Joshua Opal Madison

Ok so I'm noticing some weired issues with the shatter node. So I'm shattering an Egg, so my process was to Model the egg using a cube and sub D's, then to try out the new shatter node (I'm familiar with the old way). What I'm finding is that once my egg hits the ground and breaks apart the individual pieces aren't acting as individual pieces it's as if there center of mass is staying the same as when it was part of the whole egg. So i end up with results like egg shelfs standing on corners and other things like that.


So is this because I am using the shatter node and not separating everything out, is it better to use a rbd fracture node to bring it in to my DOP network?

Joshua AM

OK so does the Initial Velocity of the object stay with the object through out the simulation, or does it act as an impulse velocity.


What I believe I was doing was adding initial velocity to the object causing it to continuously dance around on the ground plane once it had smashed. Now I'm trying to give the object an initial impulse to “throw” the object at the ground with an impulse node. Is this the solution for adding initial impulse to an object, if so where in the node tree do I stick the impulse node after my rbd glue object or after the rbd solver?

Thanks

Joshua AM

Hello guys,

So I am breaking open Houdini once again to check out some of the RBD, POP, and Fluid solvers. So I started with a basic egg shatter for my RBD, once I get the sim finished I plan on adding a fluid sim to it as well. But I can't even seem to get a Stable RBD solution.

I have modeled my egg shattered it brought it into a basic DOP network and threw it at the ground. The egg shatters great but then pieces never seem to settle the just dance around the screen, flipping, flopping, and floating all over them selves and the ground plane. I have seen this happen in the Past in Maya and know how to solve it there, but for the life of me I can't get it to stop dancing in Houdini. I have changed the values I am working with and a number of other things but can not seem to get the simulation to come to a rest. Here is the scene file you will have to sim it again because there is no cache.