Sixela963

So, it turns out I mostly needed a good night's sleep... I also ommited some details from my explaination that would have been necessary to understand the problem because I thought they were not relevant. I found the reason for the wrong values, and I am now working on a fix. Long story short, it's the client/server sides again. The code that modified the entity specific fields was only happening on the server, and I hadn't implemented proper entity syncing. I have now started working on that. The parts of the code that worked properly were executed only on the server, and the parts that didn't work were executed only on the client (getJumpPower() was client only because the Mecha entity is a ridden entity). When I modified the code in tick() to run on client, it showed the same problem as earlier. Marking the problem as fixed.

Hey folks. I am working on a custom "Mecha" entity (extended from LivingEntity) that the player builds up from blocks that should get modular stats depending on the used blocks. e.g. depending on what will be used for the legs, the entity will have a different jump strength. However, something unexpected is happening when trying to override a few of LivingEntity's functions and using my new own "Mecha" specific fields: instead of their actual instance-specific value, the default value is used (0f for a float, null for an object...) This is especially strange as when executing with the same entity from a point in the code specific to the mecha entity, the correct value is used. Here are some code snippets to better illustrate what I mean: /* The main Mecha class, cut down for brevity */ public class Mecha extends LivingEntity { protected float jumpMultiplier; //somewhere later during the code when spawning the entity, jumpMultiplier is set to something like 1.5f //changing the access to public didn't help @Override //Overridden from LivingEntity, this function is only used in the jumpFromGround() function, used in the aiStep() function, used in the LivingEntity tick() function protected float getJumpPower() { //something is wrong with this function //for some reason I can't correctly access the fields and methods from the instanciated entity when I am in one of those overridden protected functions. this is very annoying LogUtils.getLogger().info(String.valueOf(this.jumpMultiplier))) //will print 0f return this.jumpMultiplier * super.getJumpPower(); } //The code above does not operate properly. Written as is, the entity will not jump, and adding debug logs shows that when executing the code, the value of this.jumpMultiplier is 0f //in contrast, it will be the correct value when done here: @Override public void tick() { super.tick(); //inherited LivingEntity logic //Custom logic LogUtils.getLogger().info(String.valueOf(this.jumpMultiplier))) //will print 1.5f } } My actual code is slightly different, as the jumpMuliplier is stored in another object (so I am calling "this.legModule.getJumpPower()" instead of the float), but even using a simple float exactly like in the code above didn't help. When running my usual code, the object I try to use is found to be null instead, leading to a crash from a nullPointerException. Here is the stacktrace of said crash: The full code can be viewed here. I have found a workaround in the case of jump strength, but have already found the same problem for another parameter I want to do, and I do not understand why the code is behaving as such, and I would very much like to be able to override those methods as intended - they seemed to work just fine like that for vanilla mobs... Any clues as to what may be happening here?

Yup, I was a bit hasty in my reply. Sorry about that. Frankly, I tend to learn better in a dialog than browsing old threads. I'm still a bit fuzzy on the details of networking, but I know enough to get by for now. Quoting you from an earlier post for future reference: "PASS means you are not interested in this interaction and so it won't send a network packet to the server, making the other code pointless. Use InteractionResult.sidedSuccess(), e.g. see EggItem.use() for a simple example." Marking the topic as solved, since my code now works as intended. (to be clear: what helped me was indeed replacing the return super in the UseOn method with a "return InteractionResult.sidedSuccess(level.isClientSide)" ) If you happen to know of a place besides the forge doc and forum to learn more about the inner workings and proper use of Forge, I would be happy to learn about it.

Thanks for the quick reply! indeed, applying the same solution as in the first linked topic fixed it. However, I don't fully understand why. When returning PASS when ran on the server, does it simply stop running the code and not trigger any further events? Why was it even doing the explosion at all then? It is explicitely in a part of the code that only happens when not client side, supposedly. I did not know about how important sidedness was. Also, thank you for the link regarding velocities. I will look into them.

Hey all, pretty new here, and pretty new at modding too. I have been toying around with a basic test mod, and I am trying to get an item that, when right clicking on a certain block, explodes it and launches the player in the air. Both of those things work, but -The explosion doesn't trigger block updates. This causes any water source blocks near the explosion to simply hover in the void. -I am still unsure as to what is the propper method to change a player or entity's velocity. I currently use get and setDeltaMovement, but lerpMotion has worked too. Is there a particular method that is bound to cause less problems? Here is the relevant code: @Override public InteractionResult useOn(UseOnContext pContext) { BlockPos positionClicked = pContext.getClickedPos(); Block clickedBlock = pContext.getLevel().getBlockState(positionClicked).getBlock(); Player player = pContext.getPlayer(); Vec3 positionDifference = player.getPosition(0f).subtract(new Vec3(positionClicked.getX()+0.5f, positionClicked.getY()+0.5f, positionClicked.getZ()+0.5f)); if (positionDifference.y>0 && positionDifference.length()<2f && isBadDice(clickedBlock)) { if (pContext.getLevel().isClientSide){ player.setDeltaMovement(player.getDeltaMovement().add(0f,8f,0f)); }else{ pContext.getLevel().explode(null,positionClicked.getX()+0.5f,positionClicked.getY()+0.5f,positionClicked.getZ()+0.5f,30f, Explosion.BlockInteraction.BREAK); } } pContext.getItemInHand().hurtAndBreak(1,pContext.getPlayer(), (argplayer) -> argplayer.broadcastBreakEvent(argplayer.getUsedItemHand())); return super.useOn(pContext); } Thank you for your time!