Dynamic Texture Blending

[NiloBR]

Hey guys…
I’m a shader noob and I need a little help…
how complex it is to make a shader that blend 2 textures depending on a trigger contact??
like this…

i appreciate any help u could give me…

Thanks

[NiloBR]

just to make it more clear…
something that reacts to a trigger like it was a point light… but instead of making the area brighter, it blend to another texture…