please help

[masaki]

hi,
so we're getting pretty desperate with two glitches we're getting with animation paths...and the complete lack of responses... so here is a brief summary of our 2 main issues. if anyone has ANY ideas please let me know. thanks.

1. when using animation path with bezier mode and autorotate(ON) with the path linked to
the main view, at the onset of the animation, the orientation suddenly spikes for a
fraction of a second. this issue goes away if you turn autorotate(OFF) and manually
assign each control point rotation.

2. at the end of the animation path, the main view get's reset to origin (0,0,0) and also
the orientation is reset to (0,0,0). this issue is completely inconsistent and seems to
behave randomly and also differently across computers (i.e. on some computers the error
rarely or never happens and on others frequently). Also this problem seems to only happen
when the number of control points is high (~100+).

[farshizzo]

Can you provide a script that reproduces these issues? This is most likely a bug, but if you can provide a sample script I can try to find a work around.

[Jerry]

So forget the animation path. Why not drive the
view along the desired path using the joystick navigation method
while recording the head position and orientation every frame.
Then during the experiment translate and rotate the observer
along those coordinates manually as if you were playing back a
recording of the desired motion.

[masaki]

from viz import *
import viztask

ground = add('tut_ground.wrl')
mainView = viz.get( viz.MAIN_VIEWPOINT )

