Creo tookit geometric traversal and evaluator

CREO-TOOLKIT ( PRO-TOOLKIT)GEOMETRIC TRAVERSAL AND

EVALUATOR

Sandip Jadhav

Harshil Oza

CENTRE FOR COMPUTATIONAL TECHNOLOGIES - (CCTECH) WWW.CCTECH.CO.IN

TOPICS

Geometrical Representation

Evaluator

Example Code


GEOMETRY HIERARCHY

Geometry in Pro/Engineer repressed by below terminology Face

Surface

Contour

Edge

Curve

Part

Face

Contour

Edge

Curve

Surface


GEOMETRY TERMS

• An ideal geometric representation, that is, an infinite plane

Surface

• A trimmed surface. A face has one or more contours

Face

• A closed loop on a face. A contour can belong to one face only

Contour

• The boundary of a trimmed surfaceEdge


GEOMETRY TERMS EXAMPLE 1

Face A has 1 contour and 4 edges

Edge E2 is the intersection of faces A and B

Edge E2 is a component of contours C1 and C2



Face A has 2 contours

Edges E1,E2,E3,E4 forming outer ,E5 and E6 forming inner contour



Face B has 2 Outer contours and 8 edges

Face A has 1 contour and 6 edges

Face C has 1 contour and 4 edges

Model Creation: This part was extruded from a rectangular cross section. The feature on the top was added later as an extruded protrusion in the shape of a semicircleCENTRE FOR COMPUTATIONAL TECHNOLOGIES - (CCTECH) WWW.CCTECH.CO.IN


Face A has 1 contour and 6 edges.

Face B has 1 contour and 4 edges.

Face C has 1 contour and 4 edges.

Face D has 1 contour and 4 edges.

Model Creation: This part was extruded from a cross section identical to Face A. In the Sketcher, the top boundary was sketched with two lines and an arc CENTRE FOR COMPUTATIONAL TECHNOLOGIES - (CCTECH) WWW.CCTECH.CO.IN


Face B has 3 Contour

2 Outer and 1 inner contour

Face A has 1 contour and 8 edges.

Model Creation: This part was extruded from a cross section identical to Face A


GEOMETRY TRAVERSAL API

Walk through the surfaces of a part, using ProSolidSurfaceVisit()

Walk through the contours of each surface, using ProSurfaceContourVisit()

Walk through the edges of each contour, using ProContourEdgeVisit()


EVALUATOR

The geometry of each edge or curve in Pro/ENGINEER is described as a set of three parametric equations that represent the values of X, Y, and Z as functions of the independent parameter, t

For a surface, the three equations are functions of the two independent parameters u and v


EVALUATOR

The Pro/TOOLKIT functions described in this section provide the ability to evaluate the parametric edge and surface functions, that is, find the values and derivatives of X, Y and Z for the specified values of t, or u and v.

They also provide for reverse evaluation


CURVE EVALUATOR API

ProCurveDataGet()

ProCurveParamEval()

ProCurveXyzdataEval()

ProCurveParamByLengthEval()

Retrieves the geometric representation data for the specified curve(example :for a Line it gives start and end points)


CURVE EVALUATOR API

ProCurveDataGet()

ProCurveParamEval()



Finds the corresponding normalized parameter on the curve, given the XYZ point


CURVE EVALUATOR API

ProCurveDataGet()

ProCurveParamEval()



Evaluates the specified curve at the parameter


CURVE EVALUATOR API

ProCurveDataGet()

ProCurveParamEval()



Finds the length of the specified curve between two given parameters


SURFACE EVALUATOR APIProSurfaceDataGet()

ProSurfaceParamEval()

ProSurfaceUvpntVerify()

ProSurfacePrincipalCrvtEval()

ProSurfaceXyzdataEval()

Retrieves the geometric representation data of the specified surfaceSurface Type

UV Min-Max

XYZ min-Max

Orientation

Id etc







Finds the closest corresponding UV point on the surface, given the xyz point







Verifies whether the specified UV point lies within the surface boundaries







Finds principal curvatures and directions of the surface at the given UV point






ProSurfaceXyzdataEval() Evaluates the surface in the specified UV point.


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Centre for Computational Technologies Pvt. Ltd.

Development Centre

1, Akshay Residancy, 50 Anand Park,Aundh, Pune -7


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Creo tookit geometric traversal and evaluator

Design

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