The Uniform Direction Apodization option scales all source rays to have uniform power as a function of ray direction, which is equivalent to having no direction apodization. Consider a plane of random rays emitting into a 90o cone half angle with Uniform Direction Apodization applied. If the source is defined to have a Lambertian direction distribution on the Positions/Directions tab of the detailed source dialog, then the ray directions are distributed evenly in direction cosine space and the intensity distribution would then be uniform (in direction cosine space). If, on the other hand, the source is defined to have an isotropic direction distribution, then the rays are uniformly distributed in angle space and the intensity distribution would then be uniform in angle space but not in direction cosine space. These two cases are shown below. The left image is a Lambertian direction distribution and the right image is an isotropic direction distribution, both of which are shown in direction cosine space.
The Uniform Unit Apodization is available on the Power tab of a Detailed Source dialog. From the Power tab, select "Uniform Unit Apodization (equivalent to no apodization)" from the drop down menu of directional apodization types.
The following table describes the available controls on the Power tab of a Detailed Source dialog. Of interest to this help topic are the Direction Apodization parameter settings.
Direction Apodization - Sampled as a function of spherical angles Direction Apodization - Inverse Lambertian in a given direction Direction Apodization - Gaussian Direction Apodization - cos^n or sin^n in a given direction Direction Apodization - Lambertian in a given direction
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