FadeFromTo Action

Overview

The FadeFromTo Action Node.

The FadeFromTo Action Node continuously modifies the Opacity of an Object over a specified period of time, thus creating an Animation. Both the initial and final values of the Opacity are chosen by the user. Find an example of how to use this Node and its effect over an Object at the end of this page.

Furthermore, visit the Actions Nodes page for a general introduction to these Nodes.

Scope: Scene, Function, Prefab.

Attributes

The FadeFromTo Action Node Attributes.

Attribute	Type	Description
From	Float	The desired initial value of the Opacity, if none is received in the From Input Socket.
To	Float	The desired final value of the Opacity, if none is received in the To Input Socket.
Duration (sec)	Float	The total time of the Action, if none is received in the Duration Input Socket.
Interpolation	Drop-down	The Interpolation method to use for calculating the intermediate values of the Opacity. It can be Linear, Sine Ease In, Sine Ease In Out, or Sine Ease Out.

Inputs

Input	Type	Description
Instance ID	InstanceID	The assigned Instance ID of the Action. If nothing is received, it automatically assigns 0 as the Instance ID.
(►) Start	Pulse	A standard Input Pulse, to trigger the execution of the Node.
Object ID	ObjectID	The ID of the target Object.
Duration	Float	The total time (in seconds).
From	Float	The initial value of the desired Opacity.
To	Float	The final value of the desired Opacity.

Outputs

Output	Type	Description
Pulse Output (►)	Pulse	A standard Output Pulse, to move onto the next Node along the Logic Branch, once this Node has finished its execution.
Instance ID	InstanceID	The assigned Instance ID of the Action.
OnStart (►)	Pulse	Flows to the next Node following FadeFromTo Action when the Action starts.
OnEnd (►)	Pulse	Flows to the next Node following FadeFromTo Action when the Action stops.

Example

This section shows a simple example of how to use the FadeFromTo Action Node and the effect it has on an Object. We start by configuring the Scene, then build the Logic, and finally show the result.

Scene Configuration

We consider a Scene with two Objects: a white arc over a black background, both of which can be easily created in the Scene Outliner. Then, we set the Size Attribute of the arc to $(500, 500, 0)$ and the Opacity to $0.25$. See this configuration in the following image:

Scene configuration.

Logic

We then need to configure the Logic. This is done in the Logic Editor.

We use first a Get Opacity Node, which allows us to obtain an Object's current Opacity value, and then the FadeFromTo Action Node, to which we will feed the value previously obtained and configure it for it to change it from there to a fixed value of our choosing.

For this purpose, we set the Attributes of the FadeFromTo Action Node in the following way:

• To: $1$

• Duration (sec): $1$

• Interpolation: Linear

We just leave the From Attribute as it is, since this value will be obtained through the corresponding Input Socket.

Then, we connect the Object ID from the white arc Object Node to the Object ID Input Socket of both Nodes, the Opacity Output from the Get Opacity Node to the From Input Socket in the FadeFromTo Node, and a Pulse through the Get Opacity Node and to the Start Input in FadeFromTo. Thus, having the following Logic configuration:

Logic configuration.

Final result

Finally, the effect of the FadeFromTo Action Node when triggered is the following:

Final result.

See Also

• FadeTo Action

External Links

• Transparency (graphic) on Wikipedia.