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View Full Version : Where is 0,0,0 anyways???

bbapties
2004-06-08, 06:20 PM
Ever since i started messing with acad (95'), I have always wondered where the point (0,0,0) is on the world??

Just a question that bugs me cause I've never really gotten a good answer.

Anyone know?

Ed Jobe
2004-06-08, 06:32 PM
Wherever I'm standing. :razz:
_____
Some people think the world centers around them. :screwy:

Coolmo
2004-06-09, 11:47 AM
Apparently and quite unfortunately, 0,0,0 is usually about 500 feet from whatever civil project the idiots in my office are working on (and usually above the site)

treb
2004-06-09, 02:55 PM
from what I can figure 0,0,0 is sea level in the gulf of Guinea

Maverick91
2004-06-09, 03:34 PM
There ought to be some designation for 0,0,0 other than 'the origin'.

Within your work, it's where ever you put it. I've had a few drawings where the actual design was millions of feet from 0,0,0. It makes for interesting analysis work.

bbapties
2004-06-09, 05:54 PM
why the gulf of guinea, why would the use that as a base point......Even when I tried to convert 0,0,0 into a lat and long I recieved errors from the program i use.....wierd.....its always bugged me....

BrenBren
2004-06-09, 06:01 PM
So nice to work in the Mechanical world...for me, 0,0 (don't need elevations) is usually a corner of a piece of sheet metal some fabricator is going to make for me :-P

scott.wilcox
2004-06-09, 07:24 PM
Depends on the datum and projection you are using.

Zero northing is typically the equator, zero elevation is typically mean sea level.

The zero easting varies depending on the datum. If you are using UTM, 3TM ot 10TM projections, the zero easting is typically the center of the zone, or is applied a nominal value of 500,000 metres, otherwise you will get negative eastings.

Scott

jack.frahm
2004-06-16, 03:07 PM
I work in the mechanical world, so this does not seem to be quite as big an issue as it would be in the civil but I still want to understand. When you are creating a drawing you should be inserting at your WORLD 0,0,0?

How does this effect blocks? Should blocks have their insertion point created at WORLD 0,0,0? Can you move WORLDS 0,0,0 to where ever you want it?

What is the difference between WORLD 0,0,0 and the UCS Point of Origin 0,0,0?

Please enlighten me as to how to navigate in infinite space!

mjfarrell
2004-06-16, 03:20 PM
In Model Space, 0,0,0 is the ORIGIN of the coordinate system (world)
If one has established a User Coordinate System then 0,0,0 is where ever
the user defined it to be.
In paper space 0,0 is the intersection of your inked area limits as defined
for your plot device. So if you alter your inked are limits 0,0 will move on you.

Ed Jobe
2004-06-16, 03:25 PM
How does this effect blocks? Should blocks have their insertion point created at WORLD 0,0,0? Can you move WORLDS 0,0,0 to where ever you want it?
Typically, you draw your block so that it is oriented to 0,0 where you want the insertion point to be. But, technically, the insertion point is determined by the BASE sysvar. By default, this is set equal to World 0,0,0. However, you can change it to whatever you want.

If you WBLOCK a dwg, the block's 0,0 is the same as the current dwg's 0,0. If you choose an insertion point for the block, you are changing that dwg's BASE sysvar.