Restricción de refracción (Ley de Snell)

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This page is a translated version of the page Sketcher ConstrainSnellsLaw and the translation is 5% complete.
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Constraint SnellsLaw.svg Restricción de refracción (Ley de Snell)

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Constrains two lines to follow the law of refraction of light as it penetrates through an interface, where two materials of different refraction indices meet. See Snell's law on Wikipedia for more info.

Snells law2 witheq.svg

Snell's Law


Sketcher SnellsLaw Example1.png

The sequence of clicks is indicated by yellow arrows with numbers. n1, n2 are only labels to show where the indices of refraction are.

  • You will need two lines that are to follow a beam of light, and a curve to act as an interface. The lines should be on different sides of the interface.
  • Select the endpoint of one line, an endpoint of another line, and the interface edge. The interface can be a Line, an Arc, a Circle or a Conic. Note the order you've selected the endpoints.
  • Invoke the constraint. A dialog will appear asking for a ratio of indices of refraction n2/n1. n2 corresponds to the medium where the second selected endpoint's line resides, n1 is for the first line.
  • The endpoints will be made coincident (if needed), constrained onto the interface (if needed), and the Snell's law will become constrained.

Note that several helper constraints will be added automatically (point-on-object, coincident). They can be deleted if they cause redundancy or added manually if they were not added automatically. For the actual Snell's law constraint the endpoints of lines must coincide and lay on the interface, otherwise the behavior is undefined.

Using the Sketcher CreatePolyline.svg Polyline, it is possible to speed up drawing rays of light. In this case one can select two coincident endpoints by box selection.


  • The actual Snell's law constraint enforces the plain law equation n1*sin(theta1) = n2*sin(theta2). It needs the line ends to be made coincident and on the interface by other constraints. The necessary helper constraints are added automatically based on the current coordinates of the elements.
  • Python routine does not add the helper constraints. These must be added manually by the script (see example in Scripting section).
  • These helper constraints can be temporarily deleted and the endpoints dragged apart, which can be useful in case one wants to construct a reflected ray or birefringence rays.
  • Unlike the reality, refraction indices are associated with rays of light, but not according to the sides of the boundary. This is useful to emulate birefringence, construct paths of different wavelengths due to refraction, and easily construct angle of onset of total internal reflection.
  • Both rays can be on the same side of the interface, satisfying the constraint equation. This is physical nonsense, unless the ratio n2/n1 is 1.0, in which case the constraint emulates a reflection.
  • Arcs of circle and ellipse are also accepted as rays (physical nonsense).


The constraints can be created from macros and from the Python console by using the following function:



  • Sketch is a sketch object
  • line1 and pointpos1 are two integers identifying the endpoint of the line in medium with refractive index of n1. line1 is the line's index in the sketch (the value, returned by Sketch.addGeometry), and pointpos1 should be 1 for start point and 2 for end point.
  • line2 and pointpos2 are the indexes specifying the endpoint of the second line (in medium n2)
  • interface is the index specifying the line indicating the position of the interface between medium n1 and medium n2
  • n2byn1 is a floating-point number equal to the ratio of refractive indices n2/n1

The Sketcher scripting page explains the values which can be used for line1, pointpos1, line2, pointpos2 and interface and contains further examples on how to create constraints from Python scripts.


import Sketcher
import Part
import FreeCAD

StartPoint = 1
EndPoint = 2
MiddlePoint = 3

f = App.activeDocument().addObject("Sketcher::SketchObject","Sketch")

# add geometry to the sketch
icir = f.addGeometry(Part.Circle(App.Vector(-547.612366,227.479736,0),App.Vector(0,0,1),68.161979))
iline1 = f.addGeometry(Part.LineSegment(App.Vector(-667.331726,244.127090,0),App.Vector(-604.284241,269.275238,0)))
iline2 = f.addGeometry(Part.LineSegment(App.Vector(-604.284241,269.275238,0),App.Vector(-490.940491,256.878265,0)))
# add constraints
# helper constraints:
# the Snell's law: