--- ray/doc/man/man1/rcontrib.1 2020/09/09 21:28:19 1.18 +++ ray/doc/man/man1/rcontrib.1 2020/09/10 17:52:46 1.19 @@ -1,4 +1,4 @@ -.\" RCSid "$Id: rcontrib.1,v 1.18 2020/09/09 21:28:19 greg Exp $" +.\" RCSid "$Id: rcontrib.1,v 1.19 2020/09/10 17:52:46 greg Exp $" .TH RCONTRIB 1 5/25/05 RADIANCE .SH NAME rcontrib - compute contribution coefficients in a RADIANCE scene @@ -121,10 +121,25 @@ Note that output flushing via zero-direction rays is d .I \-c set to zero. .PP +Output flushing at fixed intervals may be enabled with the +.I \-x +option, which specifies the number of records +(-c accumulations) before each flush. +If the +.I \-y +option is also set, then periodic flushing is disabled and the +output size for an RGB image is the taken from the x and y dimensions. +In lieu of periodic flushing, a flush may be forced as mentioned above +by sending a sample with a zero direction vector, although you +must still send a full record of rays before output occurs. +.PP If progress reports are desired, the .I \-t option specifies a time interval in seconds for reports sent to standard error. +This requires that the number of input samples is known, meaning a +.I \-y +parameter has been specified. .PP The output of .I rcontrib