canCollideCheck - Unknown flag is now not unknown

[Draco18s]

/**
     * Returns whether this block is collideable based on the arguments passed in Args: blockMetaData, unknownFlag
     */
    public boolean canCollideCheck(int par1, boolean par2)
    {
        return this.isCollidable();
    }

 

The par2 boolean is a flag that relates to collision raycasts, say, by the player's mouse cursor.

 

I had a dispenser-like block that I wanted to fire multiple arrows from, found that because of some offsets (so that they would be emitted from different locations, regardless of orientation) was causing some arrows to collide with the block itself.  So I looked into making the block non-collidable for that purpose.

 

Found the above function (well, knew it existed, but implemented it for an override and did this:

 

public boolean canCollideCheck(int par1, boolean par2)
    {
        return this.isCollidable() & par2;
    }

 

I could now no longer right-click interact with my block, but the arrows passed through it as desired.

 

Changed to

 

public boolean canCollideCheck(int par1, boolean par2)
    {
        return this.isCollidable() | par2;
    }

 

And retained the desired behavior and regained the ability to interact with it.

 

Scratch that, was a total fluke due to the RNG.

(There are 4 spots my arrows fire from, two of them collide, two don't, the test I thought things worked right was just a fluke of the RNG picking the two that worked).

 

Back-tracing the code it appears that this boolean is true if and only if the player right-clicks while holding a boat.  I suspect that this code is used to place the boat on top of water rather than underneath.

[LexManos]

Either way this doesn't belong here.

We are not the curators of vanilla code documentation.

http://mcp.ocean-labs.de/index.php/MCPBot

[Draco18s]

We are not the curators of vanilla code documentation.

 

I actually had no idea.