* engine: interface crest (GitHub #21) -- with PROP.iface on, every wall (prop, part-attached, squat, Draw/fill, wedge blade) splits 0.6 mm under its top into body + crest, the crest and the tine comb tagged (v[3] = 1) so triRanges/removal/Worker are untouched; the 3MF writer's separate form writes the tagged triangles as a third object, '<name> interface', in register; off (the default) is byte-identical
* site: Interface material switch (Walls) -- the crest and tines show purple and export as their own 3MF object, for a toolchanger's second filament (PETG under PLA); reaches the Worker via tunables and Draw on the page; re-import still pre-selects the part; German strings; plugins leave it out (one body to the host)
* engine: interface crest review fixes -- sway brace tines are interface too (Auto and Draw); the crest is one trapezoid on the taper line, so no section has a collinear corner (zero-area cap triangles); Interface material is in the undo history; FIN-SPEC lists what is not split yet (sway rib edge, a part-standing wall's foot, a wedge whose contact steps straight up) (review)
* site: the interface is a part of the supports object, not its own -- an object starting in mid-air is refused by Orca ('empty first layer'); as the supports' second component it stands on the plate with them and takes its own filament per part
* engine: interface crest modes -- 'flat' (the default when on) crests a wall station only under an underside within 10deg of level, a full-width (th) 0.6 mm block with no tip taper, tines left in the body; 'all' crests every wall top and the tines as before. A 35deg cube's print with the crest everywhere couldn't lay PETG on the narrow PLA tip through every layer; PETG interfaces are used on flat undersides. Off stays byte-identical (sweep vs main)
* site: Interface material is a dropdown (Off / Flat contacts / Everywhere); the readout says when it is on and no wall got a crest; German strings
* engine: interface modes review fixes -- cutouts under a flat crest keep their old ceiling (holeTop: the taper start, not the crest's cut), so the split loses no plastic (lbracket Y8 lattice lost 4.6%); the crest's part reference is set only while the crest is on and dropped after each build; the readout's 'no flat contacts' note counts walls only (not the pad) and only in Flat contacts; tests: flat mode with lattice/diamond cutouts, mixed flat/tilted walls, squat walls (review)
* engine: the interface crest is one layer of the print (PROP.ifaceLayers 1, the Layer height field, as the tines), not a fixed 0.6 mm -- one tool change each way per flat contact instead of three; tooltip and FIN-SPEC say so; tests: the crest is one 0.2 / 0.3 mm layer
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Co-authored-by: matthewtrahan <mathyout@pm.me>
