ThreeJS Melon Slice Issue Analysis

Looking at your code, I've identified several issues that could be causing your melon slices not to appear or move properly:

Main Issues

1. Position Assignment: You're assigning the position object directly, which is incorrect in ThreeJS:

   JAVASCRIPTCopied
   melonSlice1.position = blocks[i0].position

2. Missing from Update Loop: You're creating melon slices but not adding them to the blocks array (your commented line), so they won't be included in your update loop.

3. Scope Issue: The variable i is declared without let/const/var, making it a global variable that could cause unexpected behavior.

Recommended Fixes

Here's how to fix these issues:

JAVASCRIPTCopied
// In your collision detection loop
for(let i0 in blocks){
    if(blocks[i0].type=="melon" && distance(blocks[i0].position, {x:cube.position.x, y:cube.position.y, z:cube.position.z}) < 2){
        delete_coin_at({x:cube.position.x, y:cube.position.y, z:cube.position.z})
        
        // Store the position before the melon is removed
        const melonPosition = {
            x: blocks[i0].position.x,
            y: blocks[i0].position.y,
            z: blocks[i0].position.z
        };
        
        // Mark the original melon as non-solid
        blocks[i0].solid = false;
        catchedCoins.push(blocks[i0]);
        
        // Create melon slices
        for(let i = 0; i < 10; i++){
            const melonSlice = new THREE.Mesh(new THREE.PlaneGeometry(1,1), melonSliceMaterial);
            
            // Set position correctly
            melonSlice.position.set(melonPosition.x, melonPosition.y, melonPosition.z);
            
            // Set movement properties
            melonSlice.Xspeed = Math.random() * 2 - 1;
            melonSlice.Yspeed = Math.random() * 1;
            melonSlice.Rspeed = Math.random() * 2 - 1;
            melonSlice.type = "melon slice";
            
            // Add to scene and blocks array
            scene.add(melonSlice);
            blocks.push(melonSlice);  // Uncomment this line!
        }
    }
}

Additional Recommendations

1. Vector3 for Position: Consider using Vector3 for positions to better manage 3D coordinates:

   JAVASCRIPTCopied
   melonSlice.position.copy(new THREE.Vector3(melonPosition.x, melonPosition.y, melonPosition.z));

2. Gravity Application: Your gravity application looks correct, but ensure your gravity constant is defined properly.

3. Lifecycle Management: Consider adding a lifespan to your melon slices so they can be removed after a certain time:

   JAVASCRIPTCopied
   melonSlice.lifespan = 100; // frames or seconds

   Then in your update loop:

   JAVASCRIPTCopied
   if(block1.type == "melon slice") {
       block1.position.x += block1.Xspeed;
       block1.position.y += block1.Yspeed;
       block1.rotation.z += block1.Rspeed;
       block1.position.y += gravity;
       
       // Decrease lifespan
       if(block1.lifespan !== undefined) {
           block1.lifespan--;
           if(block1.lifespan <= 0) {
               // Remove from scene and blocks array
               scene.remove(block1);
               const index = blocks.indexOf(block1);
               if(index > -1) blocks.splice(index, 1);
           }
       }
   }

These changes should help your melon slices appear and move as expected in your 2D platformer.