concatenate two transformations
group DVconcat_xform {
GDxform_templ+Iparam &xform_in1;
GDxform_templ+Iparam &xform_in2;
GDxform_templ+Oparam xform_out;
method+notify_val+notify_inst upd_concat_xform = "concat_xform";
};
DVconcat_xform concatenates the xform transformation matrix of two inputs, thus "adding" one transformation on an object to another. For example, one field may be rotated, another scaled, and the output will be rotated and scaled.
Two xform transformation matrices. These can usually be obtained from the Grid of a field.