create a local contour line of constant value at a picked probe location
group DVisoline_trace {
Mesh_Struct+Dim2+Node_Data+Iparam &in {
xform+nonotify;
nnodes+req;
};
Grid+Xform+Iparam &probe;
int+Iparam component;
int+Iparam color;
float+Oparam level;
Mesh+Node_Data+Oparam out {
&xform<weight=-1> => in.xform;
};
method+notify_val+notify_inst isoline_trace_update = "isoline_trace";
};
DVisoline_trace builds a local isoline of the specified component in the specified field from the given pick location by examining neighboring cells. If color is nonzero, the lines are colored by the data values. Otherwise the lines use the default line color in the viewer. It also outputs in "level" the value at the picked point (the value of the isoline).