Select to reflect rays at a wall according to Lambert’s cosine law. That is, the probability of a reflected ray propagating in a given direction within a solid angle dω is given by cos(θ)dω where θ is the angle between the direction of the ray and the wall normal.
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The value of γ should always be between 0 and 1.
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The Wall condition is set to Specular Reflection, Diffuse scattering, Isotropic scattering, General reflection, or Mixed diffuse and specular reflection.
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For Absorption coefficients enter the Absorption coefficient α (dimensionless). The default is 0. The intensity or power of the reflected ray will be proportional to 1 − α.
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For Absorber, specified impedance enter the Characteristic impedance of absorber Z1 (SI unit: Pa·s/m). The default value is 1 GPa·s/m, corresponding to a hard wall.
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For Reflection coefficients enter the Reflection coefficient R (dimensionless). The default value is 1. The intensity or power of the reflected ray will be proportional to R2.
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For Fluid-fluid interface enter the following:
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For Fluid-solid interface enter the following:
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For Layered fluid half-space enter the following:
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the Wall condition is set to Specular Reflection, General reflection, or Mixed diffuse and specular reflection. For Mixed diffuse and specular reflection the roughness only applies to the specularly reflected rays.
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