javascriptthree.jsbuffer-geometry

I can't get position attribute off a bufferGeometry

I've got a line "walking around my scene" (some kind of a 3D snake) randomly and the next thing I wish to achieve is set a box around its head. The line bufferGeometry is set by 

        var positions1 = new Float32Array( MAX_POINTS * 3 ); // 3 vertices per point
        var positions2 = new Float32Array( MAX_POINTS * 3 ); // 3 vertices per point
        buffGeometry1.addAttribute( 'position', new THREE.BufferAttribute( positions1, 3 ) );
        buffGeometry2.addAttribute( 'position', new THREE.BufferAttribute( positions2, 3 ) );

I chose to set a cube (boxGeometry object) around it, and I used the following code lines to try and achieve that:

            var positioning = buffGeometry1.getAttribute('position');
            cube.position.x = positioning[0];//(line1.geometry.attributes.position.array[drawCount]);
            cube.position.y = positioning[1];//(line1.geometry.attributes.position.array[drawCount + 1]);
            cube.position.z = positioning[2];

As I debug, I see that my positioning array is undefined. so I guess something there went wrong.

Thanks.

Solution

  • Try:

    console.log(buffGeometry1.getAttribute('position'))

    My THREE.BufferGeometry shows me that verticles are stored in positioning.array so you should acces them by:

    positioning.array[0]
positioning.array[1]
positioning.array[2]