Introduction to Vizard: Loading Avatars, Random Walk, Character Actions, and Mouse Interaction

Vizard is a virtual‑reality development platform built on C/C++ and OpenGL, which can be scripted with Python; the Python layer compiles scripts to a byte‑code abstraction (LAXMI) that drives the rendering engine.

Loading avatars, objects, and backgrounds

avatar = viz.addAvatar('xxx.cfg', pos=(0,0,0), euler=(0,0,0))

viz.add('xxx.osgb', pos=(0,0,0), euler=(0,0,0))

viz.addChild('xxx.obj', pos=(-4,0,7.5))

Pigeon random walk

pigeon = viz.addAvatar('pigeon.cfg', pos=(2,0,5))

random_walk = vizact.walkTo(pos=[vizact.randfloat(1.5,2.5),0,vizact.randfloat(4.5,5.5)])

random_animation = vizact.method.state(vizact.choice([1,3], vizact.RANDOM))

random_wait = vizact.waittime(vizact.randfloat(2.0,8.0))

pigeon_idle = vizact.sequence(random_walk, random_animation, random_wait, viz.FOREVER)

pigeon.runAction(pigeon_idle)

Talking characters

def PersonTalk():

female = viz.addAvatar('vcc_female.cfg', pos=(1,0,8), euler=(-90,0,0))

male = viz.addAvatar('vcc_male2.cfg', pos=(0,0,8), euler=(90,0,0))

female.state(14)

male.state(4)

Character movement via keyboard

def roleMove():

m1 = viz.Matrix.euler(0,0,0)

dm = viz.getFrameElapsed() * speed

temp = avatar.getEuler()[0] * math.pi / 180

if viz.key.isDown('w'):

m1.preTrans([dm*math.sin(temp),0,dm*math.cos(temp)])

avatar.state(2)

elif viz.key.isDown('s'):

m1.preTrans([-dm*math.sin(temp),0,-dm*math.cos(temp)])

avatar.state(2)

elif viz.key.isDown('a'):

m1.preTrans([-dm*0.3*math.cos(temp),0,dm*0.3*math.sin(temp)])

avatar.state(12)

elif viz.key.isDown('d'):

m1.preTrans([dm*0.3*math.cos(temp),0,-dm*0.3*math.sin(temp)])

avatar.state(13)

else:

avatar.state(1)

avatar.setPosition(m1.getPosition(), viz.REL_PARENT)

Mouse movement capture

def onMouseMove(e):

global mp_x, mp_y

mp_x = e.dx

mp_y = e.dy

viz.callback(viz.MOUSE_MOVE_EVENT, onMouseMove)

The final scene combines a system‑time clock, two animated talking avatars, a third‑person roaming pigeon, keyboard‑controlled character navigation, mouse‑driven rotation and pitch, and additional 3D objects such as a vase, sky, and grass backgrounds.