Sensors

AdonisFX Sensors are nodes in charge of interpreting data extracted from transform nodes and compute information that can be fed into the deformers to alter their behaviour. Sensors work in combination with Locators to display the computed information in an intuitive way using colouring. To be able to display the information computed from the sensors, remappers are used to convert the computed data (e.g. angle) to a valid value in a given range of activation that will drive the colouring of the locators and the activation of an AdnMuscle for example.

AdnSensorPosition

AdnSensorPosition is the sensor for computing meaningful output values representing the velocity or acceleration of a transform node. The values of velocity an acceleration can then be remapped to produce desirable activation values to drive the simulation of an AdonisFX deformer. This sensor has to work in combination with an AdnLocatorPosition both for setup and visualisation. An example use case for this sensor would be applying it to the wrist connection of an arm outputting velocities while swinging.

How To Use

An AdnSensorPosition will be in charge of feeding, after remapping, activation (or other) values into AdonisFX deformers for driving the simulation and the AdnLocatorPosition for visualisation purposes. The value of the sensor can be used, for example, to drive the activation of a muscle simulating contraction to increase its stiffness. Find more information for connecting the sensor to the deformer in sections below.

AdnSensorPosition velocity display on AdnLocatorPosition within a scene
Figure 1: AdnSensorPosition used in a human model.

There are two different methods of creating an AdnSensorPosition, depending if it is to be applied on an existing AdnLocatorPosition or creating it alongside the sensor.

  • If applying to an already existing AdnLocatorPosition:

    1. Select an AdnLocatorPosition from your scene.
    2. Press the AdnSensorPosition button button in the AdonisFX shelf or press Position in the AdonisFX menu, under the Sensor submenu. If the shelf button is double-clicked or the option box in the menu is selected a window will be displayed where a custom name and initial attribute values can be set.
    3. The AdnSensorPosition is created, applied to the selected AdnLocatorPosition.
  • If creating the locator alongside the sensor:

    1. Select a transform node in the scene.
    2. Press the AdnSensorPosition button button in the AdonisFX shelf or press Position in the AdonisFX menu, under the Sensor submenu. If the shelf button is double-clicked or the option box in the menu is selected a window will be displayed where a custom name and initial attribute values can be set.
    3. The AdnSensorPosition is created, alongside a new AdnLocatorPosition applied to the same transform node.

Attributes

Input

Name Type Default Animatable Description
Position Float3 {0.0, 0.0, 0.0} Current transform node position.

Output

Name Type Default Animatable Description
Velocity Float 0.0 Magnitude of the velocity of the transform node.
Acceleration Float 0.0 Magnitude of the acceleration of the transform node.

Time Attributes

Name Type Default Animatable Description
Start Time Time Current frame Determines the frame at which the playback/simulation starts.
Current Time Time Current frame Current playback frame.

Scale Attributes

Name Type Default Animatable Description
Time Scale Float 1.0 Sets the scaling factor applied to the compute the velocity or acceleration. Has a range of [0.001, 10.0]. The upper limit is soft, higher values can be used.
Space Scale Float 1.0 Sets the scaling factor applied to velocity or acceleration. Has a range of [0.001, 100.0]. The upper limit is soft, higher values can be used.

AdnSensorDistance

AdnSensorDistance is the sensor for computing meaningful output values representing the distance, velocity or acceleration between two transform nodes. The values of distance, velocity an acceleration can then be remapped to produce desirable activation values to drive the simulation of an AdonisFX deformer. This sensor has to work in combination with an AdnLocatorDistance both for setup and visualisation. An example use case for this sensor would be applying it to the connection made between bones which would compute the distance between two bones moving together.

How To Use

An AdnSensorDistance will be in charge of feeding, after remapping, activation (or other) values into the deformer for driving the simulation and the AdnLocatorDistance for visualisation purposes. The value of the sensor can be used to drive the activation of a muscle simulating contraction to increase its stiffness. Find more information for connecting the sensor to the deformer in sections below.

AdnSensorDistance distance display on AdnLocatorDistance within a scene
Figure 2: AdnSensorDistance used in a human model.

There are two different methods of creating an AdnSensorDistance, depending if it is to be applied on an existing AdnLocatorDistance or creating it alongside the sensor.

  • If applying to an already existing AdnLocatorDistance:

    1. Select an AdnLocatorDistance from your scene.
    2. Press the AdnSensorDistance button button in the AdonisFX shelf or press Distance in the AdonisFX menu, under the Sensor submenu. If the shelf button is double-clicked or the option box in the menu is selected a window will be displayed where a custom name and initial attribute values can be set.
    3. The AdnSensorDistance is created, applied to the selected AdnLocatorDistance.
  • If creating the locator alongside the sensor:

    1. Select two transform nodes in the scene.
    2. Press the AdnSensorDistance button button in the AdonisFX shelf or press Distance in the AdonisFX menu, under the Sensor submenu. If the shelf button is double-clicked or the option box in the menu is selected a window will be displayed where a custom name and initial attribute values can be set.
    3. The AdnSensorDistance is created, alongside a new AdnLocatorDistance applied to the same transform nodes.

