model via IFC.

The project has large topography as it was a infrastructure project and all of them were created using Mesh object in ARCHICAD. When the topography was transferred to REVIT via IFC that becomes as a Model In-Place element which can not be edited easily. The Main Contractor requested for Toposurface which can be edited further in REVIT. This article covers the solution on how to re-create an editable Toposurface in REVIT using the data exported from ARCHICAD.


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Rhino – Grasshopper – ARCHICAD Live Connection – Simple Example

In this article I will be focusing on a simple example to demonstrate RH-GH-AC live connection, another wonderful OPEN BIM workflow from GRAPHISOFT. We will start with an input from a ARCHICAD (AC) file and based on that input a set of balconies will be created using Grasshopper (GH) which is running on top of Rhino (RH). There is not much use of RH but we need Rhino to run Grasshopper.

Initial Setup

Make sure all the three applications (AC, RH and GH) were installed along with live connection add-on from GRAPHISOFT running.

Refer to Grasshopper ARCHICAD Live Connection 1.5 User Guide from the following link:

Chapters to focus:

  1. Getting Started
  2. Launch the Applications
  3. Start the Connection
  4. Grasshopper Palette in ARCHICAD

Grasshopper Help

To understand this exercise there is a need for basic understanding of Grasshopper. Please refer to the following links:

Input from AC

  1. In ARCHICAD create a simple building with 10 Story + Roof. Set the Story to Story height as 3000 mm. Create a Complex Profile for the railing as well. Alternatively download the file from the link here.
  2. Use Line tool to draw a line from point P1 to P2, suggest to draw the line in 2nd Storey.
  3. Select the line just drawn using the Arrow tool.


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Tekla Project Base File for the Structural Team

This post is a follow-up of previous post Project Base Files for Coordination. In case the Structural team decided to use Tekla Structures for their BIM authoring then they need a Project Base File in Tekla with setup based on Architectural file.

Architectural Project Base File

Setup the Architectural Project Base File in ARCHICAD and export as IFC file as discussed in the post Project Base Files for Coordination.


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Project Base Files for Coordination – Explanation

This post is to follow up on a request for explanation of each step on the post Project Base Files for Coordination. Let me write this post to further explain the steps.

Why there is a need for Project Base Files?

As mentioned in the post Project Base Files (PBF) are project specific templates in various tools used for BIM authoring.

  • PBF consists of Location, Orientation, Grids and Levels. These information can be based on national standards or agreed settings by the entire project team through BIM Execution Plan (BEP).
  • This is to make sure everyone (BIM Authors) start with the right foot.
  • This will ease the co-ordination process when the models from different BIM authors (disciplines or trades) are┬ámerged together.
  • This is to represent the real world condition of the entire building (including all disciplines) virtually.

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