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For Expression a single ray is released in the specified direction. Enter the radial and axial components of the Ray direction vector L0 (dimensionless).
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For Spherical a number of rays are released at each point, from the negative z-direction to the positive z-direction in the half-plane with r > 0. These rays are sampled from an anisotropic hemispherical distribution in wave vector space, so that rays are more heavily weighted toward the r-direction rather than the ±z-directions. In 3D this would correspond to a spherical distribution of rays such that each ray subtends approximately the same solid angle in wave vector space.
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For Conical a number of rays are released at each point, sampled from a conical distribution in wave vector space. Enter the Number of rays in wave vector space Nw (dimensionless). The default is 50. Then enter coordinates for the Cone axis r based on space dimension. Then enter the Cone angle α (SI unit: rad). The default is π/3 radians. Unlike the Spherical distribution, the rays in the Conical distribution each subtend the same angle in 2D, not the same solid angle in 3D.
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