Downloaded from https://www.everyspec.com APPENDIX C MIL-STD-31000A into a face defined on a NURBS may be roughly equivalent in shape but will no longer maintain the design intent of representing a surface with that specific radius of curvature. C.9.1.6 Different Face Color (G-FA-DR) Definition: The color attribute of a set of translated faces is different from the color of the matching face(s) in the native model. Measurement: The sum of the absolute differences between corresponding integers in the RGB (red, green, blue) color definitions of the matched faces. Effects of condition on model-based definition translation:
If the color of faces in the native model is used to designate any kind of semantic meaning, the modification of face color during translation will produce a model which is not an equivalent derivative. C.9.1.7 Different Face Area (G-FA-DS) Definition: The surface area of a set of translated faces is different from the surface area of the matching face(s) in the native model. Measurement: The percent change from the area of the native face(s) to the area of the matched face(s). Effects of condition on model-based definition translation:
If the face in the native model has annotations which reference it, then the scope of application of the annotations in the translated model may be significantly different. C.9.2 Solid geometry validation criteria C.9.2.1 Unmatched Solid (G-SO-UM) Definition: A solid in one model has no corresponding solid in the other model. Measurement: The criterion is false if any solid in the native model does not have a corresponding solid in the translated model. Effects of condition on model-based definition translation: If the unmatched solid is in the native model, it represents significant data loss.
If the unmatched solid is in the translated model, it causes confusion and is generally the result of incorrect filtering during the translation process. C.9.2.2 Different Solid Area (G-SO-DS) Definition: The surface area of a translated solid is different from the surface area of the matching solid in the native model. 140