[Q] Manipulating Objects in World Coordinate System.

Mihir Mehta (mehta++at++turing.rdd.lmsc.lockheed.com)
Sun, 25 Feb 1996 22:09:17 -0800 (PST)

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   I am thinking of doing object manipulation in world coordinate system
in the following manner.

 Lets say a path in scene graph looks like

   A -> B -> C -> D

 Where A is root and D is the actual object we want to manipulate in WCS.

 Generate the transformation matrix
   
 T1 = [A->dcs][B->dcs][C->dcs]

 T2 = Inverse(T1)

 Now lets say that I want to apply Translate(x,y,z) in WCS
 andn Rotate(h,p,r).

 Generate Matrix T3 = Translate(x,y,z)*Rotate(h,p,r)*T1

 D->dcs = T2*T3

 This doesnot look efficient at all. But I am just beginning with Performer.
 I am sure Performer provides an easier way of doing this. So please innundate
 me with efficient ways of accomplishing this task.

Thanks,

-- 
Mihir Mehta                              Address : Orgn 96-10 Bldg 255
mehta++at++stc.lockheed.com                             3251 Hanover Street
Ph  415-424-3555                                   Palo Alto, CA 94304-1191
Fax 415-354-5235

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