利用Box2D+WCK賦予Flash物理特性 萬有引力
這已經是第五篇Box2D+WCK的介紹文章了,前面幾篇文章如果各位有注意應該會發現,所有範例的萬有引力都跟現在我們生活的環境一樣,物件像是被地心引力給吸引著都會往下方掉落,其實我們在使用這個模組的時候,也可以改變這樣的萬有引力,讓這些物件不要往下掉落而是往我們所指定的方向移動,馬老師在這邊大概製作了三種不同類型的萬有引力範例,分述如下:
1.容器型萬有引力:這個萬有引力是利用一個封閉的空間來繪製的。
大概的製作步驟如下:
我們可以在World元件中繪製一個如下圖的形狀:
接下來將他轉換成一個影片片段,在類別的部分輸入gravity.GravityCapsule的名稱,如下圖所示:
接下來把這個元件拖曳到World元件裡面就可以了。
2.放射狀萬有引力:這種萬有引力是以往內或往外放射狀的方式存在。
我們可以在World元件中繪製一個如下圖的形狀:
接下來將他轉換成一個影片片段,在類別的部分輸入gravity.GravityRadial的名稱,如下圖所示:
接下來把這個元件拖曳到World元件裡面就可以了。
3.正弦萬有引力:就是三角函數的sin。
我們可以在World元件中繪製一個如下圖的形狀:
接下來將他轉換成一個影片片段,在類別的部分輸入gravity.GravitySine的名稱,如下圖所示:
接下來把這個元件拖曳到World元件裡面就可以了。
同樣的也讓大家可以下載以上的三個範例檔,範例檔為CS5格式,下載後要重新設定來源路徑和元件庫路徑喔!希望這個範例對大家有所幫助,如果還有疑問,也可以在這邊回應唷~
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Tiny shards of plastic are increasingly infiltrating our brains, study says
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Human brain samples collected at autopsy in early 2024 contained more tiny shards of plastic than samples collected eight years prior, according to a preprint posted online in May. A preprint is a study which has not yet been peer-reviewed and published in a journal.
“The concentrations we saw in the brain tissue of normal individuals, who had an average age of around 45 or 50 years old, were 4,800 micrograms per gram, or 0.5% by weight,” said lead study author Matthew Campen, a regents’ professor of pharmaceutical sciences at the University of New Mexico in Albuquerque.
“Compared to autopsy brain samples from 2016, that’s about 50% higher,” Campen said. “That would mean that our brains today are 99.5% brain and the rest is plastic.”
That increase, however, only shows exposure and does not provide information about brain damage, said Phoebe Stapleton, an associate professor of pharmacology and toxicology at Rutgers University in Piscataway, New Jersey, who was not involved in the preprint.
“It is unclear if, in life, these particles are fluid, entering and leaving the brain, or if they collect in neurological tissues and promote disease,” she said in an email. “Further research is needed to understand how the particles may be interacting with the cells and if this has a toxicological consequence.”
The brain samples contained 7% to 30% more tiny shards of plastic than samples from the cadavers’ kidneys and liver, according to the preprint.
“Studies have found these plastics in the human heart, the great blood vessels, the lungs, the liver, the testes, the gastrointestinal tract and the placenta,” said pediatrician and biology professor Dr. Philip Landrigan, director of the Program for Global Public Health and the Common Good and the Global Observatory on Planetary Health at Boston College.
“It’s important not to scare the hell out of people, because the science in this space is still evolving, and nobody in the year 2024 is going to live without plastic,” said Landrigan, who was not involved with the preprint.
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