# Sonar Pulse help **URL:** \ **Category:** Rendering\ **Tags:** Post-Processing, unreal-engine, UE4, Blueprint, question\ **Created:** [March 14, 2018, 11:37pm UTC](https://forums.unrealengine.com/t/sonar-pulse-help/419844 "2018-03-14T23:37:56Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![S-ed](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/s-ed/32/1194558_2.png) [@S-ed](https://forums.unrealengine.com/u/S-ed)\ **Post date:** [March 18, 2018, 7:27am UTC](https://forums.unrealengine.com/t/sonar-pulse-help/419844/2 "2018-03-18T07:27:14Z")
- To color it you need to feed the resulting value as alpha mask in to Lerp node. Or just make RGB vector by appending 2 float 0 to it (X-0-0). - To fire it you need to drive a parameter by blueprint, like animation graph. - To place an origin within player location you need to feed a vector of current player position as a parameter. All those questions were answered here on Answerhub or Forums, there are even tutorial on YT on that matter. > **[A new, community-hosted Unreal Engine Wiki](https://forums.unrealengine.com/t/a-new-community-hosted-unreal-engine-wiki/141494)** > > After over a year in maintenance mode, the official Unreal Engine Wiki is now permanently offline. These resources now live on a new community-run Unreal Engine Community Wiki — ue4community.wiki! You will be able to find content from the official... You could also use PP sonar effect: https://forums.unrealengine.com/development-discussion/rendering/22363-radar-sonar-pulse-post-processing-material --- _[View the full topic](https://forums.unrealengine.com/t/sonar-pulse-help/419844)._