NonStandard

// a: old position    b: new position
-(void)updateDrawPath:(CGPoint)a B:(CGPoint)b
{
    CGMutablePathRef newPath = CGPathCreateMutable();
    CGPathMoveToPoint((newPath), NULL, a.x, a.y);
    CGPathAddLineToPoint(newPath, NULL, b.x, b.y);
    CGPathAddPath(_lineToDraw, NULL, newPath);
    _lineNode.path = _lineToDraw;
}

// Creates EffectNode, add's ShapeNode. Add's Effectnode to Scene as instructed.
-(void)traceObject:(SKPlanetNode *)p
{
    _effectNode = [[SKEffectNode alloc]init];
    _lineNode = [SKShapeNode node];
    _lineToDraw = CGPathCreateMutable();
    CGPathMoveToPoint((_lineToDraw), NULL, p.position.x, p.position.y);

    _lineNode.path = _lineToDraw;
    _lineNode.strokeColor = [SKColor whiteColor];
    _lineNode.antialiased = YES;
    _lineNode.lineWidth = 3;
    [_effectNode addChild:_lineNode];
    [self addChild:_effectNode];
    _effectNode.shouldRasterize = YES;
}