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以前因為freelance job, 多數耍畫很大張, 例如 map, artist’s impression, 現在不做, 所以trim細去大概 A3.
大張的水彩紙其實好多靚野, 水彩化色效果很好, 只是不方便.
我以前喜歡用的大度水彩紙, 牌子包括Fabriano ( 少少紋), Saunders Waterford (滑面), Arches (滑面).
如果同學們覺得很難找到現成 A3 pad 的滑面紙, 可考慮買大張, 以上三種效果很好的, 只需買多一個cutting mat, 鐵尺 + 界刀.
去到 art supply shop 拿個紙版慢慢選擇, 記得不耍買太薄
📜 [專欄新文章] Gas Efficient Card Drawing in Solidity
✍️ Ping Chen
📥 歡迎投稿： https://medium.com/taipei-ethereum-meetup #徵技術分享文 #使用心得 #教學文 #medium
Assign random numbers as the index of newly minted NFTs
Scenario
The fun of generative art NFT projects depends on randomness. The industry standard is “blind box”, where both the images’ serial number and the NFTs’ index are predetermined but will be shifted randomly when the selling period ends. (They call it “reveal”) This approach effectively solves the randomness issue. However, it also requires buyers to wait until the campaign terminates. What if buyers want to know the exact card right away? We’ll need a reliable onchain card drawing solution.
The creator of Astrogator🐊 isn’t a fan of blind boxes; instead, it thinks unpacking cards right after purchase is more interesting.
Spec
When initializing this NFT contract, the creator will determine the total supply of it. And there will be an iterable function that is randomly picking a number from the remaining pool. The number must be in range and must not collide with any existing ones.
Our top priority is accessibility/gas efficiency. Given that gas cost on Ethereum is damn high nowadays, we need an elegant algorithm to control gas expanse at an acceptable range.
Achieving robust randomness isn’t the primary goal here. We assume there’s no strong financial incentive to cheat, so the RNG isn’t specified. Implementers can bring their own source of randomness that they think is good enough.
Implementation
Overview
The implementation is pretty short and straightforward. Imagine there’s an array that contains all remaining(unsold) cards. When drawIndex() is called, it generates a (uniform) random seed to draw a card from the array, shortens the array, and returns the selected card.
Algorithm
Drawing X cards from a deck with the same X amount of cards is equal to shuffling the deck and dealing them sequentially. It’s not a surprise that our algorithm is similar to random shuffling, and the only difference is turning that classic algo into an interactive version.
A typical random shuffle looks like this: for an array with N elements, you randomly pick a number i in (0,N), swap array[0] and array[i], then choose another number i in (1,N), swap array[1] and array[i], and so on. Eventually, you’ll get a mathematically random array in O(N) time.
So, the concept of our random card dealing is the same. When a user mints a new card, the smart contract picks a number in the array as NFT index, then grabs a number from the tail to fill the vacancy, in order to keep the array continuous.
Tweak
Furthermore, as long as the space of the NFT index is known, we don’t need to declare/initialize an array(which is super gas-intensive). Instead, assume there’s such an array that the n-th element is n, we don’t actually initialize it (so it is an array only contains “0”) until the rule is broken.
For the convenience of explanation, let’s call that mapping cache. If cache[i] is empty, it should be interpreted as i instead of 0. On the other hand, when a number is chosen and used, we’ll need to fill it up with another unused number. An intuitive method is to pick a number from the end of the array, since the length of the array is going to decrease by 1.
By doing so, the gas cost in the worst-case scenario is bound to be constant.
Performance and limitation
Comparing with the normal ascending index NFT minting, our random NFT implementation requires two extra SSTORE and one extra SLOAD, which cost 12600 ~ 27600 (5000+20000+2600) excess gas per token minted.
Theoretically, any instantly generated onchain random number is vulnerable. We can restrict contract interaction to mitigate risk. The mitigation is far from perfect, but it is the tradeoff that we have to accept.
ping.eth
Gas Efficient Card Drawing in Solidity was originally published in Taipei Ethereum Meetup on Medium, where people are continuing the conversation by highlighting and responding to this story.
👏 歡迎轉載分享鼓掌
☕️思如泉湧·咖啡☕️
前陣子投稿了金車文教基金會舉辦的咖啡插畫獎
很開心能夠獲選！
謝謝評審的肯定
.
