(SOLVED) [1.17.1] Getting Entity That Player Is Pointing At

[Warven22]

I need to know how to get the mob a player is pointing at from some distance (not just regular reach distance). I looked around quite a lot in both Google and source code, but I find myself stumped, confused, and unsure.

I attempted this:

public static EntityHitResult getTargetedEntity(Player player) {
  Vec3 start = player.getEyePosition();
  Vec3 addition = player.getLookAngle().multiply(new Vec3(10000D, 10000D, 10000D));
  return ProjectileUtil.getEntityHitResult(
  	player.level, 
  	player,
  	start,
  	start.add(addition),
  	player.getBoundingBox().expandTowards(player.getDeltaMovement()).inflate(1.0D),
	(val) -> true);
}

It seems to work, but the range is very short regardless of the number I multiply with.

Am I misunderstanding this function? Is there a better way to get the entity the player is pointing at?

Edited November 23, 2021 by Warven22
Solved

[poopoodice]

The problem is it's only gathering the entities that are inside/intersects with the bb:

player.getBoundingBox().expandTowards(player.getDeltaMovement()).inflate(1.0D)

So make the bounding box bigger.

[Warven22]

  On 11/20/2021 at 10:25 AM, poopoodice said:

The problem is it's only gathering the entities that are inside/intersects with the bb:

player.getBoundingBox().expandTowards(player.getDeltaMovement()).inflate(1.0D)

So make the bounding box bigger.

Expand  

I've tried expandingTowards using

player.getLookAngle().multiply(new Vec3(10000D, 10000D, 10000D));

rather than the player's movement (since movement can be 0), along with an inflate of a similarly large number. My range seems to have increased, but not as expected, as if I'm not visualizing how these changes to the bounding box actually affects anything. Can I set up this bounding box to be drawn in the debug elsewhere?

I feel like I do not understand how the ProjectileUtil works. I don't like the idea that I'm "shooting" the player towards a point, but it seems to be the only way.

Is there no other way for this to be done? No raycast function? No better way all the other modders use?

[Luis_ST]

  On 11/20/2021 at 2:23 PM, Warven22 said:

I've tried expandingTowards using

Expand  

did you read poopoodice post? since expanding the LookAngle != BoundingBox

[Warven22]

  On 11/20/2021 at 3:02 PM, Luis_ST said:

did you read poopoodice post? since expanding the LookAngle != BoundingBox

Expand  

I should have made it more clear that I did try that solution and what I actually did:

Vec3 start = player.getEyePosition();
Vec3 addition = player.getLookAngle().multiply(new Vec3(1000000D, 1000000D, 1000000D));
return ProjectileUtil.getEntityHitResult(
  player.level, player,
  start, start.add(addition),
  player.getBoundingBox().expandTowards(addition).inflate(1000000D), (val) -> true);

It didn't seem to work, as the range doesn't seem as big as it should be, needing me to be a few blocks (around 10) away rather than anything in view.

Edited November 20, 2021 by Warven22
clarification, less snarky wording

[Warven22]

bump

[Warven22]

Please forgive this additional bump, but I want to assist future google visitors by sharing my solution.

I have found a solution by using a combination of two different functions: ProjectileUtil.getEntityHitResult & Item.getPlayerPOVHitResult.

getEntityHitResult doesn't take into account player's rotation. getPlayerPOVHitResult is for blocks, but takes into account player's rotation. So by using the positions from getPlayerPOVHitResult, creating a bounding box from it, and using the loop for entities in getEntityHitResult, it creates a raycast function that fires from the player's eyes to where they are pointing.

I'm not sure if any of that is right, but one thing I'm sure of is it works. If you increase the range to a high number, you can detect an entity quite far away.

public static EntityHitResult getPlayerPOVHitResult(Player player) {
  float playerRotX = player.getXRot();
  float playerRotY = player.getYRot();
  Vec3 startPos = player.getEyePosition();
  float f2 = Mth.cos(-playerRotY * ((float)Math.PI / 180F) - (float)Math.PI);
  float f3 = Mth.sin(-playerRotY * ((float)Math.PI / 180F) - (float)Math.PI);
  float f4 = -Mth.cos(-playerRotX * ((float)Math.PI / 180F));
  float additionY = Mth.sin(-playerRotX * ((float)Math.PI / 180F));
  float additionX = f3 * f4;
  float additionZ = f2 * f4;
  double d0 = ZapEffect.RANGE;
  Vec3 endVec = startPos.add((double)additionX * d0, (double)additionY * d0, (double)additionZ * d0);
  AABB startEndBox = new AABB(startPos, endVec);
  Entity entity = null;
  for(Entity entity1 : player.level.getEntities(player, startEndBox, (val) -> true)) {
	AABB aabb = entity1.getBoundingBox().inflate(entity1.getPickRadius());
	Optional<Vec3> optional = aabb.clip(startPos, endVec);
    if (aabb.contains(startPos)) {
      if (d0 >= 0.0D) {
        entity = entity1;
        startPos = optional.orElse(startPos);
        d0 = 0.0D;
      }
    } else if (optional.isPresent()) {
      Vec3 vec31 = optional.get();
      double d1 = startPos.distanceToSqr(vec31);
      if (d1 < d0 || d0 == 0.0D) {
        if (entity1.getRootVehicle() == player.getRootVehicle() && !entity1.canRiderInteract()) {
          if (d0 == 0.0D) {
            entity = entity1;
            startPos = vec31;
          }
        } else {
          entity = entity1;
          startPos = vec31;
          d0 = d1;
        }
      }
    }
  }

  return (entity == null) ? null:new EntityHitResult(entity);
}