How do I make objects complete with page scrolling?

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I found this site while surfing the internet, and found it an incredible thing that I can not do.

I do not really know how to search for something. Does anyone know how I go about completing such objects according to the Scroll of the mouse?

Underneath the title The Studio has an animation on the lines, they are complete.

A little further down is the pencil and computer that are completing too, I find this incredible.

Someone has a clue how to do this, or what I can look for to learn about.

    
asked by anonymous 04.11.2017 / 00:30

0 answers