Problems with intervals using functions

Scripting Issues
#1

Hi

I need to create a LerpPosHprInterval which uses a function to change the pos, and, following the examples that are explained in the manual, I wrote this very basic code:


interval=node.posHprInterval(1, pos=ChangePos,hpr=(1,1,1))
interval.start(0,1)
def ChangePos():
    return (1,1,1)

But it doesn’t work: the interval doen’t start except if I don’t use a function for the position.
So, my issue is this: how can I do a working hpr pos interval using functions?

Thanks in advance

#2

could you post the code and model??
that could help

#3

Hmm, there does appear to be a bug in the interval code here. Looks like some code rot that has gone undetected for a while; I guess this feature isn’t often used.

I’ll investigate.

David

#4

Ah, I see the problem. Not code rot at all, just an undocumented design limitation.

When you use a function like this, you have to wrap the interval inside a Sequence or Parallel or something–it won’t play directly. So just do this:

interval=Sequence(node.posHprInterval(1, pos=ChangePos,hpr=(1,1,1)))

David

#5

Thak you! It works!

#6

David, your suggestion is right, but it doesn’t close my issue.
In fact I need to create an hpr pos interval which moves the node following a curve line.
What should I do?

#7

You can use MopathInterval. See here -> panda3d.org/manual/index.php/Motion_Paths

#8

I have read about it but I need to generate the path by a python function that allows me to set curve path to an object and not by importing it from egg files.
Is there a faster way or the Mopathnterval is the only solution?

#9

The easiest and simple way is to specify posHprIntervals between all points. Put them into one Sequence and just play it.

maybe something like this:

interval1 = node.posHprInterval(1, pos = point1Pos, hpr = (1,1,1))
interval2 = node.posHprInterval(1, pos = point2Pos, hpr = (1,1,1))

seq = Sequence(interval1, interval2)
seq.play()
#10

or, in case you want to use mopath… feel free to look at my snippset

discourse.panda3d.org/viewtopic.php?t=9246

just create an instance of that class, add as many points as you want, and use getNodepath. the nodepath you get can directly be fed to the mopath interval.

#11

the sequence gives me this error:

StandardError: using deprecated CInterval.play() interface
#12

It was a typo. Call start() instead of play().

David

#13

ThomasEgi, thanks, it works

#14

Yes, calling start instead of play it works, but I think I’ll use mopath because I need to define a curve and with sequences it seems harder.
Thanks at all