Migrating the technical discussion to the mailing list where it belongs. On Aug 31, 2013, at 8:32 AM, Harmanpreet Singh wrote:
> On Fri, Aug 30, 2013 at 12:41 PM, Christopher Sean Morrison > <brl...@mac.com> wrote: > >> or converting them to boundary representation format (brep command) and >> comparing volume with the non-brep form to make sure they match (see the >> sh/cmp.sh script for examples). > > I convert implicit sphere (radius 5, units: mm) object into brep > version and ran gqa -Av to calculate and compare their volumes. From > output, I got different results (see undersigned). Are these expected > results? Or do I need to set any flag to get desired output? Since, > I'm not familiar with many of these calculations and values so need > your suggestions. The results will converge with the right settings.. The problem is in the usage. The sphere you made has a 5mm radius. Since you didn't tell gqa what sample density to start with, it starts with a default far too big for a model that small. It adjusts to something smaller, but not anywhere near small enough. > mged> gqa -Av sphere > Trying initial grid spacing: 50 mm > Using grid spacing lower limit: 0.005 mm > Initial grid spacing 50 mm does not allow 1 samples per axis. > Adjusted initial grid spacing to 5 mm to get 2 samples per model axis. > Using estimated volume tolerance 1 cu mm > Processing with grid spacing 5 mm 1 x 1 x 1 There it said it merely sampled 1x1x1. It needs to sample something like 256x256x256 at a minimum. You'll need to either make the sphere much much bigger (like 5m), or tell gqa a grid spacing (e.g., 0.001). There is a manual page that describes the usage (man gqa). Cheers! Sean ------------------------------------------------------------------------------ Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58040911&iu=/4140/ostg.clktrk _______________________________________________ BRL-CAD Developer mailing list brlcad-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/brlcad-devel
