Preview3D

Three ways to look at a model • Shaded, shaded with its edges, or a wireframe — from the toolbar on iPad, or the view menu on iPhone. • The edges of a STEP file are the real ones its CAD system drew, not the boundaries of triangles. A mesh gets its crease lines instead, so an STL still reads as the shape it is. • Wireframe keeps the faces present but unpainted, so the far side of a part does not show through the near one, and an outline traces the silhouette. • On an iPhone held upright, a wide model used to run off both edges. It fits again. • A small part in a large file came out coarse — a 6 mm gear had a sixteen-sided bore and a faceted hub. How finely a curve is divided now follows the part's own size rather than the file's units; small parts come out smooth, large ones are unchanged. • A narrow strip on a large curved face used to be triangulated across the curve instead of along it — two straight chords where a rail should bend. Fixed. • A closed spline edge could be read the wrong way round, leaving a seam where a surface should have closed. Models that reported as not watertight may now report as watertight. • Assemblies open faster: their parts are now cut from the mesh already computed instead of being tessellated a second time. • Opening another file while a large STEP is still loading stops that load inside the kernel, rather than waiting for it to finish. • Panel text, legends and the file-type list are legible in both appearances — measured on screen rather than guessed — and a model stops turning by itself when Reduce Motion is on.