vwright(1) normalize a RADIANCE view, shift it to the right


vwright [ view options ] distance
vwright [ view options ] name


In the first form, vwright shifts a RADIANCE view the specified distance to the right, putting out a complete set of view parameters in a single line on the standard output. This utility is most often used to compute a right-eyed view from a left-eye view for stereo imaging.

If no options are specified on the command line, vwright reads a view from its standard input.

The distance given is in world coordinate units. A negative value indicates a shift to the left rather than the right.

The second form substitutes a name prefix in place of the shift distance, and produces constant assignments on the standard output suitable for passing directly to rcalc(1). For a given prefix N, the constant names are as follows:

Nt:     view type ('v'==1,'l'==2,'a'==3,'h'==4,'c'==5,'s'==6)
Npx:    view point x value
Npy:    view point y value
Npz:    view point z value
Ndx:    view direction x value (normalized)
Ndy:    view direction y value (normalized)
Ndz:    view direction z value (normalized)
Nd:     view focal distance
Nux:    view up vector x value (normalized)
Nuy:    view up vector y value (normalized)
Nuz:    view up vector z value (normalized)
Nh:     view horizontal size
Nv:     view vertical size
Ns:     view shift
Nl:     view lift
No:     view fore clipping distance
Na:     view aft clipping distance
Nhx:    derived horizontal image vector x value (normalized)
Nhy:    derived horizontal image vector y value (normalized)
Nhz:    derived horizontal image vector z value (normalized)
Nhn:    derived horizontal image vector multiplier
Nvx:    derived vertical image vector x value (normalized)
Nvy:    derived vertical image vector y value (normalized)
Nvz:    derived vertical image vector z value (normalized)
Nvn:    derived vertical image vector multiplier


To start rpict(1) on a view .06 meters left of the view in the file "right.vf":
rpict `vwright -.06 < right.vf` scene.oct > right.hdr &

To move the rad(1) view named "left" 2.5 inches to the right and render from there:

rad -v "right `rad -n -s -V -v left examp.rif | vwright 2.5`" examp.rif &

To pass a view to rcalc for conversion to some other view:

rcalc -n -e `vwright orig < orig.vf` -f viewmod.cal -o view.fmt > new.vf


Greg Ward