hm_getmatrixdifference

Given 4x4 transformation matrices M1 and M2, return the 4x4 matrix representing M1-1M2.

Syntax

hm_getmatrixdifference matrix_1 matrix_2

Type

HyperMesh Tcl Query Command

Description

Given 4x4 transformation matrices, representing the orientation and positions of two geometric shapes A and B, return the transformation matrix that brings the A to B. This can be used in conjunction with hm_getorientation that returns the transformation matrices for various entity types.

The ouput is a list of 16 values representing the 4x4 matrix M1-1M2.

Inputs

matrix_1: The first matrix, passed in as a list of 16 values.
matrix_2: The second matrix, passed in as a list of 16 values.

Examples

Find the difference between the orientation of two selections of surfaces:

*createmark surfs 1 23-44
set x [hm_getorientation surfs 1]
*createmark surfs 1 56-60
set y [hm_getorientation surfs 1]
hm_getmatrixdifference $x $y

Find the difference between the orientation of two components:

*createmark comps 1 44 45
set x [hm_getorientation comps 1 comparetype=1]
hm_getmatrixdifference [list [lindex $x 0]] [list [lindex $x 1]]

Errors

Incorrect usage results in a Tcl error. To detect errors, you can use the catch command:

if { [ catch {command_name...} ] } {
   # Handle error
}

Version History

2021