October 19, 2025

Hello! I'm Chou-Tac, a Product Designer from France.

If the sketching methods I’ve acquired aid me in my life and in my industrial design career, I believe that they can also help you reach your dream goal as a student or professional designer.

Leave a comment in the blog or send me an email at choutac@thedesignsketchbook.com : )

Chou-Tac

the designer starter kit book

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  • Chou-Tac: “Thanks Nash for being supportive to my content! :DOct 19, 22:23
  • Chou-Tac: “Hello Dani, I also believe in sketching with no tool and to master our pen. About drawing ellipses freehand, I…Oct 19, 20:07
  • Chou-Tac: “I love your motivation and excitement for design. Anytime you have a question, feel free to ask me Michael. :)…Oct 19, 19:59
  • Chou-Tac: “Awesome Stefano, anything I may help you, let me know :)Oct 19, 19:56
  • Chou-Tac: “I love that goal. :) I discovered an app called FEATHER 3D on iPad. You may have a look. It…Oct 19, 19:56

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The Designer Starter Kit Book PDF
How to draw sneakers - book

We saw previously at the How to Draw Cast Shadow using PARALLEL source light (such as the sun).
Today let’s see more about DIVERGING source light (such as 1 or multiple projectors).

The “Diverging source light” would fit better for objects you could hold in your hand for example.


How To Draw Cast Shadow with Diverging source light

How to draw Cast shadows with Diverging source light easily!

1. Draw cast shadow with multiple sources of lights

Cast shadow with 2 projectors
Cast shadow with 2 projectors


Cast shadow with a closer projector to the volume.

Try to draw a few and test a minimum of 5 different sources of light.
Take a pen and let me know how it goes in the comments below!

Note:
Try to draw Cast shadows without using any ruler to trace the straight lines.
It’s a good habit to take from the start.
If needed, you can click here to get a tutorial on how to draw straight lines without a ruler.


2. Cast shadow with front source light

The blue light come from the front of the cylinder.
The blue light comes from the front of the cylinder.

3. Cast shadow with back source light

The green light comes from the front of the cylinder.
The green light comes from the front of the cylinder.

4. Draw infinite possibilities of source lights

Feel free to resize the cylinder with rails to explore an infinity of possibilities for light sources.

The purple light comes from behind
The purple light comes from behind
Try multiple sources of lights
Try multiple sources of lights

Drawing exercise:

how to draw backpack thumbnails
Make the most of your drawing time by using the thumbnail sketching technique and get ready to masterfully draw a range of backpack designs! How To Masterfully Draw Backpacks with Thumbnails in 5 Steps TIP 1 Start by drawing basic forms TIP 2 Ask for feedback early TIP 3 Brainstorm …
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Introduction-Design-Sketching with Chou-Tac Chung -Product-Design-Class - Eindhoven University of Technology - Martijn van de Wiel
Learn how to combine digital tools and hand sketching in product design with expert tips from Martijn Van de Wiel’s class and Chou-Tac Chung …
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colour leads for mechanical pencils
Today, we talk about art material to add in your drawing tools as an artist or designer.After sketching The Grand Budapest Hotel in the plane with a Twin Marker, I wanted to practice an other great tool: The mechanical pencil with color lead. With that, you will draw better croquis! …
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7 reasons why designers use Photoshop
Thank you Chetan Yadav for sending me your question. I remember I actually asked my self the same question when I was student. Q: Do I need to be proficient in Photoshop to work in the industry ? In the Product or Transport design industry, it usually doesn’t matter which …
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Cast Shadow | Parallel source of light from the Sun
To make your sketch pop out from the background, it’s essential to add a Cast shadow. The “cast shadow” projects the shadow of an object on a surface (basically the ground surface). I basically use 2 methods at drawing the cast shadow: the Parallel source of light (Example: The sun) …
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Why I might not sketch on Ipad Pro. :(
These last few days I made a lot of research about the IPad Pro – wether it is suitable for me – as a sketcher.* I am a Wacom user for years, and I was positively impressed from what I saw online about the Apple tablet. But I promise to …
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3 comments

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  • your cylinder does my head in,I thought the light source had to be shown at a right angle to the floor but that just looks like you have drawn the light on the rail at the top, but at the front of the cylinder and then connected it to the floor at the back. :)

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