UCS and Data Extraction

[CADdancer]

Hello AUGI Members,

I have placed a block with attributes in numerous locations on a drawing and I am using the Data Extraction function to create a table containing these attributes along with the X and Y coordinate of the insert point of the block.

This works fine as long as I am in the World coordinate system however, many of our projects utilize local coordinate systems and when I have one of these local coordinate systems current and do the Data Extraction the X and Y coordinates reflect the World coordinate values and not the local coordinate system values.

Is there a way to correct this and have the X and Y values of the local coordinate system in the table.....??


Regards,
Vince

[jaberwok]

There is a lisp function TRANS which does this.

People in the programming forums should be able to help with its use.

[irneb]

Uhmmm, not without rewriting something to generate the table. What I'd suggest as a work-around is to use xreffing - then place the block(s) in the xreffed DWG's WCS as if that is the local coordinate system. Then move, rotate and/or mirror the xref in the containing drawing to accommodate the global & local coord differences.

Now you need to place a field code into an attribute of the block. BEdit the block in the new xref DWG. Add a new AttDef, give it a unique Tag name and right-click in the Default box, select Insert Field, Category=Object, Field name=BlockPlaceholder, Property=Position. You can set the attribute Invisible, so it won't display.

BSave & BClose. Then run AttSync on those blocks to have each reference updated with the new attribute. Save and reload into the containing DWG. Now modify the data extract - in the 1st page, click the Settings button, ensure Extract objects from xrefs is checked. On the 2nd page ensure the block-name(s) are checked, you may have 2 blocks named the same - check both. On the 3rd page add the attribute name you included before.

That should give you a column showing the local coordinate's, you can still add the Position X & Y from the Geometry group as this would give the global coordinates. If you need separate columns for the coordinates, then create a separate attribute for X & Y - uncheck the XYZ options as needed when creating the field.

[CADdancer]

Thank You Gentlemen For Your Responses,

What I can determine from what you are saying is the data extraction function in vanilla AutoCAD can only give the X and Y position coordinates relative to the World coordinate system......correct....??

To get coordinate values relative to a specific named UCS that is current on the drawing I would need to utilize one of the two methods you have outlined above (lisp program or complicated X-ref setup method) to obtain those coordinate values.

Seems to me Autodesk should have a toggle or variable, that would allow the user to decide which coordinate system to use when obtaining these values....!


Regards,
Vince

[irneb]

Seems to me Autodesk should have a toggle or variable, that would allow the user to decide which coordinate system to use when obtaining these values....!

That would be nice yes.

[scourdx]

In my office we use 3 method to obtain X & Y coordinate.

1. World coordinate - based on AutoCAD world coordinate system
2. User coordinate - based on user UCS point (will not work with XREF)
3. Object coordinate - based on block insertion and you can freely move the block point.

The best method to set your own local coordinate is to use the Object coordinate. See the attached file.

[ninalinden]

Beautiful!! Thank you.

[kalarpu]

Any Idea? How to replace the existing points in CAD with this block?

[arshiel88]

Any Idea? How to replace the existing points in CAD with this block?

BLOCKREPLACE?

[kalarpu]

BLOCKREPLACE?

Currently, I am trying to extract point data from CAD to use in Revit topography.
DATAEXTRACTION command from AutoCAD higher versions can extract coordinates of point with reference to WCS only.
What I need is coordinates data with reference to UCS instead of WCS for x and y values while i want to keep z values with WCS.
Is there any lisp program to do that?
Please help me.