Extending the RenderingState class

An extended RenderingState object should contain all information to render a frame. The base class already stores information about the spatial 3D transformation of an object. Additionally, it keeps references to 2 (in the base class uninitialized) arrays: channelproperties and nonchannelproperties. The extending class should initialize and fill these arrays with required parameters.

Assuming that a very simple 3rd party rendering engine is used which renders a 3D object based on a single parameter, say brightness. Typically, the extending class would first define a static final constant with the index into the nonchannelproperties array:

public static final int BRIGHTNESS = 0;

The constructor would initialize the nonchannelproperties array:

public ExtRenderingState(int frame, CombinedTransform fwdTransform) {
		super(frame, fwdTransform);
		nonChannelProperties = new double[1];
		channelProperties = null;
}

public ExtRenderingState(
		int frame,
		double brightness,
		CombinedTransform fwdTransform) {
	this(frame, fwdTransform);
	nonChannelProperties[BRIGHTNESS] = brightness;
}

Finally, the clone() method needs to be overridden:

@Override
public ExtRenderingState clone() {
	ExtRenderingState kf = new ExtRenderingState(0, null);
	kf.setFrom(this);
	return kf;
}