positions = [[0,0,0],[0,0,0.15],[0,0,0.3],[0,0,0.45],[0,0,0.6],[0,0,0.75],[0,0,0.9],[0,0,1.05],[0,0,1.2],[0,0,1.35],[0,0,1.5],[0,0,1.65],[0,0,1.8],[0,0,1.95],[0,0,2.1],[0,0,2.25],[0,0,2.4],[0,0,2.55],[0,0,2.7],[0,0,2.85],[0,0,3],[0,0,3.15],[-0.00189704643856282,0,3.29998800356965],[-0.00569083587854888,0,3.44994001976712],[-0.0113807614942146,0,3.59983206340683],[-0.0189659131682755,0,3.74964015889596],[-0.0284450776374817,0,3.89934034406941],[-0.0398167386866824,0,4.04890867402259],[-0.0530790773913481,0,4.19832122494145],[-0.0682299724085118,0,4.34755409792921],[-0.085267000316083,0,4.49658342282896],[-0.10418743600048,0,4.64538536204184],[-0.124988253092518,0,4.79393611433984],[-0.147666124451485,0,4.94221191867294],[-0.172217422697326,0,5.09018905796967],[-0.198638220790847,0,5.23784386293077],[-0.226924292661862,0,5.38515271581514],[-0.257071113885158,0,5.53209205421752],[-0.289073862404187,0,5.67863837483741],[-0.322927419302368,0,5.82476823723843],[-0.358626369621871,0,5.9704582675977],[-0.396165003229748,0,6.11568516244454],[-0.435537315731287,0,6.26042569238789],[-0.476737009430427,0,6.40465670583194],[-0.519757494337091,0,6.54835513267926],[-0.564591889221268,0,6.69149798802094],[-0.611233022713687,0,6.83406237581306],[-0.65967343445289,0,6.97602549253898],[-0.709905376278538,0,7.1173646308568],[-0.761920813470746,0,7.25805718323149],[-0.815711426035257,0,7.39808064555097],[-0.871268610034244,0,7.53741262072574],[-0.92858347896253,0,7.67603082227133],[-0.987646865169011,0,7.81391307787307],[-1.04844932132304,0,7.95103733293262],[-1.11098112192553,0,8.08738165409566],[-1.17523226486463,0,8.22292423276015],[-1.24119247301552,0,8.3576433885647],[-1.30885119588429,0,8.4915175728564],[-1.37819761129552,0,8.62452537213754],[-1.44922062712332,0,8.7566455114908],[-1.52190888306552,0,8.88785685798218],[-1.59625075246079,0,9.0181384240413],[-1.67223434414837,0,9.14746937081838],[-1.74984750437003,0,9.2758290115175],[-1.82907781871418,0,9.40319681470545],[-1.90991261410152,0,9.52955240759587],[-1.99233896081214,0,9.6548755793078],[-2.07634367455368,0,9.7791462840986],[-2.16191331857019,0,9.9023446445702],[-2.24903420579132,0,10.0244509548486],[-2.33769240102169,0,10.1454456837358],[-2.42787372316976,0,10.2653094778341],[-2.51956374751621,0,10.3840231646412],[-2.61274780802117,0,10.5015677556176],[-2.70741099967008,0,10.6179244492233],[-2.8035381808578,0,10.7330746339253],[-2.90111397581056,0,10.8469998911746],[-3.00012277704531,0,10.9596819983526],[-3.10054874786623,0,11.0711029316850],[-3.20237582489778,0,11.1812448691258],[-3.30558772065414,0,11.2900901932072],[-3.41016792614439,0,11.3976214938578],[-3.51609971351320,0,11.5038215711876],[-3.62336613871643,0,11.6086734382388],[-3.73195004423145,0,11.7121603237031],[-3.84183406180146,0,11.8142656746044],[-3.95300061521362,0,11.9149731589462],[-4.06543192311039,0,12.0142666683243],[-4.17911000183372,0,12.1121303205031],[-4.29401666830157,0,12.2085484619561],[-4.40892333476941,0,12.3049666034091],[-4.52383000123726,0,12.4013847448621],[-4.63873666770511,0,12.4978028863150],[-4.75364333417295,0,12.5942210277680],[-4.8685500006408,0,12.690639169221],[-4.98345666710865,0,12.7870573106740],[-5.09836333357649,0,12.8834754521270],[-5.21327000004434,0,12.9798935935799],[-5.32817666651219,0,13.0763117350329],[-5.44308333298003,0,13.1727298764859]]
rotations = [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,-0.0197823401541,-0.0395646803081,-0.083929374814,-0.151951089501,-0.276953041553,-0.433410406113,-0.632110178471,-0.965097725391,-1.28618347645,-1.77674126625,-2.21355104446,-2.83690094948,-3.36144304276,-4.07549285889,-4.6547999382,-5.42104721069,-6.11628723145,-6.82009744644,-7.52973175049,-8.242811203,-8.95811080933,-9.6739397049,-10.390291214,-11.0798664093,-11.8237514496,-12.5435218811,-13.259013176,-13.9761791229,-14.6936197281,-15.4109125137,-16.1280708313,-16.8457832336,-17.5646896362,-18.2805137634,-18.9967517853,-19.6809310913,-20.4329471588,-21.1172580719,-21.8678417206,-22.5517272949,-23.3028945923,-24.0169754028,-24.7385463715,-25.4126987457,-26.1709594727,-26.8571910858,-27.6046047211,-28.2732105255,-29.0410957336,-29.7245941162,-30.4749107361,-31.2565174103,-31.9090518951,-32.6843223572,-33.3464851379,-34.093547821,-34.7822227478,-35.4534912109,-36.2104263306,-36.8674621582,-37.651763916,-38.3268432617,-39.0805778503,-39.75831604,-40.5209617615,-41.3033027649,-41.9467315674,-42.7125434875,-43.3866958618,-44.1332626343,-44.810836792,-45.5930938721,-46.2115783691,-46.7850189209,-47.5163841248,-48.0392189026,-48.6333274841,-49.0393028259,-49.4651641846,-49.6783599854,-49.8670730591,-49.9598884583,-49.9899749756,-50.0002822876,-50.0074234009,-49.9894752502,-49.998878479,-50.0030937195,-50]



def playpath():
	path = addAnimationPath()

	for x in range (0,len(positions)):
			
		cp = add(CONTROL_POINT)
		cp.setPosition(positions[x])
		cp.translatemode(BEZIER)
		cp.rotatemode(BEZIER)
		#cp.rotate(rotations[x],0,0)

		path.add(cp,x)
			
	path.autorotate(ON)	#if i comment this out and use cp.rotate(rotations[x],0,0) above the first glitch goes away
	path.speed(8)
	path.translatemode(BEZIER)
	path.rotatemode(BEZIER)

	mainView.link(path)
	path.play()


def delaystart():
	yield viztask.waitTime(2)
	playpath()
viztask.schedule(delaystart())

go()

