.. TODO/Review: {{review|im=examples}}. ***************** F-Curve Modifiers ***************** .. admonition:: Reference :class: refbox | Panel: :menuselection:`Properties region --> Modifiers --> 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 ================= .. figure:: /images/editors_graph-editor_fcurves_fmodifiers_panel.png Modifiers Panel. The F-Curve modifier panel is located in the Properties region. Select a curve by selecting one of its curve points, or by selecting the channel list. Click on the *Add Modifier* menu to select a modifier. Types of Modifiers ================== Generator --------- 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. Additive This option causes the modifier to be added to the curve, instead of replacing it by default. Polynomial 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. .. seealso:: `The Wikipedia Page `__ for more information on polynomials. Built-in Function ----------------- 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``) Amplitude Adjusts the Y scaling. Phase Multiplier Adjusts the X scaling. Phase Offset Adjusts the X offset. Value Offset Adjusts the Y offset. Envelope -------- Allows you to adjust the overall shape of a curve with control points. Reference Value Set the Y value the envelope is centered around. Min Lower distance from Reference Value for ``1:1`` default influence. Max Upper distance from Reference Value for ``1:1`` default influence. Add Point Add a set of control points. They will be created at the current frame. Point Frame Set the frame number for the control point. Min Specifies the lower control point's position. Max Specifies the upper control point's position. Cycles ------ Cycles allows you add cyclic motion to a curve that has two or more control points. The options can be set for before and after the curve. Cycle Mode Repeat Motion Repeats the curve data, while maintaining their values each cycle. Repeat with Offset Repeats the curve data, but offsets the value of the first point to the value of the last point each cycle. Repeat Mirrored Each cycle the curve data is flipped across the X-axis. Before, After Cycles Set the number of times to cycle the data. A value of 0 cycles the data infinitely. Noise ----- Modifies the curve with a noise formula. This is useful for creating subtle or extreme randomness to animated movements, like camera shake. Blend Type Replace Adds a -0.5 to 0.5 range noise function to the curve. Add Adds a 0 to 1 range noise function to the curve. Subtract Subtracts a 0 to 1 range noise function to the curve. Multiply Multiplies a 0 to 1 range noise function to the curve. Scale Adjust the overall size of the noise. Values further from 0 give less frequent noise. Strength Adjusts the Y scaling of the noise function. Offset Offsets the noise in time. Phase Adjusts the random seed of the noise. Depth Adjusts how detailed the noise function is. Limits ------ Limit curve values to specified X and Y ranges. Minimum, Maximum X Cuts a curve off at these frames ranges, and sets their minimum value at those points. Minimum, Maximum Y Truncates the curve values to a range. Stepped Interpolation --------------------- Gives the curve a stepped appearance by rounding values down within a certain range of frames. Step Size Specify the number of frames to hold each frame. Offset Reference number of frames before frames get held. Use to get hold for (1-3) vs (5-7) holding patterns. Use Start Frame Restrict modifier to only act before its "end" frame. Use End Frame Restrict modifier to only act after its "start" frame.