Toggling night vision during gameplay

The effect can be turned on and off at runtime by changing the Intensity parameter.

Step 1: Create a Dynamic Material Instance

In your character Blueprint, on Event BeginPlay:

1. Add a Create Dynamic Material Instance node and set its Parent to a preset.
2. Save the result in a variable, for example NV_Material.
3. Get your Camera Component and call Add or Update Blendable, with NV_Material as the Object and Weight set to 1.
4. Call Set Scalar Parameter Value on NV_Material with Parameter Name Intensity and Value 0, so the effect starts off.

Step 2: Toggle it

On your input event:

1. Call Set Scalar Parameter Value on NV_Material.
2. Set Parameter Name to Intensity.
3. Use 1 to turn it on and 0 to turn it off.

Smooth transition

For a smooth power-on effect, drive Intensity with a Timeline that goes from 0 to 1 over about 0.5 seconds. Play it forward to turn on and reverse to turn off.

Switching presets at runtime

Static Switches cannot change at runtime. To switch to a preset with different modules, create a new Dynamic Material Instance from that preset and call Add or Update Blendable again. Scalar and color parameters, however, can be changed at any time.