Sunday, August 06, 2006


First try at grids...

Laying out the grids and finding out what part of the grid lay inside the STL files was no problem. I used a quasi-boolean approach with a little smoothing added to find the perimeter boundaries.

The light blue grid nodes represent diagonals from the points that test outside of the STL boundaries.

Here you can see the infil diagonals set in purple.

Is there a big problem if the shapes are not outlined?

I can imagine as long as shapes are filled using orthogonal passes with each layer, sides should be relatively smooth. How much error or roughness actually appears if you don't outline?

Wouldn't it make sense to try to keep things ultra simple at first and add additional complexity as requirements are made, or is there more to the outlining of each solid at each layer than I am seeing?

I guess the reason I ask is that control logic seems to be easier if you simply treat the layers being extruded as a sequence of parallel colinear sets, rather than trying to work some 2D magic on them first.
I agree that it would be a lot easier if we didn't try to outline the slices. I suspect, though from looking at support structures that Stratasys prototyping machines create that without outlining the object that you were prototyping would look rather nasty.
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