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Geometry editor: Aligning objects

In the current version of Molflow, it is possible to insert a GEO, TXT or STL file to the current geometry. It is useful if we want to assemble a system from parts that are each represented by a file.

However, snapping the pieces together might be difficult, thus there is a new Facet align option.

To use it, select the object that we want to align.

Then open the Facet align dialog. Upon opening, the selection will be memorized:




Object rotation

You can now select one or more facets, and rotate them by a given number of degrees, around an arbitrary axis:


If you want to use the "define by 2 selected vertex" mode to define the rotation axis, you will have to select two vertices using the vertex selector tool.

Collinear facet detection

When CAD programs export STL files, sometimes they include "null" polygons that have all nodes on a single line. This is a bug of the exporting program, most probably caused by the fact that coordinates can be stored with more precision in the memory than in a file.

For example, the following two polygons are NULL polygons:


  • Point1 (0,0,0)
  • Point2 (1,0,0)
  • Point3 (1,0,0)

This is invalid because point 2 and 3 are on the same coordinates, thus it is not a triangle.

7-zip compression

GEO files can be big. This is partly because they are text files (readable in let's say Notepad), but also because they often contain repetitive information (for example, even a tiny facets with default parameters takes about 20 lines to write).

There is also a problem related to this: sending them by email or sharing over Dropbox might result in the browser interpreting the content (ie. displaying the GEO file as a webpage instead of downloading, the email client putting the file content in the email, etc.).

Good news is, because of this uncompact and repetitive behaviour, they are very well compressible. It is not common to have 2% compression ratio, converting a 100MB GEO file to a 2MB GEO7Z file.


In the Tools / Global Settings menu, you can find a new option: autosave. You can toggle the frequency in minutes, and it is possible to restrict this to only when simulation is running (and when it is assumed that the file save process doesn't interrupt your work).



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