'Mould growing effect' for cutscene in unity

I’m not really sure how I can explain this, but I’ll try anyway.

I’m trying to make a cutscene for my unity game, and I’d like a certain effect.

Basically, I want there to a be a dark material that spreads onto all the objects in the view, kind of like how mould grows.

My objects are pretty big, and when I assign the new material, all of it instantly turns to the new material. How can I get the effect I want?

You’d want to do this with a custom shader.

The high level is you have a shader that will change color based on the world space position and radius of a mathematical sphere passed to the shader from a script. You can give it a soft edge by blending in over the distance to the sphere’s surface, and add some noise so that it fades in with some texture to it.

To get to the point where you can do the above you’re going to have to learn a ton about shader programming first though. Look here on the forums for newbie tips and the like, but this is where I tend to send people first:

if you are using substances, might get something similar for simple version of that effect
3494386--278343--substances.gif

unless you want the darkness to start spreading from certain point or direction, and then “infects” objects as it spreads from one to another…

unless you want the darkness to start spreading from certain point or direction, and then “infects” objects as it spreads from one to another…

I would prefer this, but if it’s not possible/very hard I’m happy to go with the other