Re: SolidWorks for Architectural Work?

On Sun, 11 May 2008 12:48:48 -0700, "John R. Carroll"
<jcarroll@[EMAIL PROTECTED]
> wrote:

>Cliff wrote:
>> On Sat, 10 May 2008 11:25:19 -0700 (PDT), zxys <paul@[EMAIL PROTECTED]
> wrote:
>>
>>> The negative.. for large 1:1 layouts,.. parasolid has a 1km limit.
>>
>>   Metric software?
>
>Parasolid has always imposed a limit to the size of the model space
Cliff.
>It's gotten larger over the years but is still there.

  Precision (limits) should be in database units but I'd think but they
probably chose metric (default for limiting factor units) as 1 mm is 
smaller than 1".
  Then they can convert back & forth but never exceed their chosen 
limits in either system.
  I'd also think that the real limit is a power of 2 (and is
based/related to floating point word size, IOW 32 bits).
  As numbers in computers get larger (or smaller than 1)
the distance between any two numbers that can be represented
grows larger so more error can creep into calculations & results.
  There are largest and smallest possible floating point numbers
(absolute value other than zero) as well as integers. The next
smallest number for floats is quite some "distance" from the 
largest.
  All depends on word size (bits) & where they are using the
decimal point. But these days we mostly use IEEE 32 bit math 
(as default) ..
-- 
Cliff