法國作家奧雷諾說咖啡是文學創作的夥伴，而我認為咖啡更是所有從事藝術創作者的靈藥 ; 不管是腸枯思竭時、缺乏勇氣前進時、面對生活苦悶時、或是提案未果時，喝上一口香濃溫熱的咖啡，瞬間彷彿上天降下甘霖，福臨心至。
金車文藝中心 KCCA
Texture True Grit Texture Supply
#sophiasartwork #illustration#illustrator#coffee #kingcarart #digitalart #truegrittexturesupply #procreate #art#artwork
พื้นและผนังไม้ไม่จำเป็นต้องเป็นลายเดิมๆ เสมอไป คลิปนี้เราสองคนพาไปที่ O2E Supply Flagship Store ที่ตึก FYI Center ซึ่งเป็นแห่งแรกในไทยที่เปิดโอกาสให้เราสามารถออกแบบลวดลายของพื้นและผนังไม้หรูที่เป็นงานศิลปะแนว Art Deco สุดปราณีตจากอิตาลีได้ด้วยตัวเอง นอกจากนี้ก็ยังมีเฟอร์นิเจอร์ไม้หรูให้จับเข้าคู่กับพื้นและผนังไม้ด้วย
ใครที่ชื่นชอบลวดลายไม้แบบนี้ ลองแวะเข้าไปชมได้ตัวเองที่ O2E Supply Flagship Store หรือเข้าไปดูภาพเพิ่มเติมได้ที่ Instagram ของ O2E ครับ
FB page : Foglie d’Oro and Arte Brotto Bangkok
IG : o2esupply
Line : @o2esupply
Showroom : FYI CENTER, ตึก 2 ชั้น G, ถนน พระราม 4
วันทำการ (จันทร์-เสาร์ เวลา 09.30 น.-19.30 น.)
Tel : 02-1944769-70 ,099-451-5688 ,081-841-4677
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*Disclosure: คลิปวิดีโอนี้ ได้รับการสนับสนุนจาก O2E Supply*
สมัครเป็นสมาชิกของช่อง spin9 เพื่อสนับสนุนการผลิตคอนเทนต์ของเราได้ที่นี่:
https://www.youtube.com/channel/UCovADuA7KBuMFORurTzL86A/join
首張專輯 開門主打 首波單曲《孔雀》
＿
在流言與偏見川流不息的數位高速公路上，沈默的人顯得老派。
眾聲喧嘩的社交動物園裡，你要成為孔雀還是＿＿?
#孔雀 #Colbie王思涵 #馬來西亞歌手
＿
《孔雀》Colbie王思涵即將發行的第一張專輯《C班人生》的開門主打，以忠於自己的本色宣言，打開這張專輯要傳達的信念。Colbie平日寡言抽離，對於各種亂象看似懶於討論，實則，他選擇了音樂作為他與世界溝通的渠道。
《孔雀》是一首充滿都市感的City Pop，編曲層次豐富，以一種拒絕被標籤拒絕蹭熱度的態度，對社會發出的噪音提出疑問，人是不甘寂寞的孔雀嗎？總在流量與話題中穿梭，沈默的優雅似乎已經是一件老派的事，然而人一多話就聒噪，原本是鳳凰，卻在自己的偏見裡淪為麻雀。
《孔雀》單曲MV找來馬來西亞近年竄紅的年輕時尚攝影師兼導演Nelson Chong張慈軒操刀，以燈光與復古的場景，強化Colbie新御宅族的印象，厭世而美麗，抽離而不孤立，導演說，每一個鏡頭，他都務必讓自己有戀愛的感覺才過關。
Colbie除了在MV裡扮演自己，也特別拜師學了一段難度甚高的Finger Tutting (手指舞)，雖然只有短短八個小節，卻經過一個多月的苦練才獲得老師肯定。該手指舞寓意著自由與框架，以及在百鳥爭鳴的社會裡表達自己的難度。
? 孔雀 ?
