[Radiance-general] Rendering a single image with multiprocessor in Windows

[Rob Guglielmetti]

Hey Mo, I can share my results with you on this when I get back from vacation; I made a spreadsheet to calculate the views based on that code but as I recall I got some funky results. 

Also thanks for the heads up on rpiece in the windows packages, I'll make sure that's not included in the future! Oops...

> On Jul 31, 2014, at 11:59 PM, Greg Ward <gregoryjward at gmail.com> wrote:
> 
> It's possible, but not at all straightforward.  You basically have to use the attached code (taken from rpiece) to adjust the -vh and -vv options to rpict, then use the -vs and -vl options to determine which part of the picture you want to render.
> 
> Best,
> -Greg
> 
> 	switch (ourview.type) {
> 	case VT_PER:
> 		pview.horiz = (2.*180./PI)*atan(
> 				tan((PI/180./2.)*ourview.horiz)/hmult );
> 		pview.vert = (2.*180./PI)*atan(
> 				tan((PI/180./2.)*ourview.vert)/vmult );
> 		break;
> 	case VT_PAR:
> 	case VT_ANG:
> 		pview.horiz = ourview.horiz / hmult;
> 		pview.vert = ourview.vert / vmult;
> 		break;
> 	case VT_CYL:
> 		pview.horiz = ourview.horiz / hmult;
> 		pview.vert = (2.*180./PI)*atan(
> 				tan((PI/180./2.)*ourview.vert)/vmult );
> 		break;
> 	case VT_HEM:
> 		pview.horiz = (2.*180./PI)*asin(
> 				sin((PI/180./2.)*ourview.horiz)/hmult );
> 		pview.vert = (2.*180./PI)*asin(
> 				sin((PI/180./2.)*ourview.vert)/vmult );
> 		break;
> 	case VT_PLS:
> 		pview.horiz = sin((PI/180./2.)*ourview.horiz) /
> 				(1.0 + cos((PI/180./2.)*ourview.horiz)) / hmult;
> 		pview.horiz *= pview.horiz;
> 		pview.horiz = (2.*180./PI)*acos((1. - pview.horiz) /
> 						(1. + pview.horiz));
> 		pview.vert = sin((PI/180./2.)*ourview.vert) /
> 				(1.0 + cos((PI/180./2.)*ourview.vert)) / vmult;
> 		pview.vert *= pview.vert;
> 		pview.vert = (2.*180./PI)*acos((1. - pview.vert) /
> 						(1. + pview.vert));
> 		break;
> 	default:
> 		fprintf(stderr, "%s: unknown view type '-vt%c'\n",
> 				progname, ourview.type);
> 		exit(cleanup(1));
> 	}
> 
> 
>> From: Mostapha Sadeghipour <sadeghipour at gmail.com>
>> Subject: Re: [Radiance-general] Rendering a single image with multiprocessor in Windows
>> Date: July 31, 2014 2:43:17 PM PDT
>> 
>> I just read that rpiece is not supposed to be part of the Windows package for some reason so I probably should change the question to is it possible to render a segment of a view based on -X -Y pixels?
>> 
>> I can take care of running them in parallel and putting them back together separately.
>> 
>> Thanks,
>> Mostapha
>> 
>> 
>>> On Thu, Jul 31, 2014 at 4:28 PM, Mostapha Sadeghipour <sadeghipour at gmail.com> wrote:
>>> Hi all,
>>> 
>>> I wonder is anyone has successfully rendered a single image in parallel using rpict -PP and/or rpiece in Windows.
>>> 
>>> I have a hard time to understand both the process and the syntax.
>>> 
>>> Thanks,
>>> Mostapha 
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