Relations reference

This section lists the Relations operators supported by MotionBuilder. The list of operators used in a Relations constraint is further divided by numeric type or usage. Operators are shown only in the Relations pane.

Boolean

Use Boolean operators to evaluate Boolean expressions. The following Boolean expressions are supported by MotionBuilder:

AND
Purpose	Evaluates the Boolean expression (a and b).
Receives	Two Boolean values.
Sends	(1) when both (a) and (b) equal (1). Otherwise, (0) is sent.(a)(b)(Result) 000 010 100 111.

Flip flop
Purpose	This is a special box that acts like a switch.
Receives	Two Boolean values, (b) and (Clear).
Sends	When (b) is equal to (1) the (result) is reversed (0). For example, the first time (b) equals (1) the (result) is (1). The second time the (result) is (0). The third time the (result) is (1), and so on.When (Clear) equals (1), (result) is reset to (0).

Memory (B1 when REC)
Purpose	Boolean trigger operator which keeps triggering while a second trigger is received.
Receives	Two Boolean values, (b1) and (REC).
Sends	The value (b1) is sent to (result) when (REC) equals (1).

Memory (last trigger)
Purpose	Boolean trigger operator which keeps the last trigger until a new trigger is received.
Receives	Ten Boolean values: (b1-b10) and (Clear).
Sends	Ten Boolean output values (Out1-Out10) and a result number.When any (bn) is set to (1), its relative (Outn) is set to (1) and kept until another (bn) receives a (1).If any (Outn) equals (1), (result) equals (1).When (Clear) equals (1), all (Outn) are reset to (0).If you need to use more than ten entry connectors, you can connect two of these operators together by sending the (result) of the first operator into the (Clear) of the second operator. You also have to connect the (Clear) of the second into the (result) of the first.

NAND
Purpose	Evaluates the Boolean expression not ((a) and (b)).
Receives	Two Boolean values.
Sends	(0) when (a) and (b) equals (1). Otherwise, (1) is sent.(a) (b) (Result) 0 0 1 0 1 1 1 0 1 1 1 0

NOR
Purpose	Evaluates the Boolean expression not ((a) or (b)).
Receives	Two Boolean values.
Sends	(0) when (a) or (b) equals (1).(a) (b) (Result) 0 0 1 0 1 0 1 0 0 1 1 0

NOT
Purpose	Evaluates the Boolean expression not (a).
Receives	A Boolean value.
Sends	The opposite of (a). (a) (Result) 0 1 1 0.

OR
Purpose	Evaluates the Boolean expression (a or b).
Receives	Two Boolean values.
Sends	(1) when (a) or (b) equals (1). (a) (b) (Result) 0 0 0 0 1 1 1 0 1 1 1 1.

XNOR
Purpose	Evaluates the Boolean expression (a is equivalent to b).
Receives	Two Boolean values.
Sends	(0) when (a) and (b) are different.(a) (b) (Result) 0 0 1 0 1 0 1 0 0 1 1 1.

XOR
Purpose	Evaluates the Boolean expression not (a is equivalent to b).
Receives	Two Boolean values.
Sends	(1) when (a) and (b) are different.(a) (b) (Result) 0 0 0 0 1 1 1 0 1 1 1 0.

Converters

Use converters to convert between numerical and vector types. MotionBuilder supports the following converters:

Deg to rad
Purpose	Converts an angle from a degree to a radian.
Receives	A numerical value.
Sends	A numerical value.

HSB to RGB
Purpose	Converts HSB to RGB mode.
Receives	Three numerical values (h), (s), and (b), where h = hue, s = saturation, and b = brightness.
Sends	Three numerical values: (x), (y), and (z).

Number to RGBA
Purpose	Converts four numbers into a color vector.
Receives	Four numerical values: (r), (g), (b), and (a).
Sends	A color vector as (result) = {r,g,b,a}. Where (r) = red, (g) = green, (b) = blue, and (a) = alpha.

Number to Vector
Purpose	Converts three numbers into a vector.
Receives	Three numerical values: (x), (y), and (z).
Sends	A vector as (result) = {x,y, z}.

Number to Vector2
Purpose	Converts two numbers into a vector.
Receives	Two numerical values: (x) and (y).
Sends	A vector as (result) = {x,y}.

Rad to Deg
Purpose	Converts representation from a radian to a degree.
Receives	A numerical value.
Sends	A numerical value.

RGB to HSB
Purpose	Converts RGB to HSB mode.
Receives	Three numerical values: (x), (y), and (z).
Sends	Three numerical values (h), (s), and (b), where h = hue, s = saturation, and b = brightness.

