[Maya-Python] driven animation curves in OpenMaya

Discussion:

p***@iconcreativestudio.com

2018-08-21 20:25:24 UTC

Hey Guys, I am a bit stuck trying to create driven (unitless) animCurves with OpenMaya

I am in maya 2017, using OpenMaya api 2.0

I am trying to use MFnAnimCurve to create multiple keyframes at the same time. this seems to work when using timed curve types (using MTimeArray as first argument) but it fails when using unitless curves and a MDoubleArray for the first argument.. Am I missing something? should i be using a different type for the first argument?

import maya.api.OpenMaya as om
import maya.api.OpenMayaAnim as oma

graph_modifier = om.MDGModifier()

m_object = om.MFnDependencyNode().create('transform', 'locator1')
node = om.MFnDependencyNode(m_object)

m_plug = node.findPlug(node.attribute('translateX'), True)
out_plug = node.findPlug(node.attribute('translateY'), True)

mfn_anim_curve = oma.MFnAnimCurve()
curve_type = mfn_anim_curve.unitlessAnimCurveTypeForPlug(m_plug)
#curve_type = mfn_anim_curve.timedAnimCurveTypeForPlug(m_plug)

anim_curve_m_object = oma.MFnAnimCurve().create(m_plug, animCurveType=curve_type)
anim_curve = oma.MFnAnimCurve(anim_curve_m_object)

in_plug = anim_curve.findPlug(anim_curve.attribute('input'), True)

graph_modifier.connect(out_plug, in_plug)
graph_modifier.doIt()

in_values = om.MDoubleArray()
out_values = om.MDoubleArray()
for x in range(5):
in_values.append(float(x))
for x in range(5):
out_values.append(float(x))

print in_values, out_values

anim_curve.addKey(1.0, 1.0)
anim_curve.addKey(2.0, 2.0)

#This Fails
anim_curve.addKeys(in_values, out_values)

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Justin Israel

2018-08-21 21:23:34 UTC

Permalink

The documentation for MFnAnimCurve.addKeys() does specify that it only
works for kAnimCurveTA, kAnimCurveTL, and kAnimCurveTU. Whereas the type
being returned by unitlessAnimCurveTypeForPlug() is kAnimCurveUL
https://goo.gl/XNcYvT

Justin

Post by p***@iconcreativestudio.com
Hey Guys, I am a bit stuck trying to create driven (unitless) animCurves with OpenMaya
I am in maya 2017, using OpenMaya api 2.0
I am trying to use MFnAnimCurve to create multiple keyframes at the same
time. this seems to work when using timed curve types (using MTimeArray as
first argument) but it fails when using unitless curves and a MDoubleArray
for the first argument.. Am I missing something? should i be using a
different type for the first argument?
import maya.api.OpenMaya as om
import maya.api.OpenMayaAnim as oma
graph_modifier = om.MDGModifier()
m_object = om.MFnDependencyNode().create('transform', 'locator1')
node = om.MFnDependencyNode(m_object)
m_plug = node.findPlug(node.attribute('translateX'), True)
out_plug = node.findPlug(node.attribute('translateY'), True)
mfn_anim_curve = oma.MFnAnimCurve()
curve_type = mfn_anim_curve.unitlessAnimCurveTypeForPlug(m_plug)
#curve_type = mfn_anim_curve.timedAnimCurveTypeForPlug(m_plug)
anim_curve_m_object = oma.MFnAnimCurve().create(m_plug,
animCurveType=curve_type)
anim_curve = oma.MFnAnimCurve(anim_curve_m_object)
in_plug = anim_curve.findPlug(anim_curve.attribute('input'), True)
graph_modifier.connect(out_plug, in_plug)
graph_modifier.doIt()
in_values = om.MDoubleArray()
out_values = om.MDoubleArray()
in_values.append(float(x))
out_values.append(float(x))
print in_values, out_values
anim_curve.addKey(1.0, 1.0)
anim_curve.addKey(2.0, 2.0)
#This Fails
anim_curve.addKeys(in_values, out_values)
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Paxton Gerrish

2018-08-21 22:00:30 UTC

Permalink

*facepalm*
Thanks man ð

Post by Justin Israel
The documentation for MFnAnimCurve.addKeys() does specify that it only
works for kAnimCurveTA, kAnimCurveTL, and kAnimCurveTU. Whereas the type
being returned by unitlessAnimCurveTypeForPlug() is kAnimCurveUL
https://goo.gl/XNcYvT
Justin

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