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2014-10-04T21:23:01Z

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{{Page/Header|2.5|Doc:2.5/Manual/Animation/Editing Curves|Doc:2.5/Manual/Animation/Drivers}}

=F-Curve Modifiers=
F-Curve modifiers are similar to object modifiers, in that they add non-destructive effects, that can be adjusted at any time, and layered to create more complex effects.

==Adding a Modifier==
[[File:Doc-26-Manual-Animation-Graph_Editor_Modifiers_Adding.png|frame|right|The F-curve modifier panel.]]
The F-curve modifier panel is located in the Properties panel. Select a curve by selecting one of its curve points, or by selecting the channel list. Click on the {{Button|Add Modifier}} button and select a modifier.

To add spin to an object or group, select the object/group and add a keyframe to
the axis of rotation (x,y, or z)

Go to the Graph Editor.....make sure the f-curves properties panel is visible
(View > Properties)

>Add Modifier > (e.g.) Generator

;{{Literal|Copy F-Modifiers}} button
:Copy the F-Modifier(s) of the active F-Curve.

;{{Literal|Paste F-Modifiers}} button
:Adds copied F-Modifiers to the selected F-Curves.

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==Common Interface==
All of modifiers have common the top and bottom parts of their panel.

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''Top'' (from left to right):
[[File:Doc-26-Manual-Animation-Graph_Editor_Modifiers_Common_Elements_top.png|frame|right|Common top interface elements for all modifiers.]]
;A small arrow
:This control allows you to show/hide the modifier settings.

;The modifier type
:This is just static text showing you what this modifier is…

;{{Literal|Mute modifier}} button
: Enables/disables modifier evaluation for the F-curve.

;The “X” control
: This will remove from the {{Literal|Modifiers}} panel the modifier.
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''Bottom'' (from up to down):
[[File:Doc-26-Manual-Animation-Graph_Editor_Modifiers_Common_Elements.png|frame|right|Common bottom interface elements for all modifiers.]]
;{{Literal|Restrict Frame Range}}
:F-Curve Modifier is only applied for the specified frame range to help mask off effects in order to chain them.
:;{{Literal|Start}}
::Frame that modifier’s influence starts (if Restrict Frame Range is in use).
:;{{Literal|End}}
::Frame that modifier’s influence ends (if Restrict Frame Range is in use).
:;{{Literal|In}}
::Number of frames from start frame for influence to take effect.
:;{{Literal|Out}}
::Number of frames from end frame for influence to fade out.

;{{Literal|Use Influence}}
:F-Curve Modifier’s effects will be tempered by a default factor.
:;{{Literal|Influence}}
::Amount of influence F-Curve Modifier will have when not fading in/out.
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==Types of Modifiers==

===Generator===
[[File:Doc-26-Manual-Animation-Graph_Editor_Modifiers_Generator.png|thumb|right|500px|The Generator modifier.]]
Generator creates a Factorized or Expanded Polynomial function. These are basic mathematical formulas that represent lines, parabolas, and other more complex curves, depending on the values used.

;{{Literal|Additive}}
:This option causes the modifier to be added to the curve, instead of replacing it by default.
;{{Literal|Poly Order}}
:Specify the order of the polynomial, or the highest power of ‘x’ for this polynomial. (number of coefficients - 1).

Change the Coefficient values to change the shape of the curve. See [http://en.wikipedia.org/wiki/Polynomial The Wikipedia Page] for more information on polynomials.
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===Built-in Function===
[[File:Doc-26-Manual-Animation-Graph_Editor_Modifiers_Built-in_Function.png|thumb|right|500px|The Built-in Function modifier.]]
These are additional formulas, each with the same options to control their shape. Consult mathematics reference for more detailed information on each function.
*Sine
*Cosine
*Tangent
*Square Root
*Natural Logarithm
*Normalized Sine (sin(x)/x)

;{{Literal|Amplitude}}
:Adjusts the Y scaling
;{{Literal|Phase Multiplier}}
:Adjusts the X scaling
;{{Literal|Phase Offset}}
:Adjusts the X offset
;{{Literal|Value Offset}}
:Adjusts the Y offset
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===Envelope===
[[File:Doc-26-Manual-Animation-Graph_Editor_Modifiers_Envelope.png|frame|right|The Envelope modifier.]]
Allows you to adjust the overall shape of a curve with control points.

