问题
I am new in using Three JS Buffer Geometry my task is to draw Buffer Geometry Points, I have position attribute and color attribute value saved in a separate JSON file, how can I use them to populate on Buffer Geometry points? I tried FileReader function to read the JSON but its a asynchronous call. I also tried Loader of Three JS but I couldn't success. My buffer geometry code init() function loop that creates position and set color:
for ( var i = 0; i < 81; i += 3 ) {
// positions
//var x = i; //x,y,z need positions from json file
//var y = i+1;
//var z = i+3;
var x = Math.random() * n - n2;
var y = Math.random() * n - n2;
var z = Math.random() * n - n2;
positions[ i ] = x;
positions[ i + 1 ] = y;
positions[ i + 2 ] = z;
// colors
var vx = ( x / n ) + 0.5;
var vy = ( y / n ) + 0.5;
var vz = ( z / n ) + 0.5;
color.setRGB( vx, vy, vz );
colors[ i ] = color.r; //value from json file
colors[ i + 1 ] = color.g;
colors[ i + 2 ] = color.b;
}
来源:https://stackoverflow.com/questions/38112211/load-positions-attribute-from-a-json-file-in-three-js-buffer-geometry-points