Change appearance of a block (add vines) by using a custom item

[modder819]

I defined a custom item, ItemGrapevine.  When I use an equipped grapevine item, I'd like it to have the same behavior as the vanilla "vine" item:

 

When the item is equipped and used when the player is standing in front of a block, the block changes appearance so that it is covered in vines.

 

What code do I need in the ItemGrapevine class to implement this behavior?

[Draco18s]

Oh god, you're in for a world of trouble.

Getting the visuals is one thing, allowing to climb it is another. Ladders (and vines) are climbable due to the collision box and other properties that the block has. If the block isn't real, you can't mimic that behavior.

[modder819]

I'm just looking to implement the visual effect.

[Draco18s]

Still troublesome, but possible. I know I've seen people do similar things before.

Trying to think of how to search for it...

Try these:

 

[jabelar]

Actually, I think it is the opposite. It isn't THAT hard to make a block that copies vanilla vine behavior, including making it climbable (you just need to override the isLadder() method to return true and make sure the collision box is amenable.

 

It would be harder, almost impossible, to create a visual vine effect without making a block.

 

In any case, what have you tried so far? Why not start by copying the vanilla block code, or maybe even just extending it? The fields in BlockVine are either public or protected, so extending it would work well.

[Draco18s]

17 minutes ago, jabelar said:

Actually, I think it is the opposite. It isn't THAT hard to make a block that copies vanilla vine behavior, including making it climbable (you just need to override the isLadder() method to return true and make sure the collision box is amenable.

oh, absolutely you can do this.

But the block needs to exist in the world. It can't be phantom.

3 hours ago, modder819 said:

when the player is standing in front of a block, the block changes appearance so that it is covered in vines.

 

Edited July 15, 2018 by Draco18s

[jabelar]

I agree he mentioned that he wanted the appearance. But he also said: 

Quote

I'd like it to have the same behavior as the vanilla "vine" item:

 

I think maybe he doesn't understand that vanilla vines are more than just appearance, and that having something that could change the appearance of any block would (as you're already explaining to him) be quite difficult to achieve.