dynamically generate lines/sprites between anchor points

I have been stumped for the past month on how to accomplish this.

Say we tap to create a box as a destination point, and at the same moment upon creation, there is a start anchor that is generated programmatically based on the FPCamera and pushed down to the plane. This I can accomplish.

What is stumping me is being able to correctly render a series of dots, arrows, etc "guiding" the camera user from said start point to destination point we created.

Any advice?