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Code sketch2020



# 200625 Drawing Rainbow



彩虹筆刷



![200625 Drawing Rainbow](https://cheyuwu.com/static/img/sketches/923989.webp)



Created



2020-06-29 18:29:11



Updated



2025-12-30 08:03:21



Mode



p5js



Posted on IG



2020-06-29 @bosscodingplease



Contents & work details



Created



2020-06-29 18:29:11



Updated



2025-12-30 08:03:21



Mode



p5js



Posted on IG



2020-06-29 @bosscodingplease



## Note written at release



彩虹筆刷



最近午後都在下大雨，昨天出現了大彩虹 這次測試shader的暫存buffer，利用上一刻的狀態當成材質，就在GLSL中留下軌跡， 下一刻用模糊、位移和噪聲等方式變形， 就會有種彩虹筆刷留下煙霧的感覺。



## About this sketch



Testing using buffer and last frame as texture to produce trace and smoke effect in shader GLSL. [GIF https://media.giphy.com/media/XE1WnTwy3KnP2tYjI5/giphy.gif]



Films & interaction



[Interactive sketch](https://openprocessing.org/sketch/923989/embed/)


Interactive sketch[Open in a new tab ↗](https://openprocessing.org/sketch/923989/embed/)



## Where this one sits in the family tree



Part of the “Drawing Rainbow” family: 19 works, 2020-06-29 to 2024-05-07. 18 of the links are forks.


1. this one
  
  ![200625 Drawing Rainbow](https://cheyuwu.com/static/img/sketches/923989-sm.webp)
  200625 Drawing Rainbow2020-06-29
  
  [https://cheyuwu.com/sketch/923989](https://cheyuwu.com/sketch/923989)
2. child
  
  ![220102 Hypnosis](https://cheyuwu.com/static/img/sketches/1423156-sm.webp)
  220102 Hypnosis2022-01-03
  
  [https://cheyuwu.com/sketch/1423156](https://cheyuwu.com/sketch/1423156)
3. child
  
  ![220103 Eternal Flame](https://cheyuwu.com/static/img/sketches/1424812-sm.webp)
  220103 Eternal Flame2022-01-04
  
  [https://cheyuwu.com/sketch/1424812](https://cheyuwu.com/sketch/1424812)
4. child
  
  ![220109 Magic Potion](https://kyoko.openprocessing.org/thumbnails/visualThumbnail1430874@2x.jpg?hash=2022-01-08%2011%3A19%3A35)
  220109 Magic Potion2022-01-08
  
  [https://cheyuwu.com/sketch/1430874](https://cheyuwu.com/sketch/1430874)
5. child
  
  ![220110 Event Horizon](https://cheyuwu.com/static/img/sketches/1431864-sm.webp)
  220110 Event Horizon2022-01-09
  
  [https://cheyuwu.com/sketch/1431864](https://cheyuwu.com/sketch/1431864)


[The whole family (19) on the tree →](https://cheyuwu.com/lineage#f923989)



## Context & sources


- [View the sketch and code on OpenProcessing ↗](https://openprocessing.org/sketch/923989)



Exhibitions, research & collaborations

[Contact the artist ↗](https://cheyuwu.com/contact?work=200625+Drawing+Rainbow&from=/sketch/923989/)



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