Alembic Animation + Grain Collision

[ItsBwalt]

Hi Everyone,

 

I have a scene I am working on where I have an alembic sequence of an animated necklace falling onto a floor as if its underwater.  I have imported the Alembic sequence by using a geometry node, deleting the File sop, and putting in an Alembic SOP and pointing it to the abc file. I then have an Unpack node after that followed by an attribcreate node that the Static Object shelf tool created.

 

I then have a dry sand simulation on a floor object and when the necklace comes down, it just is not interacting with the grains. It goes right through. Am I missing something? Do I need to convert the unpack to geometry? I am very new to houdini so sorry for the noobness! I did check the normals on the unpacked version and they are facing outwards. If I middle click the unpack node it says I have 91k points, 167 primatives, 353k vertices, and 167 polygon soups. No idea what that means but I think it's working correctly? I just can't get the grain to see it and I definitely have it set as a static object in my DOP Network.

Any idea? Do I need to somehow convert the necklace to polygons after the unpack? I attached some screen shots to show my network.

 

-Bret

 

 

[johner]

Try using the Deforming Object shelf tool instead of Static Object.  That should create a VDB collision volume and point velocities for the collision object.

[merlino]

Personally when I import an alembic the first thing I do is to place a "Convert" node and then a "Clean" ... then I work with it.

[ItsBwalt]

Well I fixed it, thanks for the help guys.

 

For anyone who was wondering, I simply toggled on "Use Deforming Geometry" in the Static Object node

 

Thanks again guys, this forum is awesome