RGB to RGBA
Purpose	Converts RGB to RGBA with Alpha channel mode.
Receives	Three numerical values: (r), (g) and (b).
Sends	Four numerical values: (r), (g), (b), and (a).

RGBA to Number
Purpose	Converts a color vector into four numbers.
Receives	A color vector: {r, g, b, a}.
Sends	Four numerical values (r), (g), (b), and (a) where (r) = red, (g) = green, (b) = blue, and (a) = alpha.

RGBA to RGB
Purpose	Converts RGB with Alpha channel to RGB mode.
Receives	Four numerical values: (r), (g), (b), and (a).
Sends	Three numerical values: (r), (g) and (b).

Seconds to Time
Purpose	Converts a number of seconds to a time format.
Receives	Number of seconds.
Sends	Time in time format.

Time to Seconds
Purpose	Converts time to a timecode.
Receives	Time in time format.
Sends	Timecode.

Time to TimeCode
Purpose	Converts time to a timecode.
Receives	Time in time format.
Sends	Timecode.

TimeCode to Time
Purpose	Converts time to a number of seconds.
Receives	Time in time format.
Sends	Number of seconds.

Vector to Number
Purpose	Converts a vector into three numbers.
Receives	A vector: {x, y, z}.
Sends	Three numerical values: (x), (y), and (z).

Vector2 to Number
Purpose	Converts a vector into two numbers.
Receives	A vector: {x, y}.
Sends	Two numerical values: (x) and (y).

Macro Tools

Use the Macro Tools to create customized relation boxes. Any input and output boxes you drop into your Macro become connectors on your customized Relations box.

Change the name of your connectors by right-clicking the input or output boxes, and selecting Rename from the context menu

Macro Input Bool
Sends	Input (Boolean).

Macro Input ColorAndAlpha
Sends	Input (ColorAndAlpha).

Macro Input Number
Sends	Input (number).

Macro Input Time
Sends	Input (time).

Macro Input Vector
Sends	Input (vector).

Macro Output Bool
Receives	Output (Boolean).

Macro Output ColorAndAlpha
Receives	Output (ColorAndAlpha).

Macro Output Number
Receives	Output (time).

Macro Output Time
Receives	Output (number).

Macro Output Vector
Sends	Output (vector).

My Macros

Any new Relations constraint you create appears in the My Macros operators. You can rename the constraint in the Scene browser and use the My Macros operator to store your custom Relations constraints.

Drag custom Macro constraints from Operators into the Viewer window. For more on macros, see Creating, editing, renaming, and deleting Macro relations.

Number

The Number operators evaluate mathematical expressions involving numbers. If you want to evaluate vector mathematics, use the appropriate rotation or vector operator.

Absolute (\|a\|)
Purpose	Sends the absolute value of a received number.
Receives	A numerical value: (a).
Sends	The positive value of the received number.For example, if (a) = -3, the (result) is 3.

Add (a + b)
Purpose	Adds two numbers.
Receives	Two numbers: (a) and (b).
Sends	The sum of the two numbers. (result) = (a) + (b).

arccos (a)
Purpose	Performs the arccosine function on a numerical value.
Receives	A numerical value: (a).
Sends	The arccosine of a. (result) = arccos(a).

arcsin (a)
Purpose	Performs the arcsine function on a numerical value.
Receives	A numerical value (a).
Sends	The arcsine of a. (result) = arcsin(a).

arctan (a)
Purpose	Performs the inverse of a tangent function.
Receives	A numerical value: (a).
Sends	The inverse tangent of (a).

arctan2 (b/a)
Purpose	Performs the arctangent function using two numerical values.
Receives	Two numerical values: (a) and (b).
Sends	The arctangent of (b) divided by (a). (result) = arctan(b/a).

Cosine cos (a)
Purpose	Performs the cosine function on a numerical value.
Receives	A numerical value: (a).
Sends	The cosine of a. (result) = cos(a).

Damp
Purpose	Applies damping to a numerical value.
Receives	Two numerical values. The first value (a) is the value to be damped. The second value (Damping Factor) is the damping factor.
Sends	(result) = (a) with damping.

Damp (clock-based)
Purpose	Similar to Damp, except this relation is based on the MotionBuilder clock instead of the refresh rate. This relation is recommended over the Damp relation, as it makes your scene identical on every computer.
Receives	A (number), Damping Factor (number) and Play Mode (number).
Sends	Result (number).

Distance Numbers
Purpose	Calculates the distance between two positions.
Receives	Two numbers: (a) and (b).
Sends	The distance between (a) and (b).

