This feature allows editing of the location/orientation primitives associated with material assignments. Of particular relevance are Gradient Index and Birefringent materials, since their anisotropic optical properties depend upon location and/or orientation with respect to a given surface or element.
This feature can be accessed in the following ways: •Menu > Tools > Edit/View GRIN Material Position/Orientation •Right mouse click on an entity in the object tree and select "Edit/View GRIN Material Position/Orientation" from the list menu
As an example, the Axial/Radial GRIN material shown below expresses the index in a functional form N(X,Y,Z). For materials of this type, X, Y and Z are expressed in the coordinate system of the surface to which the material is assigned. Therefore, this single definition can be applied to any number of elements within a FRED model and will, according to the position and orientation of a given element or surface, adapt the spatial definition of N(X,Y,Z) appropriately. This feature allows for further modification of the position and/or orientation of the material as illustrated below.
Consider two cylindrical rods shown below, each of which are assigned the above GRIN definition.
The Gradient Index or Birefringent Material Position/Orientation dialog as shown here can be used to alter the orientation of the GRIN definition in one of the two rods without the need to define a second, rotated GRIN material. In this case the GRIN material is rotated by 2 degrees about the X-axis of Lens 2.
The resulting trace through the two rods after this re-orientation is shown below where the rays are deviated from the axis of symmetry only in the second rod.
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