[Radiance-general] Re: rtrace

[Jia Hu]

I see, thanks, Thomas.

On Tue, Jul 20, 2010 at 5:31 AM, Thomas Bleicher
<tbleicher at googlemail.com>wrote:

> > If I set -x to 0, and -y to 1, does that mean the program will not exit
> > until it finishes all calculations for all points?
>
> Just try it: use a small octree and a file with point and direction input
> and do
>
> rtrace -w -ab 1 -x 0 -y 1 scene.oct < input.pts
> rtrace -w -ab 1 -x 0 -y 1 scene.oct < input.pts
> rtrace -w -ab 1 -x 5 -y 1 scene.oct < input.pts
>
> The first line is the default for rtrace (-x an -y 0).
>
> > If I set -x to 5 and -y to 1, does that mean the program will exit after
> the
> > calculation for five points (only one line) is finished? In this case, I
> > have to run this program again to continue the calculation for the left
> > points?
>
> Yes but you have to remove the first 5 input lines from your points
> file or rtrace will calculate the first 5 points again.
>
> > Generally, if I set -x to 0 and want the program finishes all calculation
> at
> > one time, do I need to set -y?
>
> You don't have to set -x or -y to 0. The default for rtrace is to
> calculate all the lines in the input file. But if you have a file with
> 1000 points you will not see the results before the last of these
> points has been calculated. Therefore you may want to split your input
> in smaller files of say 100 lines each or set "-x" to 100. Then rtrace
> will write out the results for every group of 100 lines. Don't set
> "-x" too low, however, or you will notice a slow down of the
> calculation.
>
> Thomas
>
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