Divide (a/b)
Purpose	Divides two numbers.
Receives	Two numerical values: (a) and (b).
Sends	The quotient of the first number (a) divided by the second number (b). (result) = (a/b).

Exp (a)
Purpose	Multiplies the base value [e] by itself (a) times. [e=2.718].
Receives	A numerical value: (a).
Sends	(result) = (e^a). For example (e^2) is 2.718 x 2.718 = 7.3875.

Exponent (a^b)
Purpose	Multiplies the numerical value (a) by itself (b) times.
Receives	Two numerical values: (a) and (b).
Sends	(result) = (a^b), or (a) to the power of (b).

If Cond Then A Else B
Purpose	Evaluates an If, Then, Else statement.
Receives	Two numerical values: (a) and (b), and a condition: (bool).
Sends	If Cond is non-zero, the (a) input is output as the Result. If the Cond is zero, the (b) input is output as the Result.

Integer
Purpose	Rounds numerical values down to the next full digit.
Receives	A numerical value: (a).
Sends	The numerical value rounded down to the next full digit.

Invert (1/a)
Purpose	Inverts a numerical value.
Receives	a numerical value (a).
Sends	1 divided by a numerical value. (result) = (1/a).

Is between A and B
Purpose	Checks if one value is between two others.
Receives	Two numerical values: (a) and (b).
Sends	(result) = true (1) if the first value (a) is between the second value (b). Otherwise, (result) is false (0).

Is different (a != b)
Purpose	Checks if two values are not equal.
Receives	Two numerical values: (a) and (b).
Sends	(result) = true (1) if the first value (a) is not equal to the second value (b). Otherwise, (result) is false (0).

Is greater (a > b)
Purpose	Checks if one value is greater than another.
Receives	Two numerical values: (a) and (b).
Sends	(result) = true (1) if the first value (a) is greater than the second value (b). Otherwise, (result) is false (0).

Is greater or equal (a >=b)
Purpose	Checks if one value is greater than or equal to another.
Receives	Two numerical values: (a) and (b).
Sends	(result) = true (1) if the first value (a) is greater than or equal to the second value (b). Otherwise, (result) is false (0).

Is identical (a == b)
Purpose	Checks if two values are equal.
Receives	Two numerical values: (a) and (b).
Sends	(result) = true (1) if the first value (a) is equal to the second value (b). Otherwise, (result) is false (0).

Is less (a < b)
Purpose	Checks if one value is less than another.
Receives	Two numerical values: (a) and (b).
Sends	(result) = true (1) if the first value (a) is less than the second value (b). Otherwise, (result) is false (0).

Is less or equal (a <= b)
Purpose	Checks if one value is less than or equal to another.
Receives	two numerical values: (a) and (b).
Sends	(result) = true (1) if the first value (a) is less than or equal to the second value (b). Otherwise, (result) is false (0).

ln(a)
Purpose	Calculates the natural logarithm.
Receives	A numerical value: (a).
Sends	The natural logarithm of (a). (result) = ln(a).

Log(a)
Purpose	Calculates the base-10 logarithm of a number.
Receives	A numerical value: (a).
Sends	The base-10 logarithm of (a). (result) = log(a).

Max Pass-thru
Purpose	Given a set of numbers, returns the maximum number.
Receives	Multiple numerical values.
Sends	The maximum value of the inputs.

Memory (a when REC)
Purpose	The value (a) is sent to (result) when (REC) equals (1). Use this operator to send a value when a trigger is received (REC).
Receives	A numerical value: (a) and a Boolean value: (REC which is either 0 or 1).
Sends	(a) when (REC) is true (1).

Min Pass-thru
Purpose	Given a set of numbers, returns the minimum number.
Receives	Multiple numerical values.
Sends	The minimum value of the inputs.

Modulo mod (a,b)
Purpose	Divides two values and sends the remainder.
Receives	Two numerical values: (a) and (b).
Sends	The quotient of dividing the first value (a) by the second value (b).

Multiply (a x b)
Purpose	Multiplies two values.
Receives	Two numerical values: (a) and (b).
Sends	The product of multiplying the first value (a) by the second value (b). (result) = (a)(b).

Precision numbers
Purpose	Cuts the number at a specified precision value, for example, if a = 12.36 and the assigned precision value is 0.1, then the output is 12.30.
Receives	(a)(number) and Precision (number).
Sends	Result (number).

