From CSE HUJI Emacs Fonts HOWTOTo check if some font is available in emacs do following:

1. Switch to *scratch* buffer.
2. Type: (prin1-to-string (x-list-fonts “font-you-whant-to-check or pattern”)).
3. Place the cursor after the last closing paren and hit C-j. List of the names of available fonts matching given pattern will appear in the current buffer (*scratch*).
4. For listing of all available fonts use (prin1-to-string (x-list-fonts “*”)).

Pick one that you want to use and add or edit a line in ~/.Xdefaults

Emacs.font: font-name

These steps are not enough to make a new font in effect. Do the followings.

From How can I change the font for emacs in ubuntu 7.10

Edit~/ .Xdefaults
$ xrdb -merge ~/.Xdefaults

A better way is found.

From Permanent Font Change (~/.emacs)

Add in ~/.emacs :

(setq default-frame-alist '((font . "-font-name-from-xfontsel")))

The basic vtk pipeline is

Source->Filter->Mapper->Renderer

If a source is well-defined as an Algorithm in the vtk library already, it is simple to follow the pipeline.

It seems that an appropriate routine needs to be derived when an object is generated from an implicit function.

Object as an implicit function -> Sample function -> Filter (such as contour filter) -> Mapper ->Actor -> Renderer