topic Re: Precision in Modeling

Precision

Vojtech Slavik — Thu, 17 Jun 2021 11:56:00 GMT

Does anyone know why this happening ?

Where it became this 1 millimetre from 32000mm ?

Can I lock measures for be precise for Integer number ?

Re: Precision

Anonymous — Thu, 17 Jun 2021 15:04:43 GMT

AC has maximum 4 decimals after the comma. Sometimes I copy/paste dimension from a calculator. If the pasted dimension has more then 4 decimals, then AC will display only 4. But the rest of the dimension is stored in the parameter and you won't see it. Then with cumulative dimensions it will appear like your situation. Try to reenter the exact dimensions and see if the problem persist.
Hope this helps.

Re: Precision

Vojtech Slavik — Thu, 17 Jun 2021 16:19:14 GMT

I understand but Why is this exist if I can see it or who is need in Architecture 0,001 mm ?

This was example and I did whole building and the end I got this 1mm from somewhere, also the snapping on 89,99 make me crazy 😕

Isn't any way how to lock for integer ? I wanna trust Archicad for helping me with guide lines and not writing every dimension 😕

Thank you

Braza wrote:
AC has maximum 4 decimals after the comma. Sometimes I copy/paste dimension from a calculator. If the pasted dimension has more then 4 decimals, then AC will display only 4. But the rest of the dimension is stored in the parameter and you won't see it. Then with cumulative dimensions it will appear like your situation. Try to reenter the exact dimensions and see if the problem persist.
Hope this helps.

Re: Precision

Anonymous — Thu, 17 Jun 2021 16:39:54 GMT

You can set your dimension preferences in Options > Project Preferences > Dimensions.
You can find more information here: https://helpcenter.graphisoft.com/user-guide/89377/
You also can set snapp guides here: https://help.graphisoft.com/AC/24/INT/_AC24_Help/030_Interaction/030_Interaction-51.htm
But you have to be careful when you copy/paste dimension values.
Hope this helps.

Re: Precision

DGSketcher — Thu, 17 Jun 2021 21:12:07 GMT

A cautionary tale on rounding. If you are displaying integer values and you have two lengths of 10.4mm, then those dimensions will round down to 10mm, but if you dimension end to end that will be 20.8mm and the displayed value will be 21mm. This isn't an Archicad specific issue, it is common to all CAD systems. The best solution is to work from the extents before measuring to the subdivision and be accurate with your length AND orientation. AC seem to be quite good at suggesting guide lines which are just off orthogonal these days.

Personally I have two dimension settings, one which shows maximum accuracy to highlight any sub integer errors when modelling and another only show integer values which is the one used with my view settings.

Re: Precision

Vojtech Slavik — Fri, 18 Jun 2021 06:50:09 GMT

But can I see in Tracker 0,001 value ? Right now I can se just integer.

The rounding is true how you say.

My workflow is like do one wall with length ( 5000) and the other wall is following to the first wall and I expecting to have the same measure 5000.

If I did mistake and the first wall was 5000,8=> 5001 I get the another wall also 5001. It's much easer to fix this issue than have one of the walls 5000 and other 5001 ( because you don't know with one is wrong.

Anyway thanks for advices 🙂

I have to read it again and try to little bit more understand Guidlines

Re: Precision

Vojtech Slavik — Fri, 18 Jun 2021 07:15:23 GMT

I still don't get it, where is the 1mm from 32 00(1)

Re: Precision

Anonymous — Fri, 18 Jun 2021 09:01:32 GMT

Well... The image proves that the dimensions and rounds are correct. (Only higher than 0.5mm adds 1mm to the dimension). The problem is in the input. Again: You have to precisely enter all your dimensions.

Re: Precision

Barry Kelly — Fri, 18 Jun 2021 09:02:33 GMT

20000.4 will round to 20000
12000.4 will round to 12000

But end to end they will measure 32000.8 which will round to 32001

You can show extra accuracy in your dimension preferences and you can also increase the accuracy of the working unit preferences, so you will see more precision in the tracker.

Barry.

Re: Precision

Vojtech Slavik — Fri, 18 Jun 2021 09:08:54 GMT

Nice you are right I have exactly 20000.4 and 12000,4 ( How did you know that is this number )
And I can see decimals finally "working unit preferences"

Nice thank you

Barry wrote:
20000.4 will round to 20000
12000.4 will round to 12000

But end to end they will measure 32000.8 which will round to 32001

You can show extra accuracy in your dimension preferences and you can also increase the accuracy of the working unit preferences, so you will see more precision in the tracker.

Barry.

Re: Precision

Barry Kelly — Fri, 18 Jun 2021 09:13:50 GMT

Vojtech wrote:
Nice you are right I have exactly 20000.4 and 12000,4 ( How did you know that is this number )

Lucky guess.
I will be putting in my lotto numbers tonight!

Barry.

Re: Precision

Laszlo Nagy — Sat, 19 Jun 2021 18:01:05 GMT

Vojtech wrote:
Can I lock measures for be precise for Integer number ?

You can go to the "View > Grid & Editing Plane Options > Grids & Background" Dialog, and there set the Snap Grid to 1 mm for both X and Y direction. Then turn ON the "View> Grid Snap" toggle.

There is one caveat though: you will snap to the Snap Grid even if you are drawing non-orthogonally. In that case, you should input distances and angles accurately using the Tracker to get the result you want, otherwise, Archicad will snap to the Snap Grid, which can cause slight inaccuracies in placement.
So, the use of the Snap Grid offers the most advantages when creating orthogonal geometries.

Actually, there is another caveat, too: the smart cursor will not find element nodes and edges unless they fall exactly on the Snap Grid. In that case, you again have to turn off Grid Snap to find those element nodes/edges.

Re: Precision

Vojtech Slavik — Mon, 21 Jun 2021 09:15:07 GMT

Thanks this is such good idea 

LaszloNagy wrote:

Vojtech wrote:
Can I lock measures for be precise for Integer number ?

You can go to the "View > Grid & Editing Plane Options > Grids & Background" Dialog, and there set the Snap Grid to 1 mm for both X and Y direction. Then turn ON the "View> Grid Snap" toggle.

There is one caveat though: you will snap to the Snap Grid even if you are drawing non-orthogonally. In that case, you should input distances and angles accurately using the Tracker to get the result you want, otherwise, Archicad will snap to the Snap Grid, which can cause slight inaccuracies in placement.
So, the use of the Snap Grid offers the most advantages when creating orthogonal geometries.

Actually, there is another caveat, too: the smart cursor will not find element nodes and edges unless they fall exactly on the Snap Grid. In that case, you again have to turn off Grid Snap to find those element nodes/edges.