The following is my plotter art workflow with Unity.

1. On Unity, render a monochrome line-art image using the Recolor (contour line) effect. The resolution of the image should be high enough. I usually use 2400x3840.

2. Rotate it if needed. convert temp.png -rotate 90 render.png

3. Convert it to a black/white (complete binary) image. convert temp.png -threshold 5% render.png

4. Convert it into SVG using autotrace. autotrace --centerline --output-format=svg render.png > plot.svg

5. Edit the SVG file to change the resolution to 480x300.

6. Edit the SVG file to add a scaling group. <g transform="scale(0.125)">...</g>.

7. Plot the SVG file. axicli plot.svg -G 3

The official version of autotrace doesn't work for me (it emits segfaults with png files). I used hanmertens' fork instead.

Memo: To toggle the pen position, use axicli -m toggle

Memo: To build autotrace, the following packages are needed:

autoconf intltool autopoint libglib2.0-dev libtool libmagickcore-dev libpstoedit-dev