New paper sim

More paper stuff! Updated it, now using a SOP solver to modify the velocity. The last one was a field force which wasn't great.

Also this one projects the velocity vector onto the surface rather than just applying an opposing force like I was doing before. The velocity ends up perpendicular to the normal, with this: cross( nV, cross( nV, nN ) ). That is mixed with the original velocity to get more or less of the effect ...

In the linked .hip file there is a VIS_PROJECTION null that you can view to see what I mean...

Houdini - New cloth paper thingy! from Sam Hancock on Vimeo.

You can get the hip file from here (H11)