October 21, 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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The Designer Starter Kit Book PDF
How to draw sneakers - book
This tutorial dives into the nuances of using diverging light sources, like projectors, to enhance your sketches.

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 make your sketches of products more real industrial design - sketching tutorial
How to make your sketches more real When you start learning how to draw as a beginner, you study and practice basic rules of perspective, line of geometry, and simple shapes such as square, circles… and so on. We are going to see something that will change your daily habit …
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From Sketching 3 Simple Forms to Product Design!
How do you Draw product design from scratch? Learn step-by-step how to draw simple forms and turn them into professional products with this video tutorial for beginner designers. There are 3 easy designs to draw and practice now! Hey guys, I’m Chou-Tac. Product design is all about taking simple forms …
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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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16 TIPS - How to Draw a Shoe | ADIDAS Sneaker Design
We draw together an Adidas sneaker design taking inspiration from my working experience when I used to work there as a footwear designer. I have prepared 16 TIPS on How to draw a sneaker for you. 16 Design tips How to draw an Adidas shoe with a marker Following the …
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Pen pressure comparison on Photoshop
CHOUTAC CHUNG – Samurai Robot Last night, I was trying some brushes in Photoshop. I would like to show you how to paint with Photoshop in 3 steps using the Pen Opacity Pressure I tried a brush that reminds me of the quality line of one of my favorite pen, …
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TIP 12 | Draw Inspiration From Your Surroundings
Does it happened to you often to lack of inspiration? When you feel like sketching, but you don’t know what to draw? Instead of looking at the blank ceiling,try to look around you. I noticed out of the window, the overhead electricity wires and high voltage power lines from the …
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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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