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drawing box 在 Facebook 的最佳解答
同時也有165部Youtube影片，追蹤數超過19萬的網紅Mateusz Urbanowicz，也在其Youtube影片中提到，In collaboration with the maker of high-quality notebooks and sketchbooks, MD Paper, and the world-famous bookstore, Kinokuniya, comes a set of tools ...
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drawing box 在 Facebook 的最佳解答
Surrounded by Comfort and FUN with @pampers_sg new premium shipper and Pampers Premium Care!!
We are slowly transiting from diaper tapes to diaper pants, and our Pampers Premium care helped enable her move with great ease due to its stretchability, S-Curve design and minimal Sag due to excellent absorbency and even distribution of liquid across diaper!
You can find their new Premium Shipper (box) is now exclusively available on Lazada. It has very cute cartoons and prints that your baby can unleash his/her creativity by drawing and colouring on! Tomorrow is also Pampers’ Lazada Super Brand Day! There is going to be great promotions, giveaways and deals available!
On top of that, Pampers is running a contest! Buy the new premium care shipper from Lazada. Share you and your child’s creative use of the Premium Care boxes and stand to be one of the 3 winners to win 3 months supply of Premium Care Pampers (worth $330)!
Simply upload the picture of the end product with you and baby on your IG, explain how you and your baby creatively used the Premium Shipper box, tag 2 friends, @pampers_sg, #PampersImagineNation and #pampersclub to qualify. Remember to make your post public.
Contest ends on 27 October and winners will be announced on @pampers_sg. The three most creative answers will win! Can’t wait to see all the exciting posts! 😊
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drawing box 在 Taipei Ethereum Meetup Facebook 的精選貼文
📜 [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.
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drawing box 在 Mateusz Urbanowicz Youtube 的最佳貼文
In collaboration with the maker of high-quality notebooks and sketchbooks, MD Paper, and the world-famous bookstore, Kinokuniya, comes a set of tools chosen and designed by me for your sketching, drawing, and painting pleasure.
Read more about the box, and how to buy it, here:
https://mateuszurbanowicz.com/asbox/
Big thanks to Kinokuniya US and MD Paper for making this happen 👍
MD Paper website: https://www.midori-japan.co.jp/md/en/
Kinokuniya Seattle: https://usa.kinokuniya.com/stores-kinokuniya-seattle
Kinokuniya Online: https://united-states.kinokuniya.com/
Price:
$85.00 Online Price
$76.50 Member Price
The contents of the box:
- MD Paper Cotton Sketchbook F2 size
- Mitsubishi UNI PiN fineliner x2 (0.3 and 0.5mm)
- BLACKWING Natural pencil
- Caran D'Ache SUPRACOLOR 2 soft color pencils x8
- Tombow MONO eraser
- Kuretake ZiG BrusH2O Large (short handle)
- Faber Castell Faber 9000 sharpener
- Original booklet + MD Paper booklet
Feel free to check out my other stuff:
Gumroad: https://gumroad.com/mateusz_urbanowicz
Patreon: https://www.patreon.com/mateuszurbanowicz
Website: http://mateuszurbanowicz.com
Blog: https://artvsentropy.wordpress.com/
Twitter: https://twitter.com/gommatt
Instagram: https://www.instagram.com/mateusz_urbanowicz
drawing box 在 Peggie Neo Youtube 的最佳貼文
Eating Taco Bell's Naked Chicken Chalupa and Loaded Nachos with extra cheese!
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Thank you for watching! Check out more of my eating videos below!
Mukbang eating shows w/ Asmr eating sounds:
Chick-Fil-A Feast! Mac N Cheese https://youtu.be/4hnZzz439uU
28" Giant Pizza Slice Feast! https://youtu.be/4KCM_wLJJmA
IN-N-OUT Animal Chili Cheese Fries & Cheeseburger https://youtu.be/k-CPd6KMCR0
KFC Popcorn Nuggets & Secret Recipe Fries https://youtu.be/SKm5YKXHFM8
drawing box 在 えっちゃんねる/悦子 Youtube 的最讚貼文
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