making model in gazebo other than box, cylinder, and sphere

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Hi.

I have made code that Pioneer2dx follows a given trajectory. In representing that trajectory, I want to use "arrow" or "triangle" to see the next direction.

To display "arrow" or "triangle" (It could be cylinder shape), what should I do? I want to make them with default models(box, cylinder, and sphere), is that possible? Is it possible that I cut the box in a diagonal direction to make triangular shape?

Any idea? Thank you very much! :)