RayTraceHelper.java

package com.yolp900.itsjustacharm.util;

import net.minecraft.entity.Entity;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.util.math.MathHelper;
import net.minecraft.util.math.RayTraceResult;
import net.minecraft.util.math.Vec3d;
import net.minecraft.world.World;

public class RayTraceHelper {

	public static RayTraceResult rayTraceFromEntity(World world, Entity player, boolean par3, double range) {
		float f = 1.0F;
		float f1 = player.prevRotationPitch + (player.rotationPitch - player.prevRotationPitch) * f;
		float f2 = player.prevRotationYaw + (player.rotationYaw - player.prevRotationYaw) * f;
		double d0 = player.prevPosX + (player.posX - player.prevPosX) * f;
		double d1 = player.prevPosY + (player.posY - player.prevPosY) * f;
		if (player instanceof EntityPlayer)
			d1 += ((EntityPlayer) player).eyeHeight;
		double d2 = player.prevPosZ + (player.posZ - player.prevPosZ) * f;
		Vec3d vec3 = new Vec3d(d0, d1, d2);
		float f3 = MathHelper.cos(-f2 * 0.017453292F - (float) Math.PI);
		float f4 = MathHelper.sin(-f2 * 0.017453292F - (float) Math.PI);
		float f5 = -MathHelper.cos(-f1 * 0.017453292F);
		float f6 = MathHelper.sin(-f1 * 0.017453292F);
		float f7 = f4 * f5;
		float f8 = f3 * f5;
		double d3 = range;
		Vec3d vec31 = vec3.addVector(f7 * d3, f6 * d3, f8 * d3);
		return world.rayTraceBlocks(vec3, vec31, par3);
	}

}