Pack 3-Floats [0-1] to 1-Float

PackTest.cs

using UnityEngine;
using System.Collections;

// source: http://diaryofagraphicsprogrammer.blogspot.fi/2009/10/bitmasks-packing-data-into-fp-render.html


public class PackTest : MonoBehaviour {

	void Start () {

		var myFloat = Pack3PNForFP32(new Vector3(0.1f,0.2f,0.3f));
		Debug.Log("my f:"+myFloat);

		var unPacked = Unpack3PNFromFP32(myFloat);
		Debug.Log("my u:"+unPacked);
	}


	float Pack3PNForFP32(Vector3 channel)
	{
		int uValue;
		uValue = ((int)(channel.x * 65535.0f + 0.5f));
		uValue |= ((int)(channel.y * 255.0f + 0.5f)) << 16;
		uValue |= ((int)(channel.z * 253.0f + 1.5f)) << 24;
		return (float)(uValue);
	}
	
	Vector3 Unpack3PNFromFP32(float fFloatFromFP32)
	{
		float a, b, c, d;
		int uValue;
		int uInputFloat = (int)(fFloatFromFP32);
		a = ((uInputFloat) & 0xFFFF) / 65535.0f;
		b = ((uInputFloat >> 16) & 0xFF) / 255.0f;
		c = (((uInputFloat >> 24) & 0xFF) - 1.0f) / 253.0f;
		return new Vector3(a, b, c);
	}
}