Pull number
Purpose	Continuously pulls the value from the input parameter and stores the result in the internal buffer, which is then used as the Result value. Gives you the value of the last evaluation, which is useful if you need to constrain an object with its own data.
Receives	(a)(number)
Sends	Result (number)

Scale and offset (Number)
Purpose	Scales and offsets a numerical value.
Receives	Five numerical values: a maximum clamping number (Clamp Max), a minimum clamping number (Clamp Min), an offset (Offset), a scaling factor (Scale Factor), and the original value (x).
Sends	The original value (x) multiplied by the scaling factor (Scale Factor) and offset by an offset value (Offset). If the result is greater than the maximum clamping value (Clamp Max), the maximum clamping value is sent.If the result is lower than the minimum clamping value (Clamp Min), the minimum clamping value is sent. (result) = [(x) multiplied by (Scale) + (Offset)]. (result) is no less than (Clamp Min) and no greater than (Clamp Max).

Sine sin(a)
Purpose	Performs the sine function on a numerical value.
Receives	A numerical value: (a).
Sends	The sine of (a). (result) = sin(a).

sqrt(a)
Purpose	Finds the square root of a numerical value.
Receives	A numerical value: (a).
Sends	The square root of the received value. (result) = sqrt(a).

Subtract (a-b)
Purpose	Subtracts two numerical values, (a) and (b).
Receives	Two numerical values: (a) and (b).
Sends	The result of the first number subtracted by the second number. (result) = (a) - (b).

Sum 10 numbers
Purpose	Adds 10 to a numerical value.
Receives	Ten numerical values: (a),(b),(c),(d),(e),(f),(g),(h),(i),(j).
Sends	Numerical value + 10. (result) = (a)+10.

Tangent tan(a)
Purpose	Performs the tangent function on a numerical value.
Receives	A numerical value: (a).
Sends	The tangent of (a). (result) = tangent(a).

Triggered delay (Number)
Purpose	Delays sending a numerical value.
Receives	A delay in time format, the number to be sent following the delay, a panic button, and an “Enabled” button that starts the counter.
Sends	The received number after a time delay, which starts counting when the box is enabled. Trigger the panic button to send the number before the time delay is reached.

Triggered Delay with Memory (Number)
Purpose	Delays sending a numerical value.
Receives	A delay in time format, the number to be sent following the delay, and a toggle switch.
Sends	The received number after a time delay.

Other

These are miscellaneous operators.

Bezier curve
Purpose	Creates spline behavior, like “Paths” in other 3D applications.One box creates one segment if a spline.Join multiple boxes to create a spline with many segments. Four objects are required to serve as control points.
Receives	Four translations (Control points 1-4 and previous segment’s result), Position ratio (0-100%. Represents the position on the curve sent to the result. If you use multiple segments connected to the same source value for every bezier curve boxes), Segment count (the number of segments, or Bezier curve boxes, used), and Segment index (the order of this box when used in a series of segments, starting at 1.
Sends	Result (Number)

Clip trigger
Receives	Three translations (Front, Source, and Target) and a Stop Range.
Sends	Accel, Decel, Forward, Left 45, Left 90, Right 45, Right 90, Turn 180.

Damping (3D)
Purpose	Damps the position of a vector using a specified damping factor.
Receives	A numerical damping factor (Damping Factor) and the vector to be dampened (P).
Sends	A vector after applying damping.

Damp (3D) (Clock-based)
Purpose	Similar to Damp (clock-based), except this relation is based on the Damp (3D) relation.
Receives	P (Point), Damping Factor (Number) and Play Mode (Number).
Sends	Result (Number).

FCurve number (%)
Purpose	Right-click and select Edit from the context menu to edit the FCurve manually. Shown as a percentage relative to the length of the curve.
Receives	Percentage 0-100% (number).
Sends	Value (number).

FCurve number (Time)
Purpose	Right-click and select Edit from the context menu to edit the FCurve manually. Sends a value relative to the current time.
Receives	Position % (number).
Sends	Value (number).

Real Time Filter
Purpose	Applies a low‐pass filter to incoming live data.
Receives	Drop Analysis, Drop Error, Enable, Filter Len, Filter Type (numbers) and In P 0 - In P 31 (vectors).
Sends	Out P 0 - Out P 31 (vectors).

Triggered plus minus counter
Purpose	Creates a trigger to add the increment/decrement. (You must specify the value of the increment/decrement.) Also contains a Loop option.
Receives	Increment, Max, Min (numbers) and Loop, Trigger Increase, Trigger Decrease (Boolean).
Sends	Number. (result) = (a)+ or (a)-.

