Random Walk

#******************************************************
# Add a random walk animation to selected objects
# - random_walk.py
# - Give Selected Objects a simple random
#   animation
# - By Mark Caldwell
# - Version 0.1
# - 30th April 2006
# - Tested with Vue 5 Infinite 5.10 and Vue 6 Infinite Pre Release
#
# How to use in 4 easy steps
#
# 1. Download this file onto your computer
#
# 2. Edit the configuration variables below
#
# 3. Select Objects to be Replace in Vue Infinite
#
# 4. Then run script and wait for it to work
#    To run it go to Python -> Run Python Script
#    Then locate the file on your computer
#
#******************************************************
 
def RandomWalk (objprop,i,accxmin,accxmax,accymin,accymax,acczmin,acczmax):
    vx=random.uniform(accxmin,accxmax)
    vy=random.uniform(accymin,accymax)
    vz=random.uniform(acczmin,acczmax)
    vel=[vx,vy,vz]
    objprop=UpdateObj (objprop,i,vel)
    return objprop
 
def UpdateObj (objprop,i,vel):
    objprop[i][0]=objprop[i][0]+vel[0]
    objprop[i][1]=objprop[i][1]+vel[1]
    objprop[i][2]=objprop[i][2]+vel[2]
    return objprop
 
import random
 
#----------------------------------------------
# Configuration: Set these to alter end result
#----------------------------------------------
 
# Frames to generate
start=0     # First frame of animation
stop=101    # Last frame of animation if step divides into stop add 1 to get a frame on last step
step=10     # Number of frames between key frames
 
# Starting Velocity of objects
velsxmin=-1  # Starting Minimum Velocity in the x direction
velsxmax=1   # Starting Maximum Velocity in the x direction
velsymin=-1  # Starting Maximum Velocity in the y direction
velsymax=1   # Starting Maximum Velocity in the y direction
velszmin=-1  # Starting Maximum Velocity in the z direction
velszmax=1   # Starting Maximum Velocity in the z direction
 
# Random Walk accelerations applied at a key frame
accxmin=-20  # Minimum Acceleration the x direction
accxmax=20   # Maximum Acceleration the x direction
accymin=-20  # Minimum Acceleration the y direction
accymax=20   # Maximum Acceleration the y direction
acczmin=-20   # Minimum Acceleration the z direction
acczmax=20   # Maximum Acceleration the z direction
 
#----------------------------------------------
# Internal Variables Set Up: Don't alter these
#----------------------------------------------
 
obj=[]
objprop=[]
ran = random.Random()
countobj=CountSelectedObjects()
 
#----------------------------------------------
# Find Selected Objects
#----------------------------------------------
 
for i in range(0,countobj):
    object=GetSelectedObjectByIndex(i)
    obj.append(object)
    vx=random.uniform(velsxmin,velsxmax)
    vy=random.uniform(velsymin,velsymax)
    vz=random.uniform(velszmin,velszmax)
    v=[vx,vy,vz]
    objprop.append(v)
 
#----------------------------------------------
# Add Plants
#----------------------------------------------
 
for j in range(start+step,stop,step):
    SetCurrentFrame (j)
    for i in range(0,countobj):
        object=obj[i]
        objprop=RandomWalk (objprop,i,accxmin,accxmax,accymin,accymax,acczmin,acczmax)
        object.Move(objprop[i][0],objprop[i][1],objprop[i][2])