# Name

Transform Class

# Usage

## Examples

- Here are some examples of creating a Transform3D object. Much more will be added later.

All angles are in degrees Creating just rotations: RA=Transform3D(0,0,25); # Default is the ZXZ convention RA=Transform3D(EULER_SPIDER,0,0,25); # This is the typical ZYZ convention RA=Transform3D(m11,m12,m13,m21,m22,m23,m31,m32,m33) # create the transformation by entering components Creating more complicated transformations using set : RA = Transform3D(); # this creates the 3D identity matrix RA.set_rotation(0,0,25); # creates a matrix that will rotate 2D images by 25 degrees RA.set_posttrans(Vec3f(1,0,0)); # the matrix will now also shift 1 pixel in the x-direction RA.set_scale(1); # Occaisionally one will wish to rescale. Notes: a) We could have used EMAN, IMAGIC, SPIN, QUATERNION, SGIROT, MRC, XYZ, MATRIX instead of the SPIDER of EULER_SPIDER above. b) There is also a set_rotation via a dictionary object, which we will explain at length soon. c) The first two lines of the second block of commands, could have been written as the second line of the first block of commands. d) There are corresponding "get" calls to extract the information from the matrices. SPARX has some of its own, that are wrappers for these get calls. More later.

# Description

Purpose: to apply rotation/shift/scaling operations for 2D or 3D images via a variety of methods.

# Author

P. R. Baldwin

# Maintainer

P. R. Baldwin

# Keywords

- category 1
- FUNDAMENTALS

# Files

libEM

# See also

# Maturity

Infancy