Triggered random
Purpose	Generates a random number on demand.
Receives	Max, Min, Precision, Seed (number) and Trigger Get Number (Boolean.)
Sends	Number.

Rotation

The Rotation operators are used specifically for rotation values. All rotation values are vectors.

Add (R1 + R2)
Purpose	Adds two rotation vectors together.
Receives	Two rotation vectors: (Ra) and (Rb).
Sends	A vector sum. (result) = (Ra) + (Rb).

Angle difference (Points)
Purpose	Calculates the angle between two vectors, or points, using a supplied radius.
Receives	Two vectors for the position of each point: (P1) and (P2), and the radius (Radius).
Sends	The angle as a numerical value.

Angle difference (Rotations)
Purpose	Calculates the difference between the rotation of two objects. The result can be scaled and offset.
Receives	The scaling factor (Mult. Factor) and numerical offset (Offset) followed by the two rotations to be compared (R1 and R2).
Sends	The angle difference between the two rotations, scaled and offset.

Angular acceleration
Purpose	Returns the angular acceleration of a rotation vector.
Receives	Rotation value (R).
Sends	Result (vector).

Angular speed
Purpose	Returns the angular speed of a rotation vector.
Receives	Rotation value (R).
Sends	Result (vector).

Damp (Rotation)
Purpose	Applies damping to a rotation vector.
Receives	Damping (number), Maximum acceleration (Max acc), Maximum speed (Max speed), and rotation vector (R).
Sends	Dampened rotation vector.

Global to local
Purpose	Converts a rotation vector from global to local coordinates.
Receives	A base rotation vector (Base) and a Global rotation vector (Global Rot).
Sends	The converted local rotation.

Interpolate
Purpose	Interpolates between two rotations.
Receives	A numerical ratio (c) and two rotation vectors: (Ra) and (Rb).
Sends	The difference between rotation vectors (Ra) and (Rb). The difference is sent as a vector. (result) = (Ra) + c[(Rb) - (Ra)].

Local to global
Purpose	Converts a rotation vector from local to global coordinates.
Receives	A base rotation vector (Base), and Local rotation vector (Local Rot).
Sends	The converted global rotation.

Rotation scaling
Purpose	Scales a rotation vector based on a numerical ratio.
Receives	A numerical ratio (b) and the rotation vector to be scaled (Ra).
Sends	A scaled rotation vector. (result) = (b)(Ra).

Sensor rotation helper
Receives	A rotation vector from the model (Model), a rotation offset (Offset), the rotation vector from the sensor (Sensor), and a numerical scaling factor for each coordinate (X factor, Y factor, and Z factor).
Sends	A rotation vector.

Subtract(R1 - R2)
Purpose	Subtracts two rotation vectors.
Receives	Two rotation vectors: (Ra) and (Rb).
Sends	The result of the first rotation vector subtracted by the second rotation vector. (result) = (Ra) - (Rb).

Three-point constraint
Purpose	Creates a rotation from three vectors.
Receives	Three position vectors: (Pa, Pb, and Pc).
Sends	A rotation vector based on the three received vectors.

Shapes

Shape operators are special operators for use with models that have shape animations (also known as morph targets).

Select exclusive
Purpose	Calculates the shape’s values relative to the ratio (percent / [SUM shape n]) only when [SUM shape n] is greater than (Percent).
Receives	A percentage (Percent) and six shapes as well as a Default Shape.
Sends	Result (shapes) = (percent / [SUM shape n]) x (shape n). Result (Default Shape) = (percent - [SUM shape n]).For example, (percent = 80), (Shape 1= 60), (Shape 2= 50) and (Shape 3= 90). Result is (Shape 1= 24), (Shape 2= 20) and (Shape 3= 36).

Select exclusive 24
Purpose	Same as Select exclusive, except it offers twenty-four shapes.
Receives	A percentage (Percent) and up to twenty-four shapes as well as a Default Shape.
Sends	Result (shapes) = (percent / [SUM shape n]) x (shape n). Result (Default Shape) = (percent - [SUM shape n]).For example, (percent = 80), (Shape 1= 60), (Shape 2= 50) and (Shape 3= 90). Result is (Shape 1= 24), (Shape 2= 20) and (Shape 3= 36).

Shape calibration
Purpose	Calculates the percentage of a value interpolated between a minimum and a maximum value.
Receives	A maximum numerical value (Max), a minimum numerical value (Min), a Boolean reverse value (0 or 1), and the value to be calibrated (Value).
Sends	A percentage. If (reverse) is 1, the result is reversed. (result) = 100 - (result).

