Hi jimenaes,
yes it's possible to do that.
by this way:
in the content wiew, add your 3 fields nedeed for the slideshow in the position "Clear" Not visible but available in the array of fields.
Add a Freetext (wysiwyg empty) in the position where you want to dispmlay your slideshow.
Add a beforerender field and make your code for the slideshow here.
The purpose is to create the html code of your slideshow and to put it in the property "Value" of the freetext field.
To make your code, you can get the value of the three fields by this way:
$data1 = $fields['field_name1']->value;
$data2 = $fields['field_name2']->value;
...
To access to a groupX value it's the same, but you will get the string of the custom storage, so you must execute a preg_match_all on this string to get all nedeed values of the groupX in an array
Something like:
$groupx = $fields['groupx_field_name']->value;
$pattern = '#::(.*?)\|(.*?)\|(.*?)::(.*?)::/(.*?)\|(.*?)\|(.*?)::#s';
preg_match_all( $pattern, $groupx, $matches );<br>
So in the $matches, you will get all data from the groupX in the array $matches.
You can adapt this pattern to your need.
Then, when the slideshow html is done, you just have to put it in the freetext :
$fields['freetext_field_name']->value = $slideshow_html;
In the beforender field you can also load all javascript nedeed (JFactory::getDocument()->addScript....)
Regards
Lionel