I was wondering if anyone had an idea on how to make the screen shake.

I have a custom entity and I want to make the screen shake when it walks as it's a giant.

I think I will handle this inside of the playStepSound() method, however I have no clue on how to perform this shake effect.

Does anyone have an idea please ?

Forge has events for changing the camera angles and field of view.

See ViewportEvent and its subclasses.

So you can rotate the screen and zoom in/out.

 

But to move the position of the camera, you need to move the player's eye position (or the eye position of the entity the player is spectating).

To do that you have to either physically move the player or do something that changes their dimensions. e.g. changing the player's net.minecraft.world.entity.Pose, like sneaking

Alright, I will take a look at these classes, I think I will find what I want, thanks for your help !!

Ok so now I am running into an issue.

I made the following code to basically affect every player which is in a certain box around the mob.

However, the players are ok, but the setDeltaMouvement() method doesn't make something at all.

I also tried player.jumpFromGound(), it doesn't work either.

Am I missing something ??

@Override protected void playStepSound(BlockPos pPos, BlockState pState) {
		int affectedRadius = 8;
		List<Player> players = this.level.getEntitiesOfClass(Player.class, new AABB(
		  this.getBlockX() + affectedRadius,
		  this.getBlockY() + affectedRadius,
		  this.getBlockZ() + affectedRadius,
		  this.getBlockX() - affectedRadius,
		  this.getBlockY() - affectedRadius,
		  this.getBlockZ() - affectedRadius));
		
		if (!players.isEmpty()) {
			players.forEach(player -> {
				Alcamod.LOGGER.info("Affecting " + player.getName());
				player.setDeltaMovement(player.getDeltaMovement().with(Direction.Axis.Y, 0.4D));
			});
		}
		
		this.playSound(AlcaSoundEvents.CRYSTAL_GOLEM_STEP.get(), 1.0F, 0.6F);
	}

 

Most entity movement calculations (which I believe is where the method you are using is called from?) happens on the server.

But player movement is usually calculated on the client. The "deltaMovement" isn't even sent by the client to the server for players so it is not very useful on the server.

 

There is a ClientBoundSetEntityMotionPacket you can send from the server to the client to update the value.

You can see it being used in for example Player.attack() when it updates the deltaMovement for a ServerPlayer.

Indeed, it explains it all.

I looked at its use in Player.attack() and I got it working, just sending the new packet after setting the deltaMouvement fixed the issue.

It was kind of simple in the end, but I would not have got it without you, thanks  !