Sources

You can use source operators to create automatic movement, rotation, and shape animation by providing an oscillating data source. For example, the Sine Ramp creates a sine wave that can be used to make a model’s eyes blink.

Counter with play pause
Purpose	Similar to Counter with Start Stop, this source operator also lets you create a counter.
Receives	Bounce (bool), Loop (number), Max (number), Min (number), Play Mode, Speed, Trigger (Bool), and Trigger Reset.
Sends	Count (number). The counter begins counting when the Trigger connector receives a non-zero value. The counter increases from the Start value to the Stop value.If the Bounce connector is set to true (1), the counter decreases back to the Start value. Use the Freq value to set the number of times the count is performed.

Counter with start stop
Purpose	This source operator lets you create a counter.
Receives	Bounce (bool), Freq (number), Start (number), Stop (number), and Trigger (Bool).
Sends	Count (number).The counter begins counting when the Trigger connector receives a non-zero value.The counter increases from the Start value to the Stop value. If the Bounce connector is set to true (1), the counter decreases back to the Start value. Use the Freq value to set the number of times the count is performed.

Half circle ramp
Purpose	Applies the input values to a half circle ramp.
Receives	Three numerical values: the amplitude (Amp), frequency (Freq), and phase percentage (Phase %).
Sends	A half circle ramp based on the received amplitude, frequency, and phase percentage.

Isosceles triangle ramp
Purpose	Applies the input values to an isosceles triangle ramp.
Receives	Three numerical values: the amplitude (Amp), frequency (Freq), and phase percentage (Phase %).
Sends	An isosceles triangle ramp based on the received amplitude, frequency, and phase percentage.

Pulse
Purpose	Sends an alternating stream of zeroes and ones at the specified frequency. For example: 010101010101. Use the Enabled connector to activate and disable the Pulse constraint.
Receives	Enabled (Bool), Freq Hz (number), Play Mode.
Sends	Result (number).

Ramp
Purpose	Applies the input values to a ramp.
Sends	A numerical count. Starts at zero when the Ramp operator is first added to the Relations window and continues counting upwards.

Random
Purpose	Creates a stream of random numbers at a specified frequency.
Receives	Freq, Max, Min, Play Mode, Precision, Seed (number).
Sends	Result (number).

Right triangle ramp
Purpose	Applies the input values to a right triangle ramp.
Receives	Three numerical values: the amplitude (Amp), frequency (Freq), and phase percentage (Phase %).
Sends	A right triangle ramp based on the received amplitude, frequency, and phase percentage.

Sine ramp
Purpose	Applies the input values to a sine ramp.
Receives	Three numerical values: the amplitude (Amp), frequency (Freq), and phase percentage (Phase %).
Sends	A sine wave ramp based on the received amplitude, frequency, and phase percentage.

Square ramp
Purpose	Applies the input values to a square ramp.
Receives	Three numerical values: the amplitude (Amp), frequency (Freq), and phase percentage (Phase %).
Sends	A square wave ramp based on the received amplitude, frequency, and phase percentage.

System

System operators let you use a time code and the play or record state in your Relations constraints.

Current time
Purpose	Uses the current time code.
Sends	The current time code.

Local time
Purpose	Uses the local time code.
Sends	The local time code shown in the Local Time code field.

Play Mode
Purpose	Verifies that MotionBuilder is in playback mode.
Sends	A Boolean value: true (1) if MotionBuilder is in playback mode. Otherwise, sends false (0).

Reference Time
Purpose	Uses the reference time code.
Sends	The reference time code shown in the Reference Time code field.

System Time
Purpose	Uses the computer’s system clock.
Sends	The system time in SMPTE time code.

Transport Control
Purpose	Acts like buttons on the Transport Controls.
Receives	Play (Bool), Play Backward (Bool), Record (Bool), Step Forward (Bool), Step Backward (Bool), Goto Beginning (Bool), Goto End (Bool), Goto Position Trigger (Bool), and Goto Position Value (Time).
Sends	Play (Bool), Play Backward (Bool), and Record (Bool).

Time

Use the Time operators to compare two different times expressed in either SMPTE time code or frames per second. These operators can be used, for example, to trigger rotations, translation, or animation based on the current time code.

If Cond Then T1 Else T2
Purpose	Evaluates an If, Then, Else statement based on Time (T1).
Receives	Three values: Cond (bool) and T1 and T2 (Time).
Sends	If Cond is non-zero, the (T1) input is output as the Result. If the Cond is zero, the (T2) input is output as the Result.

