[Radiance-general] Affine Transformations in Rcalc?

[Greg Ward]

Small goof:

	rcalc -e '$4=$4;$5=$5;$6=$6' \
		-e 'th:41.7*PI/180' \
		-e 'c11:cos(th);c12:0;c13:sin(th)' \
		-e 'c21:0;c22:1;c23:0' \
		-e 'c31:-sin(th);c32:0;c33:cos(th)' \
		-e '$1=c11*$1+c12*$2+c13*$3' \
		-e '$2=c21*$1+c22*$2+c23*$3' \
		-e '$3=c31*$1+c32*$2+c33*$3' input.ray | rtrace ...

Also, I'm not sure if this gives you a clockwise or counter-clockwise rotation.  You may have to experiment a bit.

-Greg

> From: "Randolph M. Fritz" <RFritz at lbl.gov>
> Date: August 15, 2011 2:44:25 PM PDT
> 
> I have a series of rays intended for input to rtrace.  I would like to be able to rotate the starting point and direction of these around the origin.  Is there any simple way to do this with rcalc ro some other Radiance tool, or do I have to find another way?
> 
> -- 
> Randolph
>