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+import { LineSegments } from '../../objects/LineSegments';
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+import { VertexColors } from '../../constants';
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+import { LineBasicMaterial } from '../../materials/LineBasicMaterial';
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+import { Float32BufferAttribute } from '../../core/BufferAttribute';
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+import { BufferGeometry } from '../../core/BufferGeometry';
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+import { Color } from '../../math/Color';
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+
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+/**
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+ * @author mrdoob / http://mrdoob.com/
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+ * @author Mugen87 / http://github.com/Mugen87
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+ * @author Hectate / http://www.github.com/Hectate
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+ */
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+
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+function PolarGridHelper( radius, radials, circles, divisions, color1, color2 ) {
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+
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+ radius = radius || 10;
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+ radials = radials || 16;
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+ circles = circles || 8;
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+ divisions = divisions || 64;
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+ color1 = new Color( color1 !== undefined ? color1 : 0x444444 );
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+ color2 = new Color( color2 !== undefined ? color2 : 0x888888 );
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+
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+ var vertices = [];
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+ var colors = [];
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+
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+ var x, z;
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+ var v, i, j, r, color;
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+
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+ // create the radials
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+
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+ for ( i = 0; i <= radials; i++ ) {
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+
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+ v = ( i / radials ) * ( Math.PI * 2 );
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+
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+ x = Math.sin( v ) * radius;
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+ z = Math.cos( v ) * radius;
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+
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+ vertices.push( 0, 0, 0 );
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+ vertices.push( x, 0, z );
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+
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+ color = ( i & 1 ) ? color1 : color2;
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+
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+ colors.push( color.r, color.g, color.b );
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+ colors.push( color.r, color.g, color.b );
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+
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+ }
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+
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+ // create the circles
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+
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+ for ( i = 0; i <= circles; i++ ) {
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+
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+ color = ( i & 1 ) ? color1 : color2;
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+
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+ r = radius - ( radius / circles * i )
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+
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+ for ( j = 0; j < divisions; j ++ ) {
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+
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+ // first vertex
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+
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+ v = ( j / divisions ) * ( Math.PI * 2 );
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+
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+ x = Math.sin( v ) * r;
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+ z = Math.cos( v ) * r;
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+
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+ vertices.push( x, 0, z );
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+ colors.push( color.r, color.g, color.b );
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+
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+ // second vertex
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+
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+ v = ( ( j + 1 ) / divisions ) * ( Math.PI * 2 );
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+
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+ x = Math.sin( v ) * r;
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+ z = Math.cos( v ) * r;
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+
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+ vertices.push( x, 0, z );
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+ colors.push( color.r, color.g, color.b );
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+
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+ }
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+
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+ }
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+
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+ var geometry = new BufferGeometry();
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+ geometry.addAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
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+ geometry.addAttribute( 'color', new Float32BufferAttribute( colors, 3 ) );
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+
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+ var material = new LineBasicMaterial( { vertexColors: VertexColors } );
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+
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+ LineSegments.call( this, geometry, material );
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+
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+}
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+
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+PolarGridHelper.prototype = Object.create( LineSegments.prototype );
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+PolarGridHelper.prototype.constructor = PolarGridHelper;
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+
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+export { PolarGridHelper };
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Mr.doob