Is Different (T1!= T2)
Purpose	Checks if Time (T1) is different than (T2).
Receives	Two time values: (T1) and (T2), measured in frames per second or SMPTE.
Sends	A Boolean value: true (1) if (T1) does not equal (T2) and sends false (0) if (T1) equals (T2).

Is Greater (T1 > T2)
Purpose	Checks if Time (T1) is greater than (T2).
Receives	Two time values: (T1) and (T2), measured in frames per second or SMPTE.
Sends	A Boolean value: True (1) if (T1) is greater than (T2) or sends false (0) if (T1) is less than or equal to (T2).

Is Greater or Equal (T1 >= T2)
Purpose	Checks if Time (T1) is greater than or equal to (T2).
Receives	Two time values: (T1) and (T2), measured in frames per second or SMPTE.
Sends	A Boolean value: True (1) if (T1) is greater than and equal to (T2) or sends false (0) if (T1) is less than (T2).

Is Identical (T1 == T2)
Purpose	Checks if Time (T1) is equal to (T2).
Receives	Two time values: (T1) and (T2), measured in frames per second or SMPTE.
Sends	A Boolean value: True (1) if (T1) is equal to (T2) or sends false (0) if (T1) does not equal (T2).

Is Less (T1 < T2)
Purpose	Checks if Time (T1) is less than (T2).
Receives	Two time values: (T1) and (T2), measured in frames per second or SMPTE.
Sends	A Boolean value: True (1) if (T1) is less than (T2) or sends false (0) if (T1) is greater than or equal to (T2).

Is Less or Equal (T1 <= T2)
Purpose	Checks if Time (T1) is less than or equal to (T2).
Receives	Two time values: (T1) and (T2), measured in frames per second or SMPTE.
Sends	A Boolean value: true (1) if (T1) is less than or equal to (T2). Sends false (0) if (T1) is greater than (T2).

Vector

The Vector operators evaluate vector mathematics and other calculations involving vectors. All translation, rotation, and scaling values for models and assets are expressed as vectors.

Acceleration
Purpose	Calculates the acceleration of a vector (Position) based on how fast the vector’s values change over time. You can use this operator to calculate, for example, how fast an object is translated or rotated.
Receives	A vector (Position).
Sends	A vector indicating the acceleration of the supplied vector (Position).

Add (V1 + V2)
Purpose	Adds two vectors.
Receives	Two vectors: (V1) and (V2).
Sends	Sum of two vectors. (result) = (V1) + (V2).

Angle
Purpose	Creates the angle between two vectors (expressed in degrees).
Receives	Two vectors (V1) (V2).
Sends	Number. (result) = (V1) - (V2).

Center of Mass
Purpose	Computes the center of a set of vectors (expressed as 3D space coordinates).
Receives	Two vectors (V1) (V2).
Sends	Computed center point (average) as a vector.

Damp position
Purpose	Applies damping to a position vector.
Receives	A numerical damping factor (Damping), a numerical maximum acceleration (Max acc), a numerical maximum speed (Max speed), and a position vector (T).
Sends	Dampened vector.

Derive
Purpose	Derive with reset. The Reset connector only accepts Boolean values (either 0 or 1). Send 1 to the Reset connector to reset the Derive operator to its original vector (Initial Vector).
Receives	Reset (Bool), V1 (Initial vector), and V2 (vector).
Sends	A vector derived from the two vectors. If the Reset (bool) connector is sent a 1, Derive is reset to its original vector (Initial Vector).

Determinant
Purpose	Gives the determinant of a 3x3 column (I, J, K) matrix.
Receives	Three vectors: I, J, and K.
Sends	A number.

Displacement
Purpose	Eliminates the dependency on display frame rates.
Receives	Velocity (Vector) and Reset (Action to reset original position to zero).
Sends	A vector (0 position computed from live input velocity).

Distance
Purpose	Calculates the distance between two positions.
Receives	Two vectors: (V1) and (V2).
Sends	The distance between the two vectors, expressed as a numerical value.

Dot product (V1 . V2)
Purpose	Calculates the dot product of two vectors.
Receives	Two vectors: (V1) and (V2).
Sends	Dot product of two vectors, expressed as a numerical value. (result) = (V1). (V2).

Gravity
Purpose	Returns a position.
Receives	Three vectors: (Acceleration, Position and Speed).
Sends	A number. (result)= (a)(b)(c).

If cond then A else B
Purpose	Evaluates an If, Then, Else statement.
Receives	Two vectors: (a) and (b), and a condition (bool).
Sends	If Cond is non-zero, the first vector (a) is output as the Result. If the Cond is zero, the second vector (b) is output as the Result.

