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
You can use an appropriate rotation matrix a la:
http://en.wikipedia.org/wiki/Rotation_matrix
Once you figure out the coefficients, you can apply them in dot products to your origins in rcalc. For example, rotating about the Y-axis by 41.7 degrees:
rcalc -e '$3=$3;$4=$4;$5=$5' \
-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 ...
Hope this helps.
-Greg
From: "Randolph M. Fritz" <[email protected]>
Date: August 15, 2011 2:44:25 PM PDTI 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
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" <[email protected]>
Date: August 15, 2011 2:44:25 PM PDTI 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
Thanks, Greg!
Randolph
On 2011-08-15 15:29:03 -0700, Greg Ward said:
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" <[email protected]>
Date: August 15, 2011 2:44:25 PM PDTI 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
--
Randolph