efibs / mc-lasertag-mod

public class RaycastUtil {

    /**

     * Raycasts into the direction of the crosshair

     *

     * @return The HitResult of the raycast

     */

    public static HitResult raycastCrosshair(PlayerEntity playerEntity, int maxDistance) {

        // Get the cameras position to start the raycasting from

        Vec3d startPos = playerEntity.getCameraPosVec(1.0f);

        // Get the cameras direction vector to raycast in that direction

        Vec3d direction = playerEntity.getRotationVec(1.0f);

        // Lengthen the direction vector to match maxDistance

        Vec3d ray = startPos.add(direction.x * maxDistance, direction.y * maxDistance, direction.z * maxDistance);

        // Do the block-raycast (ignore fluids) and return the result

        BlockHitResult blockHit = playerEntity.world.raycast(new RaycastContext(startPos, ray, RaycastContext.ShapeType.OUTLINE, RaycastContext.FluidHandling.NONE, playerEntity));

        Box box = playerEntity

                .getBoundingBox()

                .stretch(playerEntity.getRotationVec(1.0F).multiply(maxDistance))

                .expand(1.0D, 1.0D, 1.0D);

        // Do the entity-raycast

        EntityHitResult entityhit = ProjectileUtil.raycast(playerEntity, startPos, ray, box, entity -> !entity.isSpectator(), Double.MAX_VALUE);

        // If no entity was hit

        if (entityhit == null) {

            return blockHit;

        }

        // If entity is closer than block

        if (startPos.squaredDistanceTo(entityhit.getPos()) < startPos.squaredDistanceTo(blockHit.getPos())) {

            return entityhit;

        }

        return blockHit;