Layer helpers

Function	Returns	Description
`GetLayerForScene(scene, name)`	`Layer`	Returns the named layer within the given scene, or null if the layer does not exist.
`GetLayerByName(sceneName, layerName)`	`Layer`	Looks up a layer by scene name and layer name. Returns null if the scene or layer is missing.
`LayerHasInputNamed(layer, sourceName)`	`bool`	Returns true if the layer's current input has the given name.
`GetLayerTransformByName(sceneName, layerName)`	`LayerTransform`	Returns the `LayerTransform` of the named layer in the named scene, or null if either lookup fails.
`GetLayerOperatorByName(sceneName, layerName, operatorName)`	`object`	Returns the named operator within the named layer of the named scene, or null if any lookup fails.
`SetLayerSource(layer, sourceName)`	`bool`	Assigns a named input as the source of the given layer. Returns false if the layer is null, the source name is empty, or no input matches the name.
`GetLayerTransformByName(scene, name)`	`LayerTransform`	Returns the `LayerTransform` of the named layer within the given scene, or null if the layer is missing.
`ShowLayerByName(sceneName, layerName)`	`bool`	Sets `IsVisible` to true on the named layer. Returns false if the scene or layer is missing.
`HideLayerByName(sceneName, layerName)`	`bool`	Sets `IsVisible` to false on the named layer. Returns false if the scene or layer is missing.
`SetLayerOpacityByName(sceneName, layerName, opacity)`	`bool`	Sets the opacity of the named layer's `LayerTransform`. Returns false if the scene or layer is missing.
`SetLayerRotationByName(sceneName, layerName, rotation)`	`bool`	Sets the rotation of the named layer's `LayerTransform`. Returns false if the scene or layer is missing.
`SetLayerPositionXByName(sceneName, layerName, positionX)`	`bool`	Sets the X position of the named layer's `LayerTransform`. Returns false if the scene or layer is missing.
`SetLayerPositionYByName(sceneName, layerName, positionY)`	`bool`	Sets the Y position of the named layer's `LayerTransform`. Returns false if the scene or layer is missing.
`ExecuteOperatorCommand(selectedOperator, buttonName)`	`bool`	Executes a named `Command` button on the given `AbstractOperator`, using reflection. Returns true only if the command was found and executed successfully.
`ExecuteInteractiveCommand(layer)`	`bool`	Invokes the JS OnClick function configured on the layer's `Button` input. Returns false (and logs an error) if the layer's input is not a button.
`SetLayerAudioLevelByName(sceneName, layerName, volume)`	`bool`	Sets the linear audio gain (left, right, and stereo) on the named layer. Returns false if the scene or layer is missing.
`SetLayerAudioLeveldBByName(sceneName, layerName, volume)`	`bool`	Sets the stereo audio gain (in dB) on the named layer. Returns false if the scene or layer is missing.
`SwitchLayerSource(sceneName, layerName, sourceName)`	`bool`	Replaces the input of the named layer with the named input. Scene, layer, and input names are all matched case-insensitively. Returns false if the layer or input is missing.
`GetOperatorObject(sceneName, layerName, operatorName)`	`object`	Returns the named operator object on the named layer of the named scene. Returns false (boxed) if the scene or layer is missing; otherwise the operator object, or null if the operator does not exist.

For multiple changes at once, prefer holding a LayerTransform reference and assigning fields directly:

var t = Project.GetLayerTransformByName("Scene", "Logo");
if (t != null) {
    t.PositionX = 0;
    t.PositionY = 0;
    t.Opacity = 100;
    t.Rotation = 0;
}