help! how can I use rigid body??

[nonono121]

hi there!!

how can i use rigid body on a scene which a bottle fall from a shelf to the floor?? how can i set the shelf? creat a contraint for the shelf or ?? is it i hv to set the passive rigid for the floor, n active rigid rigid for the bottle? .... pls help...

趕緊功課的新手上 ?__?

[HammerChugoh]

jesus...spend 2 hours on the documentation then you can answer this question by yourself....

[CraZ3D]

如果只系個bottle fall 落地 , 點解唔試下 key frame , 好玩好多 . 又可以 當練習 .

( 除非個功課系一定要你用 Dynamics 啦 , 其實你可以開個 file 做個簡單test , 試幾野你可能已經知道點做 , active 同 passive 關系你都已經估到啦 , 加埋 fields 同 key d timing 同 d數字或者 hide/show , 你大慨都會做到 )

[nonono121]

我都試過frame by frame 咁做... 但系真系唔系咁得...因為個vase fall from shelf to the floor... 個時，個重心系唔會整系系一個位.... '如果我每幾格keyframe 就改個 pivot, 咁之前set o左o的keyframe 就會有問題.... 仲有，我唔系太明白，當我set左個vase系ACTIVE RIGID BODY o的時候，我唔可以set keyframe... ... coz.. 我想做個個場面系地震，然後個vase 震到由個牆架度fall落去地下.... .. 震個part 我已經做好，但系就唔知點樣可以整佢fall個part... 我試過將shelf and floor set 為passive rigid body.. 但系個vase就郁唔到.... :..... (

唔該幫下我手.... 我應該點set 個scene 呀？ pls help...

[CraZ3D]

唔明你問題..點解個 centre 會走位 ????
無去Modify 做 centre Pivot ???

如果之前 d keyframe 太亂的話 ,假設你之前用個 group 去 key d "震位".
建議你在之上再Group 多次 ..在開始 fall down 那格 frame就要用這個新Group , 這時第二個group 的 centre 唔會系中間的 , 你就去 Modify 做 centre Pivot 或 按 Insert 一下 拉個 centre 到 Vase 中心..由這時開始就用第二個 group 做 key frame ... (這是就你個問題的解決方法)

Dynamics 方面...簡單做法 .... 個 shelf 唔駛 加 rigid body , 你可以 keep 番之前 d key ... 到要 fall down 果下 key hide/show 或 用constant .. ; 之後再 key gravity magnitude 令個 vase fall ....
(( 按F1 就知 d rigid 同 field 點用 ..講唔倒咁多.
但我都系建議你去 用 keyframe 啦 ! ))


介唔介意話我知你讀邊間學校 ????
_________________

[nonono121]

well.. i m not in hk... actually, studying in UK.. , not much technical support from my school.. n my classmates do other kind of animation... only a few of us using maya here.. tat s y i got nobody to ask for help.. thanks.. i will try it in yr ways...

[ckw01hk]

well i think i got the point of what you are talking about the pivot problem. actually you can ignore the pivot point thing when using rigid body since maya calculates the collision and the reaction for you.
this is totally different from keyframing a vase, the point is that you cannot animate pivot point in maya. you can just keyframe the obj by translation or rotation in order to create the illusion of "changing pivot point".
for example a 45 degree clockwise rotated box is going to hit the ground, one edge or corner will hit the ground first and reaction force comes from that side making the box rotate in anti-clockwise direction. at that time the pivot point is somewhere near the centre of the obj.
while the corner on the ther side contacts the ground, pivot point may go to the current corner making the box continue to rotate in anti-clockwise direction.(don't know if you can get it or not~~~sorry for that )

for the solution, I suggest using keyframing since it is more flexible.
if u want to set key in rigid body, u can using active/passive key. make sure u know how it works in the doc.~~~good luck