StlNormals class

StlNormals class final

How a facet's normal is chosen.

A class with constants rather than an enum, so a value added in a minor release does not break a switch written against it: name is what a file or a snapshot writes, and byName reads it back.

Properties

hashCode → int: The hash code for this object.
no setterinherited
name → String: The stable name, and the wire name: what a file, a report or a snapshot writes for this value. Never renamed within a major.
final
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited

Methods

noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
toString() → String: A string representation of this object.
override

Operators

operator ==(Object other) → bool: The equality operator.
inherited

Static Methods

byName(String name) → StlNormals?: The value called name, or null for a name this version does not know, which is what a file written by a later version can carry.

Constants

fromFile → const StlNormals: The facet's own normal record — unless it is the zero vector, which a surprising number of exporters write instead of computing one, in which case this falls back to the triangle's own cross product for that facet alone rather than leaving a NaN in the mesh.
recomputed → const StlNormals: Always the cross product of the triangle's own edges, ignoring whatever the file recorded. STL has no shared vertices to smooth across, so this is never a worse answer than the file's own normal and is sometimes a better one — a mesh assembled by hand or converted through a lossy tool can have facets whose recorded normal simply disagrees with its winding.
values → const List<StlNormals>: Every value this version names, in declaration order. A later version appends; nothing is removed or renamed within a major.