[masaki]

couple things that help (sometimes).
the glitch at the end of the path seems to happen more if the number of control points is over 100. so if i change " for x in range (0,len(positions)):" to "for x in range (0,len(positions)-1 ):" it helps a little...but it is still inconsistent, we've also tried -1, -2, etc.
jerry - we can't do the joystick navigation method, too inaccurate. what i'm doing now is playing back all of the animation paths (hoping that i get a clean set) and logging the position and orientation and then creating a read-in file and just using a timer with setposition and seteuler to play it back....but difficult to get a clean set without a glitch...

[Jerry]

This works for me. Ignore the last control point to keep it
from returning to the origin.

from viz import *
import viztask

ground = add('tut_ground.wrl')

positions = [[0,0,0],[0,0,0.15],[0,0,0.3],[0,0,0.45],[0,0,0.6],[0,0,0.75],[0,0,0.9],[0,0,1.05],[0,0,1.2],[0,0,1.35],[0,0,1.5],[0,0,1.65],[0,0,1.8],[0,0,1.95],[0,0,2.1],[0,0,2.25],[0,0,2.4],[0,0,2.55],[0,0,2.7],[0,0,2.85],[0,0,3],[0,0,3.15],[-0.00189704643856282,0,3.29998800356965],[-0.00569083587854888,0,3.44994001976712],[-0.0113807614942146,0,3.59983206340683],[-0.0189659131682755,0,3.74964015889596],[-0.0284450776374817,0,3.89934034406941],[-0.0398167386866824,0,4.04890867402259],[-0.0530790773913481,0,4.19832122494145],[-0.0682299724085118,0,4.34755409792921],[-0.085267000316083,0,4.49658342282896],[-0.10418743600048,0,4.64538536204184],[-0.124988253092518,0,4.79393611433984],[-0.147666124451485,0,4.94221191867294],[-0.172217422697326,0,5.09018905796967],[-0.198638220790847,0,5.23784386293077],[-0.226924292661862,0,5.38515271581514],[-0.257071113885158,0,5.53209205421752],[-0.289073862404187,0,5.67863837483741],[-0.322927419302368,0,5.82476823723843],[-0.358626369621871,0,5.9704582675977],[-0.396165003229748,0,6.11568516244454],[-0.435537315731287,0,6.26042569238789],[-0.476737009430427,0,6.40465670583194],[-0.519757494337091,0,6.54835513267926],[-0.564591889221268,0,6.69149798802094],[-0.611233022713687,0,6.83406237581306],[-0.65967343445289,0,6.97602549253898],[-0.709905376278538,0,7.1173646308568],[-0.761920813470746,0,7.25805718323149],[-0.815711426035257,0,7.39808064555097],[-0.871268610034244,0,7.53741262072574],[-0.92858347896253,0,7.67603082227133],[-0.987646865169011,0,7.81391307787307],[-1.04844932132304,0,7.95103733293262],[-1.11098112192553,0,8.08738165409566],[-1.17523226486463,0,8.22292423276015],[-1.24119247301552,0,8.3576433885647],[-1.30885119588429,0,8.4915175728564],[-1.37819761129552,0,8.62452537213754],[-1.44922062712332,0,8.7566455114908],[-1.52190888306552,0,8.88785685798218],[-1.59625075246079,0,9.0181384240413],[-1.67223434414837,0,9.14746937081838],[-1.74984750437003,0,9.2758290115175],[-1.82907781871418,0,9.40319681470545],[-1.90991261410152,0,9.52955240759587],[-1.99233896081214,0,9.6548755793078],[-2.07634367455368,0,9.7791462840986],[-2.16191331857019,0,9.9023446445702],[-2.24903420