Breaking A Bridge

[MADjestic]

Hi,

I plan to break an object, but I want the pieces to start falling one by one. The first thing I thought about was animating the Glue parameter of different pieces composing the geometry. Is it possible to group certain pieces of the geometry and animate their glue parameter? Or is there any other not too exotic way to do this?

Thanks.

[craig]

Yes it is - use the Group DOP. You can group them by name (with wildcards) or by expressions (say, using their position in X and the frame number to put them into the group). Then use RBD State to animate the glue value for the group(s).

[MADjestic]

Sorry for cross-posting, but since not every odForcer regularly vists sidefx/forum I decided it is better to be consisten here as well:

...

for now I am concentrating on a simpler

[MIguel P]

You can use a group DOP with prim("../object_to_dops", $OBJID, "Cd", 0) to group the cubes, and set the rbd state, the forces, and the solver, to affect olny the group.

[MIguel P]

See this example. I think will be useful.

boxesDopsEx.hipnc

[MADjestic]

[quote name='MIguel P

[MADjestic]

btw, MIguel

If you set "Use Animated Geometry" in your Fractured Object DOP to 1- then you could get rid with a simpler expression in the Group DOP -

if(prim($OBJID, 0, "affect", 0)>10, 1, 0)

- it also won't restrict you to exactly 54 prims of the boxes geo.

Thanks for you help.

[MIguel P]

btw, MIguel

If you set "Use Animated Geometry" in your Fractured Object DOP to 1- then you could get rid with a simpler expression in the Group DOP -

if(prim($OBJID, 0, "affect", 0)>10, 1, 0)

- it also won't restrict you to exactly 54 prims of the boxes geo.

Thanks for you help.

Yes, but for this scene, with exactly 54 primitives, I think is better to use my expression, because with the option "use animated geometry" the simulation is slower.