On Jan 5, 2011 6:09 AM, "Anders Wallin" <[email protected]> wrote:
>
> > There are a few other people working on the problem of modeling material
> > removal. Unfortunately it seems that our approaches are different enough
> > that merging the projects would be difficult.
>
> hi all,
>
> I've done a bit of work modeling the stock as a signed-distance field.
> I'm using the classic marching-cubes algorithm to extract the
> iso-surface triangles of the stock model. There are more advanced
> approaches which also store surface normals in each octree vertex. To
> save space the distance field is not stored on a regular 3D grid, but
> in an octree which is subdivided whenever required.
> the approach is described here:
> http://www.cadanda.com/V2Nos1to4_11.pdf
> http://dx.doi.org/10.1080/00207540410001671651
> http://dx.doi.org/10.1115/1.3130231
>
> my results are here:
> http://www.youtube.com/watch?v=1DAvgLCj_RQ
> http://www.youtube.com/watch?v=17mpgQ4KVLg
>
> The code is here:
>
http://code.google.com/p/opencamlib/source/browse/#svn%2Ftrunk%2Fsrc%2Fcutsim
>
> This approach can deal with any kind of cutters as long as you come up
> with the distance field for the cutter, essentially a function that
> takes an xyz-position and returns positive outside the cutter and
> negative inside.
> To model cutting moves or sweeps the sampling-approach is used. The
> low-level operation (runs in 1ms or so) is to subtract the cutter
> positioned at some xyz from the stock. Linear/arc/etc. moves are dealt
> with by positioning the cutter at many sampled points along the path
> and calling the basic function which subtracts the (stationary) cutter
> for each sample point.
>
> I hope to do some more work on this in February. The to-do list could
> look something like this:
> - find a g-code interpreter (emc2 or other) which can be used to read
> g-code and output 'canonical' G1 type moves to the sim
If you want one c++ object for each g00/g01/g02/g03, you may be able to use
some of my code.
> - work on accelerating the opengl 3D view. I hear this involves things
> like VAOs and/or VBOs which I haven't tried.
> - I'm now calling the lib/sim from python, but this is probably too
> slow. Think about a C++ GUI that would integrate interp+3D-view+cutsim
> - fancy sim improvements:
> -- different colors for stock cut with different tools
> -- material removal rate calculation/plot/warning
> -- collision detection (fixtures=forbidden stock region,
> toolholder=forbidden cutter region)
> -- improved marching-cubes: dual-contouring, hermite-data, etc.
>
> enjoy,
> Anders
>
I need to figure out how to run cutsim!
Mark
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