Returns a script of Python statements that can be executed to create the keyframe. To run the script, use either Python’s exec or execfile functions.

Here is an example of saving the output to a file and then loading it back into Houdini:

# Get a reference to the target keyframe.
tx_parm = hou.parm("/obj/geo1/tx")
key = tx_parm.keyframes()[0]

# Execute asCode and write the output script to file.
script = key.asCode()
f = open("create_key.py", "w")
f.write(script)
f.close()

# Execute the script.  The new keyframe will be stored 
# in the 'hou_keyframe' variable.
execfile("create_key.py")

# Commit the keyframe back into the node parameter.
tx_parm.setKeyframe(hou_keyframe)

Here is an example of saving the output into a function and then calling it in Houdini:

# Get a reference to the target keyframe.
tx_parm = hou.node("/obj/geo1").Parm("tx")
key = tx_parm.keyframes()[0]

# Execute asCode and write the function definition to file.
func = key.asCode(function_name="createKeyframe")
f = open("keylib.py", "w")
f.write(func)
f.close()

# Call the function definition.
import keylib
hou_keyframe = keylib.createKeyframe()

# Commit the keyframe back into the node parameter.
tx_parm.setKeyframe(hou_keyframe)

Returns the keyframe’s expression. For example, in cases where the keyframe has had two values set the interpolating function is returned e.g. “bezier()”, “spline()” etc.

This function raises hou.KeyframeValueNotSet if an expression has not been set.

See setExpression() and isExpressionSet().

Returns the keyframe’s expression’s language.

This function raises hou.KeyframeValueNotSet if an expression language has not ben set.

See setExpression(), and isExpressionLanguageSet().

Returns the keyframe’s frame number.

This function raises hou.KeyframeValueNotSet if the frame or time has not been set.

See setFrame() and setTime().

Returns whether the keyframe expression’s language is set.

See setExpression() and expressionLanguage().

Returns whether the keyframe’s expression is set.

See setExpression() and expression().

Returns whether the keyframe’s time is set.

See setTime() and time().

Sets the keyframe’s expression and language.

This function raises TypeError if language is not a value from hou.exprLanguage.

See expression(), expressionLanguage(), isExpressionSet(), isExpressionLanguageSet().

Sets the keyframe’s frame number. Using the number of frames per second (hou.fps()), setting the frame number also sets the time. For example, with an fps of 24, then setting the frame number to 49 will set the time to 2 seconds.

See frame().

Sets the keyframe’s time in seconds. Using the number of frames per second (hou.fps()), setting the time also sets the frame number. For example, with an fps of 24, then setting the time to 2 seconds will set the frame number to 49.

See time().

Returns the keyframe’s time in seconds.

This function raises hou.KeyframeValueNotSet if the time or frame has not been set.

See setTime() and setFrame().