Reply To: Import .stl files from prolith to FDTD, scaling factor and parameter problems.

[Guilin Sun]

Sorry, my reply was gone nowhere.

A1: no, not wrong. It is display and numerical discrete result.

A2: the data is the original data. You need to extract where the material/geometry begins. for example:

clear;

index=getresult("monitor","index");

ind=index.index_x;

nmax=max(ind);

x=index.x;

y=index.y;

plot(x,ind(:,find(y,0)));

linex=ind(:,find(y,0));

aa=find(linex>1);

?x(aa);

This is all the x data for the material.

 

index_x,index_y and index_z are for Ex,Ey and Ez from the Yee mesh, since FDTD makes them displaced in purpose. Inside FDTD, the discrete geometry will look differently from real word.

 

A3: after discritization the geometry will be different. For visualization FDTD has interpolated them into the same location. Please refer the Yee mesh:

 

A4: the grids you are referring to is for visualization only. It has no any effect for simulation and discritization.