UE4 Quick tip: ‘X-ray’ material

One of my prototypes needed an ability for the player to see certain objects through walls. I didn’t want the objects to be visible at all times, just when the player looked directly at them.

To prevent an object being obscured by the objects in front of it we just need to disable depth testing, which we can do in the object’s material. Set the material’s blend mode to Translucent and tick Disable Depth Test in the Translucency section of the material properties:


Apply the material to a mesh and you’ll be able to see it through whatever objects are in front of it. To make the effect localised I added a very simple bit of maths to the opacity node:


This calculates the distance of the current pixel from the centre of the screen and uses it to determine the opacity – so the pixels fade out as they leave a very narrow radius around the centre.

Here’s a video of the material applied to the Starter Content chair:

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s