Hi all,
TLDR; In Maya 2015-2018, getAttr returns stale value when used in
conjunction with an ikHandle
I’ve ventured into the depths of querying attributes at an arbitrary time..
# Examplefrom maya import cmds
cmds.getAttr("myNode.translateX", time=5)
And it has worked well so far, except for when IK is involved.
from maya import cmds
# Build Scene# o o# \ /# \ /# o#
cmds.file(new=True, force=True)
a = cmds.joint(name="Root")
cmds.move(0, 0, 20)
cmds.joint()
cmds.move(0, 0, 0)
b = cmds.joint()
cmds.move(0, 10, -20)
handle, eff = cmds.ikHandle(
solver="ikRPsolver",
startJoint=a,
endEffector=b,
)
assert cmds.getAttr(a + ".rx") == 0.0assert cmds.getAttr(a + ".rx",
time=1) == 0.0 # Cycle warning!
Suddenly, Maya throws a cycle warning. Why is that?
Furthermore, the value returned isn’t right anymore.
# Move handle
cmds.move(0, 15, -10, "|ikHandle1")
assert round(cmds.getAttr(a + ".rx"), 0) == -14.0assert cmds.getAttr(a
+ ".rx", time=1) == 0.0 # Bad value, no warning..
Where I should see -14.0 I get the previous value, 0.0. Why is that?
And so the story goes, until..
# Move root
cmds.move(0, 0, 21, a)
assert round(cmds.getAttr(a + ".rx"), 0) == -14.0assert
round(cmds.getAttr(a + ".rx", time=1), 0) == -14.0 # Correct
Viola, all values are correct. Why is that?? :O
This happens consistently across all versions of Maya, except 2015 doesn’t
throw a Cycle Warning.
Anyone stumbled upon this before?
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