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Tip to Speed up bricscad

I noticed a big slowdown when working with some large files.
I then discovered a workaround that speeds up everything: viz, bolean op. , extrudes...
You just have to place the model near the world origin!
That's it! It seems bricscad can't handle georeferenced models!


  • That is a common problem in many CAD systems, not just affecting speed but also causing errors within commands.

  • I always thought that Autocad/dwg would somehow not being
    effected by drawing far from origin.
    As nearly all Files I got from Autocad users over decades were
    always drawn far from origin. Kind of georeferenced location.

    In Vectorworks we get in trouble already when being just 4+ kilometers
    from internal origin. We need to set a invers user origin in such cases
    to keep the model around internal origin.
    I always that that Vectorworks only would be especially picky.

    I always thought DWG would somehow autofocus to the geometry
    bounding to get max resolution, no matter where it lays in space.

    So should I better care about origin in Bricscad too and also better move
    imported geometries every time back to drawing origin ?

  • An important factor in all this is the drawing unit. if 1 DU = 1mm you are more likely to have issues with a geo-referenced DWG than if 1DU = 1m.

  • You mean INSUNITS ?

    If you want to change these you would have to scale the geometry.
    And if they were wrong from the source, scaling would bring
    in all rounding errors anyway ?

  • In the Dutch situation city and landscape planning is done in meters with the origin, for historical reasons, located in Paris (distance Amsterdam-Paris is ca. 400 km). If you design in millimeters, insert such a plan at the origin and scale it up by a factor of 1000, you end up with larger coordinates (400*1000*1000) than if you work in meters and do not scale the plan.

    Actually the accuracy stays the same in term of significant figures, it is just that more of those figures are before the decimal separator for larger coordinates. In a DWG the number of significant figures is ca. 16.

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