579132,0,10.0244509548486],[-2.33769240102169,0,10.1454456837358],[-2.42787372316976,0,10.2653094778341],[-2.51956374751621,0,10.3840231646412],[-2.61274780802117,0,10.5015677556176],[-2.70741099967008,0,10.6179244492233],[-2.8035381808578,0,10.7330746339253],[-2.90111397581056,0,10.8469998911746],[-3.00012277704531,0,10.9596819983526],[-3.10054874786623,0,11.0711029316850],[-3.20237582489778,0,11.1812448691258],[-3.30558772065414,0,11.2900901932072],[-3.41016792614439,0,11.3976214938578],[-3.51609971351320,0,11.5038215711876],[-3.62336613871643,0,11.6086734382388],[-3.73195004423145,0,11.7121603237031],[-3.84183406180146,0,11.8142656746044],[-3.95300061521362,0,11.9149731589462],[-4.06543192311039,0,12.0142666683243],[-4.17911000183372,0,12.1121303205031],[-4.29401666830157,0,12.2085484619561],[-4.40892333476941,0,12.3049666034091],[-4.52383000123726,0,12.4013847448621],[-4.63873666770511,0,12.4978028863150],[-4.75364333417295,0,12.5942210277680],[-4.8685500006408,0,12.690639169221],[-4.98345666710865,0,12.7870573106740],[-5.09836333357649,0,12.8834754521270],[-5.21327000004434,0,12.9798935935799],[-5.32817666651219,0,13.0763117350329],[-5.44308333298003,0,13.1727298764859]]
rotations = [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,-0.0197823401541,-0.0395646803081,-0.083929374814,-0.151951089501,-0.276953041553,-0.433410406113,-0.632110178471,-0.965097725391,-1.28618347645,-1.77674126625,-2.21355104446,-2.83690094948,-3.36144304276,-4.07549285889,-4.6547999382,-5.42104721069,-6.11628723145,-6.82009744644,-7.52973175049,-8.242811203,-8.95811080933,-9.6739397049,-10.390291214,-11.0798664093,-11.8237514496,-12.5435218811,-13.259013176,-13.9761791229,-14.6936197281,-15.4109125137,-16.1280708313,-16.8457832336,-17.5646896362,-18.2805137634,-18.9967517853,-19.6809310913,-20.4329471588,-21.1172580719,-21.8678417206,-22.5517272949,-23.3028945923,-24.0169754028,-24.7385463715,-25.4126987457,-26.1709594727,-26.8571910858,-27.6046047211,-28.2732105255,-29.0410957336,-29.7245941162,-30.4749107361,-31.2565174103,-31.9090518951,-32.6843223572,-33.3464851379,-34.093547821,-34.7822227478,-35.4534912109,-36.2104263306,-36.8674621582,-37.651763916,-38.3268432617,-39.0805778503,-39.75831604,-40.5209617615,-41.3033027649,-41.9467315674,-42.7125434875,-43.3866958618,-44.1332626343,-44.810836792,-45.5930938721,-46.2115783691,-46.7850189209,-47.5163841248,-48.0392189026,-48.6333274841,-49.0393028259,-49.4651641846,-49.6783599854,-49.8670730591,-49.9598884583,-49.9899749756,-50.0002822876,-50.0074234009,-49.9894752502,-49.998878479,-50.0030937195,-50]



def playpath():
	path = addAnimationPath()

	yield viztask.waitKeyDown(' ')
	
	for x in range (0,len(positions)-1):
			
		cp = add(CONTROL_POINT)
		cp.setPosition(positions[x])
		cp.rotate(rotations[x],0,0)

		path.add(cp,x)
			
	path.speed(8)
	path.translatemode(BEZIER)
	MainView.link(path)
	path.loop(OFF)
	path.play()


def delaystart():
	yield viztask.waitTime(2)
	playpath()
viztask.schedule(playpath())

go()

