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Comparing ray/doc/man/man1/bsdf2ttree.1 (file contents):
Revision 1.5 by greg, Fri Feb 20 18:26:08 2015 UTC vs.
Revision 1.6 by greg, Wed May 31 17:25:21 2017 UTC

# Line 7 | Line 7 | bsdf2ttree - generate XML tensor tree description of a
7   [
8   .B "\-pC"
9   ][
10 + .B "{+|-}a"
11 + ][
12   .B "\-g Nlog2"
13   ][
14   .B "\-t pctcull"
# Line 24 | Line 26 | or
26   [
27   .B "\-pC"
28   ][
29 + .B "{+|-}a"
30 + ][
31   .B "\-g Nlog2"
32   ][
33   .B "\-t pctcull"
# Line 51 | Line 55 | The
55   option by itself turns off the progress bar, whose length may be set
56   by an immediately following integer argument.
57   (The default progress bar length is 79 characters.)\0
58 + .PP
59 + The
60 + .I \-a
61 + option turns off reciprocity averaging for isotropic scattering or anisotropic reflection.
62 + Normally on (+a), this ensures that the tensor BRDF obeys Helmholtz reciprocity.
63 + However, in certain rare cases, reciprocity averaging can cause unwanted noise in the output.
64   .PP
65   The maximum resolution of the tensor tree may be controlled by the
66   .I \-g

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