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ExPikaPaka
682814878d
Read each layer's texture from the archive only. `layer.path` comes from the project
file, so following it let any .3mf pick a local file to read, a UNC path among them,
and have the next save copy what it found into the archive. Reverts the disk fallback
added in 8ecfee6a2.
Store a paint mask only for the slots a triangle names. Eight empty strings per
triangle cost every project hundreds of megabytes on a large mesh, whether or not it
uses the feature. A slot's run is padded to the triangles seen so far on its first
value, so it stays indexed by triangle, and ends at its last painted one.
Report a malformed layer block instead of throwing out of the project load. The typed
accessors throw on a value of the wrong type and nothing above them caught that, so
one bad number cost the whole file rather than one volume's relief.
Cover the store and load round trip in test_3mf.cpp: the layer, its image, the options
and the paint, the two regressions above, paint at either end of the triangle list, two
volumes sharing a slot, and the wrong-typed documents at the unit level.