Forgive me for replying to such an old question. Sam pointed me to this, and I think it might be related to the runtest failures in origin/circular-blend-arc-rc1.
On Thu, Dec 26, 2013 at 12:55:43PM -0500, Robert Ellenberg wrote: > > I'm not sure what the original intent of Naive CAM detection was, but > eliminating a segment that is clearly "not tangent" by its angle with the > previous line seems counter-intuitive to me. However, this behavior does > make sense if its job is to "coarsen" a given path by a certain linear > tolerance. Yes that's its job: to make segments as long as possible, by removing any endpoints whose removal do not cause the path to move by more than the tolerance. > To me, this is bad because the blend tolerance (P0.5) is effectively > applied twice. In the example above, line N2 is eliminated entirely, which > means the path is already up to 0.5mm from ideal when it is passed to the > trajectory planner. Now, TP applies a blend with tolerance, leading to > another 0.5mm deviation, for a total of 1mm possible deviation. I don't think this is correct. The endpoints of the NCD path are exactly the same as some of the original endpoints, and blending happens at endpoints. So you will tend to have NCD path diversion (along the path where points have been removed) or blend diversion (at endpoints), but not both. It seems like you might get SOME effect from both at the same time (but I'm not coming up with a picture of a good corner case in my head). In your image, https://www.dropbox.com/s/bpg2xvxa30yrpzl/following%20error.png I don't know what the actual diversion tolerance is, but it appears the NCD diversion (from horizontal, due to the path aiming at the second corner) and the blend diversion (inside the newly-formed corner) don't add at all. The diversion throughout the blend appears to be less than the diversion we had earlier due to only the NCD. (This is hard to talk about, without pointing at the picture - I hope my writing is clear enough) This may be moot; I am hoping you can just remove the NCD with your new planner. Chris ------------------------------------------------------------------------------ Subversion Kills Productivity. Get off Subversion & Make the Move to Perforce. With Perforce, you get hassle-free workflows. Merge that actually works. Faster operations. Version large binaries. Built-in WAN optimization and the freedom to use Git, Perforce or both. Make the move to Perforce. http://pubads.g.doubleclick.net/gampad/clk?id=122218951&iu=/4140/ostg.clktrk _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
