NextKey

Description

Moves current frame to the next key frame for the given animation parameters. If InputObjs argument is left blank (skipped), current selected and marked parameters are used.

This is the scripting equivalent of selecting Next Key from the animation pop-up menu (or pressing Ctrl+Right with the default keyboard layout).

Scripting Syntax

oDouble = NextKey( [InputObjs], [Time], [Tolerance], [Layer] );

Return Value

Returns the frame number of the next key frame as a Double. If there is no key then the following is returned:

"1.#INF" for C++, "1.#INF" for VBScript

"Number.POSITIVE_INFINITY" for JScript.

Parameters

Parameter Type Description
InputObjs String List of animatable parameters (for example "cone*/kine.local.pos").

Default Value: Currently selected and marked parameters

Time Number Move to the next key after this frame.

Default Value: Current frame

Tolerance Double Frame tolerance

Default Value: Nearest 0.5 frame (-1)

Possible Values:

Description:

>0 Get key at Frame + Tolerance
0 Key must be exactly at frame
-1 Nearest 0.5 frame
Layer Integer Animation layer

Default Value: Current animation layer (-1)

Examples

VBScript Example

'

' This example sets up some animation on the X position of a sphere, moves to the next key frame,

' prints out the key information for this parameter, removes the next key and prints out the 

' key information again.

'

' Set up an object to animate

set oGlobe = CreatePrim( "Sphere", "NurbsSurface", "MySphere" )

' Set the maximum frame number to 40

SetValue "PlayControl.Out", 40

' Set some keys on XPos at various frames

SaveKey oGlobe & ".kine.local.posx", 1, -9.0

SaveKey oGlobe & ".kine.local.posx", 10, 3.0

SaveKey oGlobe & ".kine.local.posx", 30,-3.0

SaveKey oGlobe & ".kine.local.posx", 40, 9.0

' Return to frame 1

SetValue "PlayControl.Current", 1

' Goto key at frame 10

NextKey oGlobe & "/kine.local.pos"

' Print out key info for the globe's position in X before

' removing the next key

WhereAmI oGlobe

' Remove key at frame 30 (next key)

if RemoveNextKey( oGlobe & "/kine.local.pos" ) then

	LogMessage "Successfully removed the key."

else

	LogMessage "This is the last key."

end if

' Print out key info for the globe's position in X after

' removing the next key

WhereAmI oGlobe

' Goto NextKey (at frame 40 now)

NextKey ( oGlobe & "/kine.local.pos" )

' This function removes the next key (provided that there is a next key to remove)

' and returns a Boolean value indicating whether it could remove the key or not.

function RemoveNextKey ( in_parameter )

	' Check if there is another key (if there is no next key, NextKey returns "1.#INF")

	if ( NextKey( in_parameter ) <> "1.#INF" ) then

		RemoveKey in_parameter

		RemoveNextKey = true

		exit function

	end if

	RemoveNextKey = false

end function 

' This subroutine prints out the total number of keys on the object, and then prints

' the frame number and value for each key in the collection.

sub WhereAmI( in_object )

	if TypeName( in_object ) <> "Nothing" then

		' Get the fcurve object that is attached to the XPos parameter

		set oAnimationFC = in_object.posx.Source

		' From the fcurve object you can get the list of keys

		set oFCKeys = oAnimationFC.Keys

		' Make sure there are some keys on the parameter

		if oFCKeys.Count > 0 then

			' Print the total number of keys now present on this parameter

			LogMessage "Number of keys on the " & in_object & " object: " & oFCKeys.Count

			' Loop through the collection of keys, printing out the key index & its frame number

			for each k in oFCKeys

				LogMessage "Key [" & k.Index & "] is set on Frame[" & k.Time & "] with a value of " & k.Value 

			next

		end if

	end if

end sub



' Output of above script:

'...before key was removed

'INFO : "Number of keys on the MySphere object: 4"

'INFO : "Key [0] is set on Frame[1] with a value of -9"

'INFO : "Key [1] is set on Frame[10] with a value of 3"

'INFO : "Key [2] is set on Frame[30] with a value of -3"

'INFO : "Key [3] is set on Frame[40] with a value of 9"

'

'INFO : "Successfully removed the key."

'

'...after key was removed

'INFO : "Number of keys on the MySphere object: 3"

'INFO : "Key [0] is set on Frame[1] with a value of -9"

'INFO : "Key [1] is set on Frame[10] with a value of 3"

'INFO : "Key [2] is set on Frame[40] with a value of 9"

See Also

AddFCurve RemoveAnimation RemoveAllAnimation SaveKey RemoveKey PrevKey FirstKey LastKey FCurve.Keys