[farshizzo]

Here is a workaround for the glitch at the beginning of the animation. This will be fixed in the next release:

from viz import *
import viztask

ground = add('tut_ground.wrl')
mainView = viz.get( viz.MAIN_VIEWPOINT )

positions = [[0,0,0],[0,0,0.15],[0,0,0.3],[0,0,0.45],[0,0,0.6],[0,0,0.75],[0,0,0.9],[0,0,1.05],[0,0,1.2],[0,0,1.35],[0,0,1.5],[0,0,1.65],[0,0,1.8],[0,0,1.95],[0,0,2.1],[0,0,2.25],[0,0,2.4],[0,0,2.55],[0,0,2.7],[0,0,2.85],[0,0,3],[0,0,3.15],[-0.00189704643856282,0,3.29998800356965],[-0.00569083587854888,0,3.44994001976712],[-0.0113807614942146,0,3.59983206340683],[-0.0189659131682755,0,3.74964015889596],[-0.0284450776374817,0,3.89934034406941],[-0.0398167386866824,0,4.04890867402259],[-0.0530790773913481,0,4.19832122494145],[-0.0682299724085118,0,4.34755409792921],[-0.085267000316083,0,4.49658342282896],[-0.10418743600048,0,4.64538536204184],[-0.124988253092518,0,4.79393611433984],[-0.147666124451485,0,4.94221191867294],[-0.172217422697326,0,5.09018905796967],[-0.198638220790847,0,5.23784386293077],[-0.226924292661862,0,5.38515271581514],[-0.257071113885158,0,5.53209205421752],[-0.289073862404187,0,5.67863837483741],[-0.322927419302368,0,5.82476823723843],[-0.358626369621871,0,5.9704582675977],[-0.396165003229748,0,6.11568516244454],[-0.435537315731287,0,6.26042569238789],[-0.476737009430427,0,6.40465670583194],[-0.519757494337091,0,6.54835513267926],[-0.564591889221268,0,6.69149798802094],[-0.611233022713687,0,6.83406237581306],[-0.65967343445289,0,6.97602549253898],[-0.709905376278538,0,7.1173646308568],[-0.761920813470746,0,7.25805718323149],[-0.815711426035257,0,7.39808064555097],[-0.871268610034244,0,7.53741262072574],[-0.92858347896253,0,7.67603082227133],[-0.987646865169011,0,7.81391307787307],[-1.04844932132304,0,7.95103733293262],[-1.11098112192553,0,8.08738165409566],[-1.17523226486463,0,8.22292423276015],[-1.24119247301552,0,8.3576433885647],[-1.30885119588429,0,8.4915175728564],[-1.37819761129552,0,8.62452537213754],[-1.44922062712332,0,8.7566455114908],[-1.52190888306552,0,8.88785685798218],[-1.59625075246079,0,9.0181384240413],[-1.67223434414837,0,9.14746937081838],[-1.74984750437003,0,9.2758290115175],[-1.82907781871418,0,9.40319681470545],[-1.90991261410152,0,9.52955240759587],[-1.99233896081214,0,9.6548755793078],[-2.07634367455368,0,9.7791462840986],[-2.16191331857019,0,9.9023446445702],[-2.24903420579132,0,10.0244509548486],[-2.33769240102169,0,10.1454456837358],[-2.42787372316976,0,10.2653094778341],[-2.51956374751621,0,10.3840231646412],[-2.61274780802117,0,10.5015677556176],[-2.70741099967008,0,10.6179244492233],[-2.8035381808578,0,10.7330746339253],[-2.90111397581056,0,10.8469998911746],[-3.00012277704531,0,10.9596819983526],[-3.10054874786623,0,11.0711029316850],[-3.20237582489778,0,11.1812448691258],[-3.30558772065414,0,11.2900901932072],[-3.41016792614439,0,11.3976214938578],[-3.51609971351320,0,11.5038215711876],[-3.62336613871643,0,11.6086734382388],[-3.73195004423145,0,11.7121603237031],[-3.84183406180146,0,11.8142656746044],[-3.95300061521362,0,11.9149731589462],[-4.06543192311039,0,12.0142666683243],[-4.17911000183372,0,12.1121303205031],[-4.29401666830157,0,12.2085484619561],[-4.40892333476941,0,12.3049666034091],[-4.52383000123726,0,12.4013847448621],[-4.63873666770511,0,12.4978028863150],[-4.75364333417295,0,12.5942210277680],[-4.8685500006408,0,12.690639169221],[-4.98345666710865,0,12.7870573106740],[-5.09836333357649,0,12.8834754521270],[-5.21327000004434,0,12.9798935935799],[-5.32817666651219,0,13.0763117350329],[-5.44308333298003,0,13.1727298764859]]
rotations = [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,-0.0197823401541,-0.0395646803081,-0.083929374814,-0.151951089501,-0.276953041553,-0.433410406113,-0.632110178471,-0.965097725391,-1.28618347645,-1.77674126625,-2.21355104446,-2.83690094948,-3.36144304276,-4.07549285889,-4.6547999382,-5.42104721069,-6.11628723145,-6.82009744644,-7.52973175049,-8.242811203,-8.95811080933,-9.6739397049,-10.390291214,-11.0798664093,-11.8237514496,-12.5435218811,-13.259013176,-13.9761791229,-14.6936197281,-15.4109125137,-16.1280708313,-16.8457832336,-17.5646896362,-18.2805137634,-18.9967517853,-19.6809310913,-20.4329471588,-21.1172580719,-21.8678417206,-22.5517272949,-23.3028945923,-24.0169754028,-24.7385463715,-25.4126987457,-26.1709594727,-26.8571910858,-27.6046047211,-28.2732105255,-29.0410957336,-29.7245941162,-30.4749107361,-31.2565174103,-31.9090518951,-32.6843223572,-33.3464851379,-34.093547821,-34.7822227478,-35.4534912109,-36.2104263306,-36.8674621582,-37.651763916,-38.3268432617,-39.0805778503,-39.75831604,-40.5209617615,-41.3033027649,-41.9467315674,-42.7125434875,-43.3866958618,-44.1332626343,-44.810836792,-45.5930938721,-46.2115783691,-46.7850189209,-47.5163841248,-48.0392189026,-48.6333274841,-49.0393028259,-49.4651641846,-49.6783599854,-49.8670730591,-49.9598884583,-49.9899749756,-50.0002822876,-50.0074234009,-49.9894752502,-49.998878479,-50.0030937195,-50]



