Page 63 - 3D World - October 2017

TuTorials
Master destruction effects

CoLLISIoN GEoMEtrY EXPort tHE CACHE
12 Bring the volume into your DOP network: you can 13Once Houdini has calculated the simulation, you need to export the
see how to do so at 01:03:10. In the Parameter Editor, geometry cache it generates back to Maya as an Alembic file. To do this, use
make sure that Use Deforming Geometry is checked. The an Alembic ROP output driver geometry node, as shown at 01:04:10. The
Collisions tab lets you tweak the collision settings: you default settings won’t be good enough, so in the Parameter Editor, set the
can see the ones I used in the video. Check the Collision Partition Mode drop-down to Use Shape Component Of Path Attribute Value.
Guide option to display the final shape of the object that In the Partition Attribute field, give it an appropriate name. In the Face Sets
will be interacting with the wall geometry in the viewport. drop-down, select No Face Sets. This ensures your UVs are preserved.

IMPort IN MAYA display in the viewport, go to the Attribute Editor and change
14 Go back to Maya. It’s easy to assume that you can bring in the Geometry to load drop-down from Preview to Maya mesh.
the Alembic file you just generated via Cache>Alembic Cache, but Change Playback type to Once so the animation doesn’t loop. In
this doesn’t preserve the UVs. If you have V-Ray installed, you can production, most simulations are created starting at frame 1001,
use the V-Ray Proxy instead. Choose Create>V-Ray>Import proxy so to make the simulation match up with the animation of the
and navigate to the Alembic file. To make the full geometry spaceship, enter -1001 in the Start offset field.

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