Mirrored blocks and extrusions

[LeighJ]

I would just like to be able to update all by blocks so these three values are 1, if there is a lisp or similar so I could do it with 1 click this would be perfect.

Leigh

[SEANT]

There may be some routine available, I don’t know for certain.



But, to clarify, which three values are in need of change? A standard WCS entity would have a Extrusion (Normal) vector of 0,0,1



I’ll assume everything in you drawing is coplanar to the WCS’s XY plane – just that some of the 2D references have erratic properties to get the correct 2D placement. If that is correct then I would suggest using that filter showed in my previous post to pre-select all references that are essentially “upside down”. Now, invoke the MIRROR3D command, choosing the “Delete original” option.



Conceivably, you would also like to ensure all scale values are 1.0. Using a new Filter, or the Quick Select feature of the Properties Pallet, select all references that have scales not equal to 1.0. All three X, Y,Z scales can then be reset to 1 in the properties pallet.



Unless the reference geometry is symmetrical, however, the item in question may change visually from their current orientation.

[LeighJ]

I just need to reset the Extrusion (Normal) vector to 0,0,1. Everything is co-planar and just has some erratic properties which screws up external processes we run on the CAD plans.

How would I use the mirror3d? Currently the scale factors are all 1, and need to remain positive.

Sorry if this are foolish questions. I don't do any 3d work, so this is all abit new to me.

[SEANT]

Everything coplanar makes it a simple process. Use the filtering technique mentioned previously, and then start MIRROR3D. Due to the pre selection, only the upside down blocks will be mirrored.



During the command prompts, choose the XY option, pick any arbitrary point on the WCS XP plane, choose YES to delete source object.



The block reference will now have the correct Extrusion (Normal) direction, but will probably have a X scale of -1. Filter for that to reset to 1.

[LeighJ]

Hi Seant, that does it, thanks for your help.

[Patrick Hughes]

If the block is asymetric wouldn't modifying the the extrusion vector from -1 to 1 have the affect of flipping the geometry? Essentially miroring the mirrored copy.

[SEANT]

I made a similar cautionary comment in the last line of post #12. Given certain setups, even that situation may be mitigated - by adding 180 degrees to the Rotation property.

[LeighJ]

Thanks all, yes the blocks get flipped, but the problem blocks seem to be chairs 99% of the time and they are symmetrical so it doesn't causes me too much problems.