knowledge fusion, centroid from CSYS

Submitted by quicova@gmail.com on Fri, 07/17/2015 - 03:48
Forums: 
Journaling / NXOpen API

Hello Everyone,

I'm writing a function on knowledge fusion to get the centroid of an object and put it in the expression.

Then if the object changes, the expression values updates.

Now I need some help, I'm trying to modified the function to use a selected CSYS to measure the Centroid.
if I then update the CSYS or the body, the values should update in the expressions.

What I need help on is:
- How to make the selection Filter for CSYS
- how to use it for the centroid

Here is what I have so far:

DefClass: centroid (%nx_application %ui_comp);

(Boolean) %on_solid?: false; # this feature will create an independent solid
(String Parameter) %ask_name: "Centroid"; # feature name
(string) %icon_name: "section_inertia"; # icon in MNT
(Integer) %edit_dialog: ug_invokeClassDialog(self:); # edit feature allowed
(List Uncached) %onObjectHighlight: Centroid:;
(Boolean) %atTimeStamp?: false;

###### Create the interface for user selection ######

### main group of user interface ###
(child) UI_group:{
class, %ui_comp_group;
title, "Body Centroid";
Members, {UI_Select:,UI_Label:,UI_SelectDatum:};
Column, 0;
Group, True;
};

#select solid or a surface body, only 1 item per selection #
(child) UI_Select: {
class, %ui_comp_selection;
Many, False;
Label, "Solid or Surface to Analyse";
Tooltip, "Select the Solid or Surface to analyse";
FilterTriple, {{ 70, 0, 35 },{ 70, 0, 36 }};
};

#user text box for expression names#
(child) UI_Label:{
class, %ui_comp_string;
Value, "";
PresentationStyle, 1;

#select CSYS #
(child) UI_SelectDatum: {
class, %ui_comp_selection;
Many, False;
Label, "Coordinate System";
Tooltip, "Select the Coordinate System";
FilterTriple, {{ 70, 0, 35 },{ 70, 0, 36 }};
};

# make the selected object into the string #
(Instance) object: ug_adoptObject(nth(1,UI_Select:SelectedObjects:));
(Instance) datum: ug_adoptObject(nth(1,UI_SelectDatum:SelectedObjects:));

# Create the expressions with reference to the centroids of X, Y, Z of the solid or sheet selected
# the 'child uncached' allows expressions to be recalculated automatically when geometry changes

(child uncached) x: {
Class, ug_expression;
Name, UI_Label:Value: + "_x";
Value, localX(object:centroid:);
};
(child uncached) y: {
Class, ug_expression;
Name, UI_Label:Value: + "_y";
Value, localY(object:centroid:);
};
(child uncached) z: {
Class, ug_expression;
Name, UI_Label:Value: + "_z";
Value, localZ(object:centroid:);
};

# Creates a Point at the object Centroid
(child) centre_de_gravite_point: {
Class, ug_point;
position, object:centroid:;
};

NXJournaling - Fri, 07/17/2015 - 06:04

Personally, I don't know enough KF to answer your question. Perhaps the other forum members do; however, there have been very few discussions on KF at this forum. If you don't get any response here, you might want to try at the Siemens community forum.

ciao - Sun, 07/19/2015 - 01:22

Looks like the FilterTriple is wrong in your Coordinate System selection. You're using the same one you used to select a solid body, which can't be correct. I can't remember the object type for a CSYS, but that's what you need to put in your FilterTriple.

You'll probably find it hard to get KF help. Not very many people use it, these days.