Detecting if user is looking at top or bottom of block

[stray trail]

Is there a way I can detect where a user is looking on a block? I'm trying to manually place a slab but i can only place a bottom half slab.

world.beforeEvents.worldInitialize.subscribe(initEvent => {
    initEvent.blockTypeRegistry.registerCustomComponent('quark:trowel_buffer', {
        beforeOnPlayerPlace: e => {
            if(!e.player) return;
            let blocks = getHotBarBlocks(e.player);
            if(blocks.length === 0) {
                e.cancel = true;
                return;
            }
            let blockToPlace = pickRandom(blocks);
            let permutation = BlockPermutation.resolve(blockToPlace.typeId);
            let cardinalDirState = permutation.getState('minecraft:cardinal_direction');
            world.sendMessage(JSON.stringify(permutation.getAllStates()));
            if(cardinalDirState) {
                let cardinalDir = getCardinalDirection(e.player);
                e.permutationToPlace = permutation.withState('minecraft:cardinal_direction', cardinalDir.toLowerCase());
            } else {
                e.permutationToPlace = permutation;
            }
            
        }
    });
});

my current code. Assume blockToPlace is a slab itemStack

[visual dust]

is this what you need?

https://learn.microsoft.com/en-us/minecraft/creator/scriptapi/minecraft/server/entity?view=minecraft-bedrock-stable#getblockfromviewdirection

[stray trail]

unfortunately no

that just gets the block, not where on the block

since i need to know if i can make the slab a top slab or not

let me record a video

[willow inlet]

You could use PlayerInteractWithBlockAfterEvent and use the faceLocation and a little bit of math to see if it's the top or bottom

https://learn.microsoft.com/en-us/minecraft/creator/scriptapi/minecraft/server/playerinteractwithblockafterevent?view=minecraft-bedrock-experimental

[stray trail]

hm

really unfortunate the event im using doesnt have that...

ill see if i can make it work

[willow inlet]

world.afterEvents.playerInteractWithBlock.subscribe(function (data) {
  let player = data.player;
  let block = data.block;
  let location = data.faceLocation;
  player.sendMessage(JSON.stringify(Vector3Utils.subtract(location, block.location)));
});

And then instead of player.sendMessage Just run your code

Make sure to subtract the block location from the face location otherwise you'll get numbers much larger than expected. Found that out the hard way

[stray trail]

thank you!

[stray trail]

function getUV(blockFace: string, faceLocation: Vector3) {
    let u = 0;
    let v = 0;
    switch(blockFace.toLowerCase()) {
        case 'up':
            u = faceLocation.x;
            v = faceLocation.z;
            break;
        case 'down':
            u = faceLocation.x;
            v = faceLocation.z;
            break;
        case 'north':
            u = faceLocation.x;
            v = faceLocation.y;
            break;
        case 'south':
            u = 1 - faceLocation.x;
            v = faceLocation.y;
            break;
        case 'west':
            u = 1 - faceLocation.z;
            v = faceLocation.y;
            break;
        case 'east':
            u = faceLocation.z;
            v = faceLocation.y;
            break;
    }
    return { u, v };
}

function subtractVector3(v1: Vector3, v2: Vector3) {
    return { x: v1.x - v2.x, y: v1.y - v2.y, z: v1.z - v2.z };
}
world.afterEvents.playerInteractWithBlock.subscribe(data => {
    let block = data.block;
    let location = data.faceLocation;
    let uv = getUV(data.blockFace, subtractVector3(location, block.location));
    data.player.onScreenDisplay.setActionBar("U: " + uv.u + " V: " + uv.v + " " + data.blockFace);
});

made a nice function to get the uv coordinates

works great!