Hi,guys
I had ran into a strange problem with ‘RBD Pack’ SOP Node.

I had setup 2 branchs of RBD methods in SOP, and used same DOP to sim.


In the DOP, the ‘RBD Pack Object’ turns on ‘Creat Convex Hull Per Set of Connected Primitives’ option

Strangely enough, ‘Assemble’ method gives out an appropriate result, but ‘RDBPack’ method doesn't break it up.

Did I miss something during the ‘RDB Pack’ progress?

RBD Pack is not equivalent to the Assemble SOP.
The assemble SOP creates a packed fragment primitive from each value of the ‘name’ primitive attribute.
The RBD Pack SOP creates 3 packed geometry primitives from the input wires, and is used for collapsing 3 inputs down to one geometry for easier manipulation in some SOP workflows (see also RBD Unpack, as well as Vellum Pack / Unpack). It's not intended to be used directly before sending geometry into DOPs, as it ends up giving you a single packed primitive for all of the pieces

cwhite
RBD Pack is not equivalent to the Assemble SOP.
The assemble SOP creates a packed fragment primitive from each value of the ‘name’ primitive attribute.
The RBD Pack SOP creates 3 packed geometry primitives from the input wires, and is used for collapsing 3 inputs down to one geometry for easier manipulation in some SOP workflows (see also RBD Unpack, as well as Vellum Pack / Unpack). It's not intended to be used directly before sending geometry into DOPs, as it ends up giving you a single packed primitive for all of the pieces

Thanks for the detailed explaination

I had glanced a video about mass destruction on Youtube, in that video the poster used a RBD Pack to contain ton of pieces and sent it into DOP, it worked perfectly.

I just wonder why the same procedure didn't work in my case

akirasun_sh
I had glanced a video about mass destruction on Youtube, in that video the poster used a RBD Pack to contain ton of pieces and sent it into DOP, it worked perfectly.

I just wonder why the same procedure didn't work in my case

you probably missed the part where he unpacked it using RBD Unpack to be able to use it in DOPs

tamte

akirasun_sh
I had glanced a video about mass destruction on Youtube, in that video the poster used a RBD Pack to contain ton of pieces and sent it into DOP, it worked perfectly.

I just wonder why the same procedure didn't work in my case

you probably missed the part where he unpacked it using RBD Unpack to be able to use it in DOPs

Thanks for the remind

I had rewound that video, and just like you said the poster had unpacked it at very beginning before sent into DOPs.

Honestly speaking, ‘RDB Pack’ is very convenient and memory saver for mass destruction, but with a little wired way, more like you Zip a zip into a Zip(pack things into pack)