EntityUtils.java

public class EntityUtils {
    public static void lookAt(EntityPlayer player, double x0, double y0, double z0) {
        Vec3d pos = joazlazer.mods.amc.utility.MathHelper.toVec3d(te.getPos());
        Vec3d eyePos = Minecraft.getMinecraft().player.getPositionVector().add(new Vec3d(0f, Minecraft.getMinecraft().player.getEyeHeight(), 0f));
        Vec3d difference = pos.subtract(eyePos);
        Vec3d normal = difference.normalize();
        double yaw = Math.atan2(normal.z, normal.x);
        double xz = Math.sqrt(normal.x * normal.x + normal.z * normal.z);
        double pitch = Math.atan2(normal.y, xz);

        player.rotationPitch = (float) pitch;
        player.rotationYawHead = (float) yaw;
    }
}