The Grating boundary condition, along with its Diffraction Order subnodes, can be used to reflect rays and emit secondary rays to model interaction with gratings. You can specify the direction of periodicity and the size of the unit cell.

The Mirror boundary condition is a simplified Wall that only causes specular reflection.

The Axial Symmetry boundary condition is only available in 2D axisymmetric models. It is automatically applied at the axis of symmetry and can’t be applied anywhere else.

Optical devices like the Linear Polarizer and Linear Wave Retarder are available when ray intensity or power is computed. They don’t have any effect on the ray direction but they can affect the ray polarization.

The Wall condition also support condition ray-wall interactions. For example, you could cause rays to Freeze if a logical expression is satisfied—for example, having optical path length greater than a specified threshold—and subject them to Specular reflection otherwise. Together with the Mixed diffuse and specular reflection condition, it is possible to prescribe up to 3 different types of wall interaction at a single boundary.