Where are the Gcode Circle Commands?

I have attempted to convert a few stl files to gcode using the RepRap host software only to discover that no circle commands are implemented in the gcode that the software produces. It appears as if all the movements are specified using g1 (controlled move) command. From what I understand this move is strictly linear, yet the stl file has circular components. Also, the page on the RepRap wiki describing all of the gcode commands has no mention of any circular motion command.

Am I missing something? Any help would be greatly appreciated.

STL files only have surfaces made from triangles, so when you slice them you only get straight lines. Circles are just polygons with about 32 sides.

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[www.hydraraptor.blogspot.com]

Marlin firmware and Slic3r support G2 and G3 commands for native arcs.

Sound Wrote:
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> Marlin firmware and Slic3r support G2 and G3
> commands for native arcs.


Interesting ! How does Slic3r decide what is an arc, given the stl file only carries straights ? Does it interpolate ?