How to extract geometry from CGR

How to extract geometry from CGR model in CATIA V5?

In case you would like to extract geometry from cgr file you cannot use common tools. CGR (Catia graphics representation) file only presents the outer surface of a part or assembly. This surface is tessellated (consist only of triangles). This format is only for representation. You can use it for clash analysis, measure distances between elements, etc.

How to solve this situation? Use tool Measure Between.

First of all, insert cgr file into any Product (it is not possible to open cgr file separately). Insert also a new part.

how to extract geometry from cgr model

 

If you want to extract a points, then select tool Measure Between.

how to extract geometry from cgr model

 

Then measure distance between two edges. Select an option create geometry.

how to extract geometry from cgr model

 

Geometry creation window will appear. Select an existing one option and select Part1. If you will select option Create a new CATPart under, then you can skip new part including in the beginning. 

how to extract geometry from cgr model

 

After pressing OK, info window will pop-up. Then just click OK.

how to extract geometry from cgr model

 

Afterward creation of Geometry window will appear. Here you can choose, what you want to extract. If you will select point, CATIA will create point (one for each edge). In case you will select line, CATIA will create line.

how to extract geometry from cgr model

 

Selected option Line (orange highlighted, without history – no parents and children):

how to extract geometry from cgr model

 

Difference between Measure Between and Measure Item.

There is also other option how to extract points. You can use tool Measure Item. Advantage of this option is that you can extract two points from one line. 

how to extract geometry from cgr model

 

Process is same. Measure one edge and create geometry. Then Create First Point and Second point. CATIA will create points on the imaginary line (selected edge).

how to extract geometry from cgr model

how to extract geometry from cgr model

 

Extracted two points without history – no parents and children:

 

Even though you can extract only points and lines, you can use them to create any reference surfaces, hole axis, arc center, etc. for your work.

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