RayTracerImpl.java

// The RayTracer interface was written by me, it's not an interface from Bukkit or Minecraft
public class RayTracerImpl implements RayTracer {

    private final CachedBlockAccess cachedBlockAccess;

    public RayTracerImpl(final ChunkCacheImpl chunkCache) {
        this.cachedBlockAccess = new CachedBlockAccess(chunkCache);
    }

    @Override
    public RayTraceResult rayTraceBlocks(final Location location,
                                         final Vector direction,
                                         final int maxDistance,
                                         final FluidCollisionMode fluidCollisionMode,
                                         final boolean ignorePassableBlocks) {
        final Vector dir = direction.clone().normalize().multiply(maxDistance);
        final Vec3D startPos = new Vec3D(location.getX(), location.getY(), location.getZ());
        final Vec3D endPos = new Vec3D(location.getX() + dir.getX(), location.getY() + dir.getY(), location.getZ() + dir.getZ());
        return CraftRayTraceResult.fromNMS(location.getWorld(), this.cachedBlockAccess.rayTrace(new RayTrace(
                startPos,
                endPos,
                ignorePassableBlocks ? RayTrace.BlockCollisionOption.COLLIDER : RayTrace.BlockCollisionOption.OUTLINE,
                CraftFluidCollisionMode.toNMS(fluidCollisionMode),
                null
        )));
    }

}