;{{Literal|Reference Value}}
:Set the Y value the envelope is centered around.
;{{Literal|Min}}
:Lower distance from Reference Value for 1:1 default influence.
;{{Literal|Max}}
:Upper distance from Reference Value for 1:1 default influence.

;{{Literal|Add Point}}
:Add a set of control points. They will be created at the current frame.
;{{Literal|Fra:}}
:Set the frame number for the control point.
;{{Literal|Min}}
:Specifies the lower control point's position.
;{{Literal|Max}}
:specifies the upper control point's position.
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===Cycles===
[[File:Doc-26-Manual-Animation-Graph_Editor_Modifiers_Cycles.png|thumb|right|500px|The Cycles modifier.]]
Cycles allows you add cyclic motion to a curve that has 2 or more control points. The options can be set for before and after the curve.

;{{Literal|Cycle Mode}}
:{{Literal|Repeat Motion}}
::Repeats the curve data, while maintaining their values each cycle.
:{{Literal|Repeat with Offset}}
::Repeats the curve data, but offsets the value of the first point to the value of the last point each cycle.
:{{Literal|Repeat Mirrored}}
::Each cycle the curve data is flipped across the X-axis.

;{{Literal|Before/After Cycles}}
:Set the number of times to cycle the data. A value of 0 cycles the data infinitely.
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===Noise===
[[File:Doc-26-Manual-Animation-Graph_Editor_Modifiers_Noise.png|thumb|right|500px|The Noise modifier.]]
Modifies the curve with a noise formula. This is useful for creating subtle or extreme randomness to animated movements, like camera shake.

;{{Literal|Blend Type}}
:{{Literal|Replace}}
::Adds a -.5 to .5 range noise function to the curve.
:{{Literal|Add}}
::Adds a 0 to 1 range noise function to the curve.
:{{Literal|Subtract}}
::Subtracts a 0 to 1 range noise function to the curve.
:{{Literal|Multiply}}
::Multiplies a 0 to 1 range noise function to the curve.

;{{Literal|Scale}}
:Adjust the overall size of the noise. Values further from 0 give less frequent noise.
;{{Literal|Strength}}
:Adjusts the Y scaling of the noise function.
;{{Literal|Offset}}
:Time offset for the noise effect.
;{{Literal|Phase}}
:Adjusts the random seed of the noise.
;{{Literal|Depth}}
:Adjusts how detailed the noise function is.
{{clr}}

===Python===
This can use Python script to generate values over time that are relayed to the parameter they are assigned to. It is mostly using with working F-curves in Drivers mode.
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===Limits===
[[File:Doc-26-Manual-Animation-Graph_Editor_Modifiers_Limits.png|thumb|right|500px|The Limits modifier.]]
Limit curve values to specified X and Y ranges.

;{{Literal|Minimum/Maximum X}}
:Cuts a curve off at these frames ranges, and sets their minimum value at those points.
;{{Literal|Minimum/Maximum Y}}
:Truncates the curve values to a range.
{{clr}}

===Stepped Interpolation===
[[File:Doc-26-Manual-Animation-Graph_Editor_Modifiers_Stepped.png|thumb|right|500px|The Stepped Interpolation modifier.]]
Gives the curve a stepped appearance by rounding values down within a certain range of frames.

;{{Literal|Step Size}}
:Specify the number of frames to hold each frame
;{{Literal|Offset}}
:Reference number of frames before frames get held. Use to get hold for ‘1-3’ vs ‘5-7’ holding patterns.
;{{Literal|Use Start Frame}}
:Restrict modifier to only act before its ‘end’ frame
;{{Literal|Use End Frame}}
:Restrict modifier to only act after its ‘start’ frame
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{{Page/Footer|Doc:2.5/Manual/Animation/Editing Curves|Doc:2.5/Manual/Animation/Drivers}}

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wiki>Urkokul: /* Noise */

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