Can I apply post processing only to areas lit by a specific light source?

[VladDimitrov]

I’m trying to post process (saturation specifically) only the parts of the world that are lit by a light source like a flashlight or a spotlight. Is there a way to get a mask of only the light source, or get at this info is any other way to use in post processing?

Most of the information I found was dealing with custom stencils which as far as I understand apply to whole objects. Or custom depth which doesn’t seem like it helps since its applied the whole scene.

I basically want to post process only the area of the scene that is lit by a specific light source.

Any advice would be awesome, thanks!

[ClockworkOcean]

Try color correction regions

Color Correct Regions

at least is designed to focus on one area.

It is also totally possible to code a PP material to work ‘back to front’ and also only focus on one area

Localized Post-Process Effects

Hi! I am trying to achieve a localized post-process effect, as is shown on this (old) tutorial page: [3D Modeling & Texturing: [Unreal Engine 4] Localized Post-Process Effects][1] However, I simply can’t get it to function properly. I am using this blueprint and as far as I understand, I need to link my effect to ‘SphereCenter’ but it simply stays black no matter what I do and similarly, the outside stays in gray mist. [V5qEO9IuPhoM0kQU90M_ht1Y3_GSQnblnLQWjLltEq_PPFZhMYa5UA9cKLNnd7PiIQKDya6…

[BananableOffense]

Deferred rendering doesn’t have individual light data that can be exploited within buffers.
You could make a mesh in the shape of the lights cone and use a custom stencil with that.
Or, you could use the world position and compare it to a manually provided light position/vector to manually recalculate the lighting in the post process based on the length and direction of that vector.