OpenSCAD’s “preview” and “render” functions have such separate code paths that I’ve had a little project preview fine but fail to render; and now it renders fine but fails to preview.
In the former case, by the way, the cause was non-planar polygons. The preview function auto-tessellated them with triangles but the render did not. (And didn’t throw a coherent error either, I figured this out by guesswork)
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The latter case seems to be some fixed object limit in the preview code that I’ve exceeded