Draw truncated shapes in RViz

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Hello,

I would like to represent some shapes in RViz that are not provided by basic shapes (CUBE, SPHERE, LINES).

Here is an example of truncated shape I would like to draw: a truncated cone to represent DoF around an angle

(this is just a picture of truncated cone found on the web, my problem has nothing to do with HSV)

I would like to truncate the cone differently for each marker so importing a mesh is definitely to be avoided.

Can I do it via a plug-in? Do I have to add new shapes in RViz directly? Do you have some advices? :)

Thank you by advance