Backward Compatibility with Version 5.2

Anisotropic Refractive Indices can no Longer be Specified

In version 5.2 and earlier, it is possible to specify an anisotropic refractive index in the settings window for the Medium Properties node, despite the fact that the anisotropy of the refractive index is not taken into account when modeling ray propagation. In version 5.2a, only isotropic refractive indices can be specified in the settings window for the Medium Properties node. If an anisotropic refractive index was specified in an older version, then when opening the model in version 5.2a, all of the diagonal terms will be populated using the first diagonal value and all off-diagonal terms will be set to zero.

Renamed Intensity Computation Methods

The options in the Intensity Computation list in the settings window for the Geometrical Optics interface have been renamed.

•	Using principal curvatures has been renamed to Compute intensity.

•	Using principal curvatures and ray power has been renamed to Compute intensity and power.

•	Using curvature tensor has been renamed to Compute intensity in graded media.

•	Using curvature tensor and ray power has been renamed to Compute intensity and power in graded media.

Renamed Polarization Setting

In the Initial polarization type list, available for most ray release features in the Geometrical Optics interface, the option Partially coherent has been renamed to Partially polarized.

Changes to Perturbations for Solar Radiation

The treatment of perturbations due to sunshape and surface roughness has been changed in version 5.2a. This change affects the Illuminated Surface and Solar Radiation features for the Geometrical Optics interface.

The Use corrections for finite source diameter check box has been replaced by the Corrections for finite source diameter list. If the check box was selected, Create light cones at release points will be selected from the list after opening the model in version 5.2a. If the check box was cleared, None will be selected from the list.

For the Illuminated Surface, the Standard deviation of the angle of incidence parameter has been renamed Surface slope error and is now used to define a Rayleigh distribution for perturbations to the surface normal, rather than the angle of incidence of radiation. To account for the different effect that the surface slope error has on the model, any value or expression entered for the Standard deviation of the angle of incidence in version 5.2 or earlier will be divided by 2, before being used to specify the Surface slope error in version 5.2a.

The Number of rays in wave vector space Nw,r has been removed. The effect of surface roughness can no longer multiply the number of degrees of freedom created by a release feature at each release point.

Activation Conditions on Optical Components

The following boundary conditions require some form of ray intensity computation in order to have any effect on the solution:

•	Linear Polarizer

•	Linear Wave Retarder

•	Circular Wave Retarder

•	Ideal Depolarizer

•	Mueller Matrix

If any of these features is present in a model created in version 5.2 or earlier, and None is selected from the Intensity computation list in the settings window for the Geometrical Optics interface, then the feature will be automatically disabled when the model is opened in version 5.2a. To enable these features, select any option other than None from the Intensity Computation list.