我 有一雙優雅的平底鞋
走 走過那 髒亂的每條小街
穿過流言 隨便素著 一張臉
若不想聽見 我就聽不見
我總覺得星座太玄
難道都怪水逆太常見
對於廣告感到疲倦
只眷戀牛仔褲的體貼
不夠禮貌也不夠賤
不懂人們所謂的體面
別急著給我標籤
你看到的我不過一面
不想直播我的晝夜
愛或不愛都很直接
我不住在動物園裡
當不了僅供觀賞的孔雀
我 總被捲在話題裡周旋
七 嘴八舌 全是傲慢與偏見
這個世界 不缺你我 的觀點
百鳥在爭鳴 鳳凰變麻雀
所有人都想被看見
大好青春誰肯收斂
我替網紅感到疲倦
人生都快被流量終結
從未問過你的意見
意見總是隨便又膚淺
如果不懂怎麼聊天
用表情符號 再說一遍
不想直播我的晝夜
愛或不愛都很直接
我不住在動物園裡
當不了僅供觀賞的孔雀
城市裡堆積了太多寂寞 很難被消滅
低調浮誇都渴望 被了解
數位聆聽：https://rock-mobile.lnk.to/colbiepeacock
＿
詞 / 丁丁
OP / Funkie Monkies Publishing Pte Ltd
SP / Warner Chappell Music, Hong Kong Limited Taiwan
曲 / Colbie王思涵、王保為、林軒羽
OP / Super Fun Entertainment PLT
OP / Warner Chappell Music, Hong Kong Limited Taiwan
OP / 小品音樂工作室SmallBox Music
SP / Warner Chappell Music, Hong Kong Limited Taiwan
音樂製作
製作人 Producer / Colbie王思涵、管啟源、Clement蕭啟賢
配唱製作人 Vocal Producer / 管啟源
編曲 Music Arrangement / Bowie Ong
Additional Programming / Clement蕭啟賢、JSAW
吉他 Guitars / Bowie Ong
低音吉他 Bass / Ken Chung
和聲編唱 / Colbie王思涵
錄音師 Recording Engineer / Hanz郭文翰
混音師 Mixing Engineer / Hanz郭文翰
錄音室 Recording Studio / Vocast Studios
母帶後期處理 Mastering / CL TOH
母帶後期處理錄音室 Mastering Studio / Mastering One
數位發行 / 香港商華納音樂出版有限公司台灣分公司
Digital Distributer / Warner Chappell Music, Hong Kong Limited Taiwan Branch
＿
影像製作
出品 Production / 大茶飯娛樂經紀 Super Fun Entertainment PLT
製片 Producer / Colbie王思涵、管啟源
導演 Director / Nelson Chong 張慈軒、Mandy Gioh 楊淑琳
導演助理 Assitant Director / George Chong 張喬治
攝影指導 Director Of Photography / Nicholas Chin 陈伟忠
美術指導 Art Director / Mandy Gioh 楊淑琳
燈光 Gaffer / Arianto Bin Mintek (Anto)
燈光助理 Best Boy / Liew Kuok Ken (Ken) 、Edwin Lye Er Hou (Hou Zai) 、Koala Loh
攝影助理 / Meor Nazrin、Jeffery Teong、Skaiste Kazragyte
剪接 Editor / Erik Moh 巫志隆
調光師 Colorist / NC Nicole 霓可樂
化妝師 Make Up Artist / Rachel Seok @ PLIKA MAKEUP
髮型師 Hair Stylist / Kay Tuan @ CENTRO HAIR SALON
藝人助理 Artist Assitant / Kwan
手指舞編導 Finger Tutting Choreographer / Joey Montut
古董家具提供 Vintage Furniture Supply / Eddy Sih
古董樂器提供 Vintage Music Equipment Supply / Shawn @ Sonica
不是路人甲 The Actors /
馮俊傑、EstherQuinn、Allen Yeoh、Edward Low、黃龍坤 、Wilson Sam、Floyd、Chunyau
特別鳴謝 Casting Manager / 陳奕君
In this episode of Best in Beauty, I get my nails done by one of Singapore’s top nail artist! Like this video and subscribe to my channel if you enjoy this series! https://bit.ly/2JFCtDr
?? Follow me http://instagram.com/tina_yong
Ying’s Instagram
https://www.instagram.com/nailartexpress/
https://www.instagram.com/thenailartelier/
Nail Supply Shop
https://www.instagram.com/nailwonderlandsg/
https://nailwonderland.com/
Watch more Nail video:
Japanese Celebrity Nail Artist Gave Me Extreme 3D Nail Art https://www.youtube.com/watch?v=ob2Lo0sFrtI&t=6s
Visiting a Korean Nail Salon - How much does it cost? https://www.youtube.com/watch?v=RdC2rVhrnwc&t=264s
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Music by Alexi Blue - Easy Love - https://thmatc.co/?l=309E20BB
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art supply 在 Art Supply Store - Facebook 的美食出口停車場
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