def playpath():
	path = addAnimationPath()

	for x in range (0,len(positions)):
			
		cp = add(CONTROL_POINT)
		cp.setPosition(positions[x])
		cp.translatemode(BEZIER)
		cp.rotatemode(BEZIER)
		#cp.rotate(rotations[x],0,0)

		path.add(cp,x)
			
	path.speed(8)
	path.translatemode(BEZIER)
	path.rotatemode(BEZIER)

	path.play()
	
	#Wait one frame before turning autorotate on and linking view to path
	yield None
	path.autorotate(ON)
	mainView.link(path)


def delaystart():
	yield viztask.waitTime(2)
	yield playpath()
viztask.schedule(delaystart())

go()

The trick is to way a frame before turning autorotate on and linking the view to the path.

I haven't looked into the issue with the view resetting to the origin. I'll get back to you on that.

[masaki]

thanks for the replies guys.
farshid - i'll try your work around tomorrow for the initial glitch
jerry - that work around i've tried many times, but if you run a sequence of trials with multiple paths, it stops working and it's always inconsistent, which means we definitely can't use in a fmri experiment.

[farshizzo]

I've made some fixes to the animation path that should prevent the resetting to origin bug. Unfortunately, there is no workaround for this, so you will need to wait for the next release. If you need this fix urgently, email me at lashkari@worldviz.com and I can provide you an update.