highlight/identifying origin axes stl file

[spodus]

Bye to all,

for my thesis work I take care of the aerodynamic analysis of a pantograph for high-speed trains. the software I use for fluid dynamic modeling is an opensource cfd called openfoam. As for geometry, I was switched to stl format as openfoam requires geometry this type of format. now my problem is as follows: I have to identify (for the reduction of the forces and aerodynamic moments..) the position of the origin of the axes in the geometry in stl format that has been passed to me. I learned how to read a stl file in the cat, but I don't know how I can highlight the location of origin and distances from edges and/or particular features to be able to identify it and locate it in my modified model.

thanks to anyone who is willing to dedicate part of his precious time to help me solve this problem that unfortunately is stealing too much from me.

♪

 

[gianni55]

Hello, luca.

1) the model you received in stl you have to change it?

2) Have you already modified it and in what format?

3) Do you need to change it in caia and generate the axes you need?

If we consider point 3), you have to do some sort of reverse engineering of the sl and create axes, lightning etc. Then: if by origin of axes you mean point x=0, y=0, z=0, you can simply create a point with those coordinates to locate it in your geometry

if you mean instead axes relative to points of fulcrum present in figure etc. You must somehow recreate them, e.g. identifying 3 points that pass through the affected circumference, build a circle that passes through the 3 points, locate its center and so on until recreating the axes

the fact is that positioning points on the stl is feasible after a reverse and could be complicated.

Give me some more information...

Let me know.

Hi.

years ago

 

[spodus]

Hello, luca.

1) the model you received in stl you have to change it?

2) Have you already modified it and in what format?

3) Do you need to change it in caia and generate the axes you need?

If we consider point 3), you have to do some sort of reverse engineering of the sl and create axes, lightning etc. Then: if by origin of axes you mean point x=0, y=0, z=0, you can simply create a point with those coordinates to locate it in your geometry

if you mean instead axes relative to points of fulcrum present in figure etc. You must somehow recreate them, e.g. identifying 3 points that pass through the affected circumference, build a circle that passes through the 3 points, locate its center and so on until recreating the axes

the fact is that positioning points on the stl is feasible after a reverse and could be complicated.

Give me some more information...

Let me know.

Hi.

years ago

thanks gianni for the quick answer.

the concept is that I do not need to change a stl file but I care to know how the origin of the axes is placed (x=0 , y=0, z=0 ) in order to be able to identify it as coordinates and identify it in my reference system.
to make you understand better I make an example: let's say that the parallelepiped is my stl surface, at this point I have to identify the origin in which the coordinates of the stl triangles are written which is placed randomly within the parallelepiped (point p ). Later, by measuring in some way the xp, yp distances, zp from the edges of the parallelepipedo will be possible to identify in my system of reference the old origin. find below the image depicting the example. I hope I've been clearer!

 

[gianni55]

try this way:

create a new part
start digitized shape editor
Enter import menu (and import the first stl) (with random origin)
Enter import menu (and import the second stl) (with origin of your reference system)

at this point in the part 2 stl should be placed differently

then:

menu insert wireframe point and insert a point on a edge of the first ( insert coordinate point then click on the edge) and you will see the coordinates appear compared to the origin (where are the plans xy, yz, zx) and write the coordinates

insert a point on the corresponding edge of the second and you will see the respective coordinates appear compared to the origin and write those

with the appropriate difference you should be able to identify the differences between new origin and the old.

Let me know.

Hi.

years ago

 

[spodus]

try this way:

create a new part
start digitized shape editor
Enter import menu (and import the first stl) (with random origin)
Enter import menu (and import the second stl) (with origin of your reference system)

at this point in the part 2 stl should be placed differently

then:

menu insert wireframe point and insert a point on a edge of the first ( insert coordinate point then click on the edge) and you will see the coordinates appear compared to the origin (where are the plans xy, yz, zx) and write the coordinates

insert a point on the corresponding edge of the second and you will see the respective coordinates appear compared to the origin and write those

with the appropriate difference you should be able to identify the differences between new origin and the old.

Let me know.

Hi.

years ago

I have the coordinates I need! !

Thank you very much, really!
Good day,

♪