# visualize moving Laserline on actor

**URL:** https://discourse.vtk.org/t/visualize-moving-laserline-on-actor/344
**Category:** Support
**Created:** [February 27, 2019, 8:07pm UTC](https://discourse.vtk.org/t/visualize-moving-laserline-on-actor/344 "2019-02-27T20:07:22Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![pettaa123](https://discourse.vtk.org/user_avatar/discourse.vtk.org/pettaa123/32/218_2.png) [@pettaa123](https://discourse.vtk.org/u/pettaa123)
#### Post date: [February 27, 2019, 8:07pm UTC](https://discourse.vtk.org/t/visualize-moving-laserline-on-actor/344/1 "2019-02-27T20:07:22Z")

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Hello, how would you render projecting a moving laserline over actors? my only idea is using a positional light and putting a mask with a slit directly in front of it.