- This page explains how to export vertices and elements from Continuity’s database to portable formats.
Register and Connect to the Database
You will need to download Continuity and register to have access to the database.
- Open Continuity. When the splash screen loads, click “OK”.
- To connect to the database, click “File”, “Library”, and “Search”, as in the image below
- If you have issues connecting to the database, try following the instructions in the following pages:
Selecting a model from the database
- You can scroll up and down, or do a search for a keyword in the model name at the top of the screen to find a model.
- Here, we selected a model (in purple) called “pt68_LA_142”
- Notice the tree widget in the bottom half of the screen. This is where you can export the vertices and elements.
- If there is a “+” next to “Mesh”. Click this “+” and a list of objects should appear underneath.
Export the Vertices
- We refer to the vertices as “Nodes”. Click “Nodes” as indicated in blue letters below.
- A new box (the nodes form) should appear.
- If you want to export the mesh as a linear mesh (i.e., not a cubic Hermite mesh), change the basis functions as indicated by clicking the drop-down menu and changing the basis function from Cubic Hermite to any Linear Lagrange basis (blue highlight) for all three columns: Coordinate 1, Coordinate 2, and Coordinate 3. Even if you want to export a cubic Hermite mesh, you should still probably export as a linear mesh for simplicity, as the derivative information is also present in the “Scale Factors Form”.
- Next, click the button “Import/Export/Graph” along the bottom-left. A table will appear with the information.
- Click “File”, and then “Save”, as highlighted in the image below.
- An Explorer should pop-up, and you will be prompted to save the file. You can save as a “.txt” or “.xls” extension.
Export the elements
- Back at the database screen, under the heading “Mesh”, there should be a subheading “Elements”, as indicated below. Click “Elements”.
- A box (the elements form) should pop-up. It looks like the picture below.
- Click “Import/Export/Graph”
- Another form will pop-up to allow you to export the elements. It appears below.
- When the Explorer pops up, name your file with the extension “.txt” or “.xls”
- The ordering of the four (eight) vertex numbers listed for each quad (hex) adopt a convention to indicate how the vertices are connected. You may refer to the documentation below to see the convention. (Many geometric modeling softwares use a clockwise or counter-clockwise ordering convention, which we do not use because it is less logical in the context of finite elements.)