bake animation nParticle on locators

    Ici mon objectif est de faire une simulation avec nParticles et d'y instancier un petit rig de sphere, première étape: faire la simu avec des nParticles Ball de mm taille que les spheres finals, deuxième étapes: récupérer les position de chaque particule a chaque image, troisième étapes: réattribuer ces positions a des locators (aussi nombreux que les particles) et pour finir parenter les rigs (ou autre node non simulable), dupliqué en bon nombre, aux locators.

En image:


pph264 from colin laubry on Vimeo.

et voici le script que j'ai du écrire pour faire tout cela.

#recuperation de la derniere image
endFrame = cmds.playbackOptions(q = True, maxTime = True)

#recuperation de la premiere image
startFrame = cmds.playbackOptions(q = True, minTime = True)

#recuperation de la selection, dans l'ordre nParticle Instance de base
sel = cmds.ls(sl = True)
part = sel[0]
inst = sel[1]

#nom des futurs instances dupliques
new = ("newInstance_"+part+"_")

#alignement et freeze de l'instance de base
cmds.pointConstraint(part, inst, mo = False)
cmds.pointConstraint(part, inst, rm = True)
cmds.makeIdentity(inst, apply=True, t=1, r=1, s=1, n=0)

#pour chaque frame
for i in range(startFrame, endFrame):
    #deplacement du curseur de la timeline
    cmds.currentTime(i)
    #recuperation du nombre de particles
    nPart = cmds.nParticle(part, ct = True, q = True )
    print i
    #pour chaque particle
    for j in range(1, nPart+1):
        #test de l'existence pour pas dupliquer a chaque frame
        if cmds.objExists((new+str(j))) == 0:
            #duplication de linstance de base
            dup = cmds.duplicate(inst, n = (new+str(j)))
        #recuperation de la position de chaque particle
        posPP = cmds.nParticle(part, at = 'position', id = j, q = True )
        #Attribution de la position a linstance duplique
        cmds.setAttr((new+str(j)+".tx"), posPP[0])
        cmds.setAttr((new+str(j)+".ty"), posPP[1])
        cmds.setAttr((new+str(j)+".tz"), posPP[2])
        #creation de keyframe
        cmds.setKeyframe(new+str(j)+".tx")
        cmds.setKeyframe(new+str(j)+".ty")
        cmds.setKeyframe(new+str(j)+".tz")

English Version:

My goal is to do a nParticles simulation and to instance a rig sphere on each particle, first i make the simulation with Ball particles who they are approximate the same size of your rig. Next i get the position of each particle on each frame, after i assign this position to locators (as like the particles number) and finaly i duplicate the rig sphere and parent it to locators.

exemple:




and here the script that i made:

#get the last frame
endFrame = cmds.playbackOptions(q = True, maxTime = True)

#get the first frame
startFrame = cmds.playbackOptions(q = True, minTime = True)

#get selection, in order: nParticles, instance object
sel = cmds.ls(sl = True)
part = sel[0]
inst = sel[1]

#future name of the duplicate instance
new = ("newInstance_"+part+"_")

#align and freeze the instance
cmds.pointConstraint(part, inst, mo = False)
cmds.pointConstraint(part, inst, rm = True)
cmds.makeIdentity(inst, apply=True, t=1, r=1, s=1, n=0)

#for each frame
for i in range(startFrame, endFrame):
    #change current frame of the timeline
    cmds.currentTime(i)
    #get particle count
    nPart = cmds.nParticle(part, ct = True, q = True )
    print i
    #for each particle
    for j in range(1, nPart+1):
        #try instance existence for not duplicate on each frame
        if cmds.objExists((new+str(j))) == 0:
            #duplicate the instance
            dup = cmds.duplicate(inst, n = (new+str(j)))
        #get position for each particle
        posPP = cmds.nParticle(part, at = 'position', id = j, q = True )
        #set th eposition to duplicates instances
        cmds.setAttr((new+str(j)+".tx"), posPP[0])
        cmds.setAttr((new+str(j)+".ty"), posPP[1])
        cmds.setAttr((new+str(j)+".tz"), posPP[2])
        #set keyframe
        cmds.setKeyframe(new+str(j)+".tx")
        cmds.setKeyframe(new+str(j)+".ty")
        cmds.setKeyframe(new+str(j)+".tz")