Attributes

Input

Name Type Default Animatable Description
Start Position Float3 {0.0, 0.0, 0.0} Start transform node position.
End Position Float3 {0.0, 0.0, 0.0} End transform node position.

Output

Name Type Default Animatable Description
Distance Float 0.0 Magnitude of the distance between the transform nodes.
Velocity Float 0.0 Magnitude of the velocity between the transform nodes.
Acceleration Float 0.0 Magnitude of the acceleration between the transform nodes.

Time Attributes

Name Type Default Animatable Description
Start Time Time Current frame Determines the frame at which the playback/simulation starts.
Current Time Time Current frame Current playback frame.

Scale Attributes

Name Type Default Animatable Description
Time Scale Float 1.0 Sets the scaling factor applied to the compute the velocity or acceleration. Has a range of [0.001, 10.0]. The upper limit is soft, higher values can be used.
Space Scale Float 1.0 Sets the scaling factor applied to velocity or acceleration. Has a range of [0.001, 100.0]. The upper limit is soft, higher values can be used.

AdnSensorRotation

AdnSensorRotation is the sensor for computing meaningful output values representing the angle, angular velocity or angular acceleration between three transform nodes. The values of velocity and acceleration can then be remapped to produce desirable activation values to drive the simulation of an AdonisFX deformer. This sensor has to work in combination with an AdnLocatorRotation both for setup and visualisation. An example use case for this sensor would be applying it to the arc connection made between bones which would compute the angle between two bones rotating.

How To Use

An AdnSensorRotation will be in charge of feeding, after remapping, activation (or other) values into the deformer for driving the simulation and the AdnLocatorRotation for visualisation purposes. The value of the sensor can be used to drive the activation of a muscle simulating contraction to increase its stiffness. Find more information for connecting the sensor to the deformer in sections below.

AdnSensorRotation angle display on AdnLocatorRotation within a scene
Figure 3: AdnSensorRotation used in a human model.

There are two different methods of creating an AdnSensorRotation, depending if it is to be applied on an existing AdnLocatorRotation or creating it alongside the sensor.

  • If applying to an already existing AdnLocatorRotation:

    1. Select an AdnLocatorRotation from your scene.
    2. Press the AdnSensorRotation button button in the AdonisFX shelf or press Rotation in the AdonisFX menu, under the Sensor submenu. If the shelf button is double-clicked or the option box in the menu is selected a window will be displayed where a custom name and initial attribute values can be set.
    3. The AdnLocatorRotation is created, applied to the selected AdnLocatorRotation.
  • If creating the locator alongside the sensor:

    1. Select three transform nodes in the scene.
    2. Press the AdnSensorRotation button button in the AdonisFX shelf or press Rotation in the AdonisFX menu, under the Sensor submenu. If the shelf button is double-clicked or the option box in the menu is selected a window will be displayed where a custom name and initial attribute values can be set.
    3. The AdnSensorRotation is created, alongside a new AdnLocatorRotation applied to the same transform nodes.

Attributes

Input

Name Type Default Animatable Description
Start Position Float3 {0.0, 0.0, 0.0} Start transform node position.
Mid Position Float3 {0.0, 0.0, 0.0} Mid transform node position.
End Position Float3 {0.0, 0.0, 0.0} End transform node position.

Output

Name Type Default Animatable Description
Angle Float 0.0 Magnitude of the angle between the three transform nodes.
Velocity Float 0.0 Magnitude of the angular velocity between the three transform nodes.
Acceleration Float 0.0 Magnitude of the angular acceleration between the three transform nodes.

Time Attributes

Name Type Default Animatable Description
Start Time Time Current frame Determines the frame at which the playback/simulation starts.
Current Time Time Current frame Current playback frame.

Scale Attributes

Name Type Default Animatable Description
Time Scale Float 1.0 Sets the scaling factor applied to the compute the velocity or acceleration. Has a range of [0.001, 10.0]. The upper limit is soft, higher values can be used.

Connect To Deformers

Sensors are meant to be connected to a deformer, tipically to a muscle deformer, so that they can automatically control attributes, enabling the deformer to react to external inputs from the scene.

When creating a sensor, a remap node for each output attribute is created. Through these remap nodes, and their output, it is possible to modulate and connect the information obtained by the sensor to a deformer and display its remapped value to its corresponding locator.

AdnLocatorPosition within a scene
Figure 4: Nodes created by an AdnSensorPosition.
AdnLocatorPosition within a scene
Figure 5: Nodes created by an AdnSensorDistance.
AdnLocatorPosition within a scene
Figure 6: Nodes created by an AdnSensorRotation.

Connecting the sensor to the target deformer can be done using the Node Editor in Maya:

AdnSensorDistance connected to the activation of an AdnMuscle
Figure 7: AdnSensorDistance connected to the activation of an AdnMuscle.

However, these connections are made in a much more user friendly way by making use of the Sensors Connection Editor presented here.

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