MIL-PRF-28000 Digital Representation For Communication Of Product Data: Iges Application Subsets And Iges Application ProtocolsThis specification identifies the requirements to be met when product definition data is delivered in the digital format of the Initial Graphics Exchange Specification \(IGES, in accordance with the American National Standard \(ANS\) / United States Product Data Association \(US PRO\) standard. Discrete subsets and application protocols of the IGES entities are identified by class according to the application for which the digital data was prepared.

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MIL-PRF-28000B

6. DE field 7, transformation matrix, shall be 0.

7. Translation and rotation are restricted to XY plane. PD #R13, #R23, #R31, #R32, and #T3 shall be

0.0, and #R33 shall be 1.0 or -1.0.

8. PD #3, PROP1, shall be 1 (planar), ZK shall be 0.0, XNORM and YNORM shall be 0.0, ZNORM shall

be 1.0 or -1.0. Rational B-Splines are to be considered functionally and mathematically equivalent to

NURBS (Non-Uniform Rational B-Spline) curves.

9. PD #1,

number of view pointers, shall be 1.

PD #5,

number of annotation entities, shall be 0.

PD #6,

number of associativity pointers, shall be 0,

PD #7,

number of property pointers, shall be 1, 2 or 3.

PD #8-#10,

a DE pointer to a property (406, form 16) is required, a DE pointer to a property (406,

form 15) is optional, and a DE pointer to a property (406, form 17) is optional.

10. DE field 5, level, shall be 0.

DE field 6, view pointer, shall be 0.

DE field 7, transformation matrix pointer, shall be 0.

DE field 8, label display pointer, shall be 0.

11. PD #5, font code, shall be 1, 1001, 1002, 1003, or 3001, the Latin-1 character set. If a pointer to a

property entity (406, form 18) is used to control intercharacter spacing, then any IGES font value may

be used.

12. DE field 5, level, shall be 0.

13. PD #2, scale, shall be 1.0.

PD #3-#8 shall be 0.

14. PD values shall not point to entity type 412, entity type 414, or an entity 308 which points to a 412 or

414, and shall only point to other entity types within this subset.

15. N (the number of points, PD #2) shall be 3 or more.

16. The name property entity shall take precedence over a name in DE field 18, entity label, for any entity

which has a name property.

17. PD value for ZT coordinate shall be 0.0.

18. PD value for ZS(n) shall be 0.0, where n=1...N.

19. Drawing origin shall be the lower left-hand corner, no negative coordinates are allowed once all

appropriate offsets and rotations are applied.

20. Conic coefficient B (PD #2) shall be zero (0.0). An associated matrix shall be used to rotate/translate

the conic to its position in space.

21. PD #2, number of n-tuples, shall be greater than 2.