maya instancer 一問

[風之谷]

我create 了 emitter, particle

之後particle attach 了 instancer

"instanced object" 加了 object a ,object b

請問如何可以 play timeline 時

d particle random 地噴object a ,object b 出來呢?


(以前有人教過但忘記了又試不出來 )

thanks~

[stantang]

Add a custom PP attr named "object_rand" (or whatever name you like), make sure the data type is integer or float. The add a creation expression "object_rand = rand(0,1);", finally choose the new attr under the pull down menu in ObjectIndex with the instancer.

[WildSeven]

The outline given by stantang is right, but there are something you may concern.

1) For the "object_rand" attribute, data type "float" should be used if you want to set it as per-particle attribute. Integer will not work.

2) Presumably, for 2 objects in the instancer list, the object index should be 0, and 1 respectively. Therefore, you need to set the random function to rand(0, 2) in order to output 0 or 1. rand(0,1) will always give you 0 in is case.

[stantang]

Wildseven, thanks for pointing out the errors, I didn't have Maya opened and was late at night when replied, haha my mistake. Anyway, to add to the answer, you can't even choose integer when creating PP attr now (I think it used to be available...). Second, you can add trunc() function to the rand() to round up the float to integer if you want, but it won't make a different in this case.

[風之谷]

thx alot~

試到了~