trajpar

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trajpar is a system parameter in Pro/ENGINEER that varies from 0 to 1 across the length of a given path. It is used to create complex geometric and non-geometric shapes that vary in dimension along the length of any given path.

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[edit] Naming

trajpar derives from the words: trajectory parameter. It is a pseudo-variable as it is controlled not by any mathematical representation, but by the physical representation of a path, i.e. a trajectory.

[edit] Uses and notability

trajpar can be used with various mathematical functions to create alternating, flaring, bowing or sinusoidal protrusions. It is primarily used in conjunction with the variable section sweep command in Pro/ENGINEER but can also remove material if desired.

trajpar typifies what makes Pro/ENGINEER different from many other CAD software systems. The level of complexity and control given to the user is much greater than, for example, SolidWorks.

[edit] Samples

To create an undulating wave, a sinusoid might be desired:

d1=sin(trajpar \cdot 8\pi)

A flare:

d1 = 1 + trajpar2

etc., where d1 is the dimension to be controlled.

[edit] See also

[edit] External links

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