The synthesis of solids bounded by many faces
Communications of the ACM
Characterizing non-ideal shapes in terms of dimensions and tolerances
SIGGRAPH '78 Proceedings of the 5th annual conference on Computer graphics and interactive techniques
On storing and changing shape information
SIGGRAPH '78 Proceedings of the 5th annual conference on Computer graphics and interactive techniques
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The paper describes the experiences of a small team in writing a substantial ALGOL 68 program to model the shapes of engineering components. The application derives much advantage from structures, operators and the heap. It includes a command interpreter, graphics package, vector and matrix routines, and procedures for moving data structures on the heap to and from disc. A system has been devised to ensure safe, selective compilation of program segments.