Hbm-s-Nuclear-Tech-GIT/com/hbm/calc/VectorUtil.java

package com.hbm.calc;

import net.minecraft.util.Vec3;

public class VectorUtil {
	
	public static double getCrossAngle(Vec3 vel, Vec3 rel) {
		
		vel.normalize();
		rel.normalize();

		double vecProd = rel.xCoord * vel.xCoord + rel.yCoord * vel.yCoord + rel.zCoord * vel.zCoord;
		double bot = rel.lengthVector() * vel.lengthVector();
		double angle = Math.acos(vecProd / bot) * 180 / Math.PI;
		
		return angle;
	}

}