In the past I wrote a couple of tutorials on this topic here:
Filterable Portfolio Grid in Altitude Pro with Title and Excerpt appearing on Hover
This article is different from the above in that the hover effect is a simple one with opacity change and clicking anywhere on the featured image takes the visitors to the single portfolio item. Also we are going to use the latest version of Isotope (v2.2.2 as of today).
After implementing the steps in this tutorial the Portfolio Custom Post Type archive page will display a grid of Portfolio items' featured images filterable by their categories (automatically generated).
Screenshot:
Screencast:
Step 1
Install and activate Portfolio Post Type plugin.
Step 2
Go to Portfolio > Add New Item and add your Portfolio items. Make sure to set a Featured image for each.
Step 3
Add the following in Altitude Pro's functions.php:
