Create a spider web in seconds
Two options to anchor web
Use ray casting and add some polygons objects or primitives, change some parameters and populate your scene with spider webs everywhere.
Use child object (null object or any kind) and use them as anchor points.
Easy to understand options to tweak the result
Render fast with hair module.
You can render with hair by adding a hair tag on the generator or simply edit the generator and use a sweep nurbs.