Up    Next

off_trans - transformations (rotations, etc) of OFF files

Usage    |    Examples    |    Notes

Usage

Synopsis

off_trans [options] input_files

Description

Read a file in OFF format and apply transformations to it.

Options

input_file
input file in OFF format, or if not given the program reads from stdin

-h
program help

-T <tran>
translation, three numbers seperated by commas which are used as the x, y and z displacements

-R <rot>
rotation about an axis, four numbers separated by commas. The first three numbers are a direction vector for the axis, the last number is the angle to rotate (in degrees)

-M <norm>
reflection in a plane, three numbers separated by commas which give a vector normal to the plane of reflection.

-S <scal>
scale, one, three or four numbers separated by commas. If one number then scale by this factor in all directions. If three numbers these are the factors to scale along the x, y and z axes. If four numbers, the first three are a direction vector for the scaling, the last number is the factor to scale

-I
invert (equivalent to -S -1)

-o <file>
write output to file, if this option is not used the program writes to standard output

Examples

cube.off is a cube with vertices (±1, ,±1, ±1). To rotate 45 degrees it about the edge running from (1,1,1) to (1,1,-1) the cube must be translated so that line passes through the origin, roatated 45 degrees about the direction of the line, then translated back. 
   off_trans -T -1,-1,0 -o cube_a.off cube.off
   off_trans -R 0,0,1,45 -o cube_b.off cube_a.off
   off_trans -T 1,1,0 -o final_cube.off cubeb.off
This can be combined as 
   off_trans -T 1,1,0 -R 0,0,1,45 -T 1,1,0 -o final_cube.off cube.off

Notes

Up: Programs and Documentation
Next: off_align - alignment of OFF files

Antiprism Documentation 9.3.2006 - http://www.antiprism.com/