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(The default progress bar length is 79 characters.)\0 |
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.PP |
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The |
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< |
.I \-a |
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< |
option turns off reciprocity averaging for isotropic scattering or anisotropic reflection. |
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< |
Normally on (+a), this ensures that the tensor BRDF obeys Helmholtz reciprocity. |
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< |
However, in certain rare cases, reciprocity averaging can cause unwanted noise in the output. |
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> |
.I \+a |
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> |
option turns on reciprocity averaging for isotropic scattering or anisotropic reflection. |
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> |
Normally off (-a), this enforces each tensor-tree hemisphere to follow symmetry |
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> |
implied by Helmholtz reciprocity, and is designed to reduce noise in measured data. |
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> |
However, for some data, reciprocity averaging can make the output worse. |
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.PP |
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The maximum resolution of the tensor tree may be controlled by the |
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.I \-g |
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.I \-n |
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option controls the number of super-samples to send in patches whose |
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difference to its neighbors exceeds some threshold. |
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< |
The default number of super-samples is 256. |
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> |
The default number of super-samples is 64. |
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The difference threshold for super-sampling is controlled by the |
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.I \-s |
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option, and defaults to 0.35. |
