Hi all. How can i repeat such type of transition like https://guillaumegouessan.com/ ?
What exactly do you mean “repeat” 
? Generally, you can get such effect by making the position of camera dependent on the mouse scroll (ex. lerping the camera position along a curve or between two points, based on how far user has scrolled)
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Rainbow strips transition in? 
I apologize for the inaccurate wording of the question. i mean - transition of material with Click on some objects like table lamp
Something like THREE.Raycaster + GSAP/tween.js + modified material(s).
For some ideas, have a look at this post: How to combine gradient shader material with mesh origin material - #4 by prisoner849
Its shader in file build.js which changes lightmap color from coordinates like circle. But obfuscated and need to use https://beautifier.io/ and then code of shader will be:
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