Is different (V1 != V2)
Purpose	Checks if vector (V1) is different than vector (V2).
Receives	Two time values: (V1) and (V2), measured in frames per second or SMPTE.
Sends	A Boolean value: True (1) if (V1) does not equal (V2) and sends false (0) if (V1) equals (V2).

Is identical (V1 == V2)
Purpose	Checks if vector (V1) is equal to vector (V2).
Receives	Two time values: (V1) and (V2), measured in frames per second or SMPTE.
Sends	A Boolean value: True (1) if (V1) is equal to (V2) and sends false (0) if (V1) does not equal (V2).

Length
Purpose	Calculates the distance between a vector and the world zero point.
Receives	A vector: (V1).
Sends	The distance between the vector and the world zero point, expressed as a numerical value.

Memory (V1 when REC)
Purpose	Use this operator to send a vector when a trigger is received (REC).
Receives	]A vector (V1) and a Boolean value (REC, which is either 0 or 1).
Sends	(result) = (V1) when (REC) is true (1).

Middle point
Purpose	Interpolates between two vectors relative to a given ratio.
Receives	Two vectors: (V1) and (V2), and a ratio (Ratio) between 0 and 1.
Sends	An interpolated vector. (result) = V1 + ratio[(V2) - (V1)].

Normalize
Purpose	Normalizes a vector.
Receives	A vector.
Sends	A normalized vector where each coordinate is normalized between 0 and 1.

Orbit attraction
Purpose	Returns a position.
Receives	A number (Acceleration) and three vectors: (Origin, Position, and Speed.)
Sends	A vector. (result)= (a)(b)(c)(d).

Precision vectors
Purpose	Use this constraint to apply a precise value to every component of the vector: X, Y, and Z can each have different precision values.
Receives	A (number) and Precision (number).
Sends	Result (number).

Pull vector
Purpose	Continuously pulls the value from the input parameter and stores it in the internal buffer, which is then used as the Result value. This gives you the value of the last evaluation. This is useful when you need to constrain an object with its own data.
Receives	V (Vector).
Sends	Result (Vector).

Scale (a x V)
Purpose	Scales a vector by a numerical value.
Receives	A scaling factor (number) and a vector (Vector).
Sends	The scaled vector. (result) = (number) x (Vector).

Scale and offset (Vector)
Purpose	Scales and offsets a vector.
Receives	A maximum clamping vector (Clamp Max), a minimum clamping vector (Clamp Min), an offset vector (Offset), a scaling factor expressed as a numerical value (Scale), and the original vector (x).
Sends	The original vector (x) multiplied by the scaling factor (Scale) and offset by the offset vector (Offset).If the result is greater than the maximum clamping vector (Clamp Max), the maximum clamping vector is sent. If the result is lower than the minimum clamping vector (Clamp Min), the minimum clamping vector is sent. (result) = (x) multiplied by [(Scale Factor) + (Offset)]. (result) is no less than (Clamp Min) and no greater than (Clamp Max).

Scale damping
Purpose	Applies damping to a scaling vector.
Receives	A numerical damping factor (Damping), a numerical maximum acceleration (Max acc), a numerical maximum speed (Max speed), and a scaling vector (S).
Sends	A scaled vector with damping.

Speed
Purpose	Calculates the speed of a vector based on its change of position over time.
Receives	A vector (Position).
Sends	The speed of the vector expressed as a vector (Translation).

Subtract (V1 - V2)
Purpose	Subtracts two vectors.
Receives	Two vectors: (V1) and (V2).
Sends	The result of the first vector subtracted by the second vector. (Result) = (V1) - (V2).

Sum 10 vectors
Purpose	Adds 10 to a numerical value.
Receives	Ten vectors: (a),(b),(c),(d),(e),(f),(g),(h),(i),(j).
Sends	Vector + 10. (result) = (a)+10.

Triggered delay (Vector)
Purpose	Delays sending a vector value.
Receives	A delay in time format, the vector to be sent following the delay, a panic button, and an “Enabled” button that starts the counter.
Sends	The received vector after a time delay, which starts counting when the box is enabled.Trigger the panic button to send the vector before the time delay is reached.

Triggered delay with memory (Vector)
Purpose	Delays sending a vector value.
Receives	A delay in time format, the vector to be sent following the delay, and a toggle switch.
Sends	The received vector after a time delay.

Vector product (V1 x V2)
Purpose	Multiplies two vectors.
Receives	Two vectors: (V1) and (V2).
Sends	The product of two vectors. (result) = (V1) x (V2).