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There is currently no clean mechanism to draw visuals from a plugin or via a message.

The problem you're seeing, with trying to use DynamicLines within a World plugin, is the the physics sever (where your plugin lives) is in a separate process from the rendering engine.

Currently on our list of things to finish is a message-based system to draw visuals, which would suite your needs.

It will likely be a few weeks before this feature is implemented. However, I can help you get started if you want to tackle it yourself.