Basic random particles - MAYA python/mel

randomParticles.py

import maya.cmds as cmds
import maya.OpenMaya as om
import random

random.seed (1234)


amountOfParticles = 5000

positionList = list()
velocityList = list()
accelList = list()

def resetFromMaster(pID):
    x = random.uniform(0,10)
    y = random.uniform(0,10)
    z = random.uniform(0,10)
    newVector = (x,y,z)
    if (len(positionList) <= pID):
        positionList.append(om.MVector(*newVector))
    else:
        positionList[pID] = om.MVector(*newVector)
    newVector = (0,0,2)
    if (len(velocityList) <= pID):
        velocityList.append(om.MVector(*newVector))
    else:
        velocityList[pID] = om.MVector(*newVector)
    newVector = (0,0,0)
    if (len(accelList) <= pID):
        accelList.append(om.MVector(*newVector))
    else:
        accelList[pID] = om.MVector(*newVector)
    
    tempP = positionList[pID]
    tempV = velocityList[pID]
    tempA = accelList[pID]
    listForMel = [tempP.x, tempP.y, tempP.z, tempV.x, tempV.y, tempV.z, tempA.x, tempA.y, tempA.z]
    return listForMel
        


def createParticles():
    tempList = list()
    
    for i in range( 0, amountOfParticles):
        resetFromMaster(i)
        x = positionList[i].x
        y = positionList[i].y
        z = positionList[i].z
        newVector = (x,y,z)
        tempList.append(newVector)
    
    cmds.particle(p=tempList,n='particleObject#')
    

def cExpression ():
    expString0 = 'string $strForPy1 = "resetFromMaster(" + particleObject2Shape.particleId + ")";'
    expString1 = 'float $resultList[] = python($strForPy1);'
    expString2 = 'particleObject2Shape.position = <<$resultList[0], $resultList[1], $resultList[2]>>; particleObject2Shape.velocity = <<$resultList[3], $resultList[4], $resultList[5]>>; particleObject2Shape.acceleration = <<$resultList[6], $resultList[7], $resultList[8]>>;'
    bigString = expString0 + expString1 + expString2
    cmds.dynExpression( 'particleObject*Shape', s=bigString, c=1)


createParticles()
cExpression()