Here's something small I've achieved with Ventilator's plugin:



Click this link
Now click this link
Then save the images to your pc, or somehow figure out a way to instantly transition between them and you can see just how amazing mesh lightmapping is and why I love this plugin so much and how cool Ventilator is for making it! If you use bsp it's going to eat your performance and you don't have the flexibility and ease of creativity with meshes

Another example:
Here
And here