SEANT Posted January 7, 2009 Posted January 7, 2009 Move the center of the bottom circle to #0,0,0 it will then work. This makes a good case to avoid Millimeters as Drawing Units while modeling architecture in AutoCAD. Quote
JD Mather Posted January 7, 2009 Posted January 7, 2009 This makes a good case to avoid Millimeters as Drawing Units while modeling architecture in AutoCAD. Uhmm, doesn't most of the world work in mm? The OP is in UK. Quote
spursnutter Posted January 7, 2009 Author Posted January 7, 2009 This makes a good case to avoid Millimeters as Drawing Units while modeling architecture in AutoCAD. As the poster above mentions, I am in the UK and we have been used to using Metric for the last 25 to 30 years. Metric units are widely used around the world for personal, commercial and scientific purposes. So it is impossible for us to work in anything other than Metric. What I still don't understand is why it still had to be move from where it was to 0,0,0? Quote
SEANT Posted January 7, 2009 Posted January 7, 2009 Uhmm, doesn't most of the world work in mm? The OP is in UK. That is my understanding as well. And, as your answer earlier in this thread points out, the reduced floating point precision of AutoCAD solid modeler will lead to various problems if the units aren’t appropriate for the scale. Given that AutoCAD will not extrude any distance beyond 100000, regardless of it’s proximity to the WCS origin, the use of meters as a drawing unit for projects at the architectural scale seems sensible. Quote
SEANT Posted January 7, 2009 Posted January 7, 2009 As the poster above mentions, I am in the UK and we have been used to using Metric for the last 25 to 30 years. Metric units are widely used around the world for personal, commercial and scientific purposes. So it is impossible for us to work in anything other than Metric. What I still don't understand is why it still had to be move from where it was to 0,0,0? Metric, no problem . . . Millimeters may be problematic. Floating point precision problems are a fact of life for AutoCAD, or any CAD software. It is why strange things can happen when geometry is a great distance away from 0,0,0 WCS. The Solid Modeler in AutoCAD uses a reduced level of precision (standard geometry uses double precision floating point) thus the anomalies tend to manifest themselves at smaller Origin offsets. Ideally, the level of precision should be allowed to spread evenly to both sides of the decimal. Quote
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