If you want to update the TikZ images (mostly in the InterpolationTypes), you need recompile the *.tikz files and convert them to PNG. You'll find them in doc/images. To compile to PDF use

1 pdflatex Tetrahedron3D.tikz

and then convert them to PNG using

1 convert -density 200 Tetrahedron3D.pdf Tetrahedron3D.png

Thank you for flying with LaTeXTikZImageMagick Air.