PickFramebuffer.prototype.endWithRect = function(screenSpaceRectangle) {
        var width = defaultValue(screenSpaceRectangle.width, 1.0);
        var height = defaultValue(screenSpaceRectangle.height, 1.0);

        var context = this._context;
        var pixels = context.readPixels({
            x : screenSpaceRectangle.x,
            y : screenSpaceRectangle.y,
            width : width,
            height : height,
            framebuffer : this._fb
        });

        var temp = [];
        var length = width * height;

        // Collect all objects in the captured buffer
        var i = 0;
        while (i < length) {
            colorScratch.red = Color.byteToFloat(pixels[i]);
            colorScratch.green = Color.byteToFloat(pixels[i + 1]);
            colorScratch.blue = Color.byteToFloat(pixels[i + 2]);
            colorScratch.alpha = Color.byteToFloat(pixels[i + 3]);

            var object = context.getObjectByPickColor(colorScratch);
            if (defined(object)) {
                temp.push(object);
            }

            i+=4;
        }

        // now copy only unique objects to result
        var result = [];
        for (var i = 0; i < temp.length; i++ ) {
            var current = temp[i];
            if (result.indexOf(current) < 0) result.push(current);
        }

        return result;
    };