TCL: how to translate coordinates from a system to another?

Stéphane Combet

Hello,

Being new to tcl, I manage to get coordinates of grid selected by user with *createmarkpanel and hm_nodevalue.

What about translating coordinates in another coordinate system? Is that implemented in a given function or should I write a script for that?

Thank you!

 

Michael Herve

Hello again @Stéphane Combet,

Do you want to apply translation of a node selection along the axis of a user-defined system?

If so, *translatemark request a vector. You can retrieve the command to create this vector from command.tcl.

Then for getting the direction of the system, you may query for system attributes through hm_getvalue

The attributes for a given entity can be retrieved in online help (search for data name) or from Matrix Browser, see below an exemple (for materials) from 6:30:

https://youtu.be/OGRMJLunkrs?si=lW8srqNsmJUlRhBB

Does it help?

Michael

Stéphane Combet

Michael Herve_21439 said:

Hello again @Stéphane Combet,

Do you want to apply translation of a node selection along the axis of a user-defined system?

If so, *translatemark request a vector. You can retrieve the command to create this vector from command.tcl.

Then for getting the direction of the system, you may query for system attributes through hm_getvalue

The attributes for a given entity can be retrieved in online help (search for data name) or from Matrix Browser, see below an exemple (for materials) from 6:30:

https://youtu.be/OGRMJLunkrs?si=lW8srqNsmJUlRhBB

Does it help?

Michael

Thank you Michael,

Not sure this helps. What I want is not to move the node. But a given node being placed at (0,0,0) in global coordinate system, if I have another rectangular system placed at (1,1,1) parallel to the global one, the coordinates of the very same node are (-1,-1,-1). 

I wonder if there is a function to get those coordinates of a node in such another system (my case being obviously more complex with systems not parallel to global one).

If not, I will have to code myself the formulas. Feasable, but so boring...

Michael Herve

Stéphane Combet said:

Thank you Michael,

Not sure this helps. What I want is not to move the node. But a given node being placed at (0,0,0) in global coordinate system, if I have another rectangular system placed at (1,1,1) parallel to the global one, the coordinates of the very same node are (-1,-1,-1). 

I wonder if there is a function to get those coordinates of a node in such another system (my case being obviously more complex with systems not parallel to global one).

If not, I will have to code myself the formulas. Feasable, but so boring...

Hello again @Stéphane Combet ,

 

if you want node coordinates in a user defined system, first you need this user system to be assigned to your nodes. This way, you can use the following command:

 

set localX [hm_getvalue node id=$NodeId dataname=localx]

set localY [hm_getvalue node id=$NodeId dataname=localy]

set localZ [hm_getvalue node id=$NodeId dataname=localz]

 

Is it what you are looking for?

 

Best Regards,

Michael Herve

 

Stéphane Combet

Michael Herve_21439 said:

Hello again @Stéphane Combet ,

 

if you want node coordinates in a user defined system, first you need this user system to be assigned to your nodes. This way, you can use the following command:

 

set localX [hm_getvalue node id=$NodeId dataname=localx]

set localY [hm_getvalue node id=$NodeId dataname=localy]

set localZ [hm_getvalue node id=$NodeId dataname=localz]

 

Is it what you are looking for?

 

Best Regards,

Michael Herve

 

Thank you! Ok so I could:

1. assign the user defined system to the node
2. use the command you gave me to obtain coordinates in user defined system
3. re-assign previous system to the node

I will look for a command to assign a system to a node.

Michael Herve

Stéphane Combet said:

Thank you! Ok so I could:

1. assign the user defined system to the node
2. use the command you gave me to obtain coordinates in user defined system
3. re-assign previous system to the node

I will look for a command to assign a system to a node.

Hello @Stéphane Combet ,

 

your process is correct.

 

You should be able to use these commands:

*createmark nodes 1 selection_method

*systemsetanalysis nodes 1 $systemid

 

Then to reset you can use: 

*createmark nodes 1 selection_method

*systemsetanalysis nodes 1 0

 

 

Regarding the attributes to query for local coordinates, I need to apologize, here are the correct syntax (I just tested it back this morning):

set localX [hm_getvalue node id=$NodeId dataname=x]

set localY [hm_getvalue node id=$NodeId dataname=y]

set localZ [hm_getvalue node id=$NodeId dataname=z]

or

set LocalCoords [hm_getvalue node id=$NodeId dataname=localcoordinates]

In this second case you get a list with x y and z coordinates.

 

Best Regards,

Michael