# Metafor

ULiege - Aerospace & Mechanical Engineering

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doc:user:geometry:user:operateurs

# Geometry/Mesh Operators

## Introduction

These kinds of operators are used to move/deform a geometry and its associated mesh from one configuration to another. The generic syntax is as follow:

op = XXXOperator(arg1, arg2, ...)
target.move(op)

where target is a geometrical entity (e.g. sideset(1), curveset(2))

As can be seen, the operator op must first be created. It takes several arguments, which can be values of Metafor objects (see below for specific operators). Then, the operator is applied to the target object (e.g. Side #1 or Curve #2).

## Translation Operator

This operator translates a geometry, meshed or not. The displacement is defined by a Vect3:

op = TranslationOperator(disp)

where

 disp Vect3 displacement vector

## Rotation Operator

This operator is used to rotate a geometry, meshed or not, along an axis. The rotation is defined by and angle (in radian) and an Axis:

op = RotationOperator(axis, angle)

where

 axis Axis rotation axis angle float angle (in radian)

## Alignment Operator

This operator is used to apply a rigid body motion (translation + rotation), to a geometric entity, meshed or not. This rigid body mode is defined by two Trihedra:

op = AlignmentOperator(trihedronRef, trihedronMesh)

trihedronRef is the trihedron to which the target must be moved, when trihedronMesh is a trihedron modelling a local frame of the side to be moved.

## Point-Reflection Operator

This operator is used to apply a point reflection (with or without a translation) to a geometric entity, meshed or not. This point reflection is defined by an Axis and an amplitude ampl:

op = RadialOperator(axe, ampl)
op.setDisplacement(disp)

where

 axe Axis reflection axis which indicates the direction of the point reflection ampl float amplitude disp Vect3 displacement vector

## Reflection/Symmetry Operator

This operator is used to apply a reflection symmetry to a geometric entity, meshed or not:

op = OrthogonalSymmetryOperator(plane)

where

 plane Plane reflection plane

## Scaling Operator

This operator is used to apply a scaling to a geometric entity, meshed or not.

op = ScalingOperator(pt0, fact)

where

 pt0 Point homothetic centre fact float scaling factor 