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by marktaff
Mon Sep 22, 2014 4:07 pm
Forum: Developers corner
Topic: Sketcher: Ellipse support
Replies: 713
Views: 93079

Re: Sketcher: Ellipse support

Assume we are working in a polar perifocal frame (using the oribit equation): The equation to find a point on the conic section is the same for all conic sections (constrained by the input angle theta, i.e. r(theta)) The equations to find normal, tangential, and binormal* vectors at the point is the...
by marktaff
Mon Sep 22, 2014 3:37 pm
Forum: Developers corner
Topic: Introduction and Intentions
Replies: 6
Views: 1346

Re: Introduction and Intentions

Thansk guys! I've added your PPA normandc and rebuilt FreeCad. I've also updated my notes with the proper apt-get regex for the oce.*-dev packages.
by marktaff
Mon Sep 22, 2014 3:08 pm
Forum: Developers corner
Topic: Sketcher: Ellipse support
Replies: 713
Views: 93079

Re: Sketcher: Ellipse support

I'm still a newb here, so take my ideas with a grain of salt, as they are not informed by a kowledge of the codebase. I'll be getting the rest of my env set up today, building the doxs, and poking around in the sketcher 'circle' to familiarize myself with how things work. Regardless of whether these...
by marktaff
Mon Sep 22, 2014 1:31 am
Forum: Developers corner
Topic: Sketcher: Ellipse support
Replies: 713
Views: 93079

Re: Sketcher: Ellipse support

Yep, conic sections are a *lot* easier in polar; in fact, they *all* have the same equation! I have an advantage in that I have my orbital mechanics text (Curtiss) sitting right here. The equation you posted is one form of the 'orbit equation', aka Kepler's First Law. The e is the eccentricity; if i...
by marktaff
Sun Sep 21, 2014 10:12 pm
Forum: Developers corner
Topic: Sketcher: Ellipse support
Replies: 713
Views: 93079

Re: Sketcher: Ellipse support

I'm still working on setting up my dev environment, and haven't even peeked at the code yet, though I have read this thread. So take this with a grain of salt--I don't want to step on anyone's toes. :-) In reading this thread, I've seen you guys beat yourselves up doing this conic section math in ca...
by marktaff
Sun Sep 21, 2014 7:16 pm
Forum: Developers corner
Topic: Introduction and Intentions
Replies: 6
Views: 1346

Re: Introduction and Intentions

Thank you all for the warm welcome. :-) The first debug build of FreeCAD 0.15, Libs: 0.15R4060 (Git) successfully completed and ran. :-) For reference, some notes on my experience. Built on Kubuntu 14.04 LTS, x86_64. For some reason, apt-get couldn't find the liboce*-dev packages to install, but Muo...
by marktaff
Sun Sep 21, 2014 4:04 pm
Forum: Developers corner
Topic: Introduction and Intentions
Replies: 6
Views: 1346

Introduction and Intentions

Hi everyone. My name is Mark, and I am interested in doing some coding for FC. To begin with, I'd like to thank the past and present members of the FC team for creating a usable (IMO) cross-platform free software solid modeling program. Well done. :-) I have two A.S. degrees in engineering, and brie...

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