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physics.setGravity()
Description:
Sets the x,y components of the global gravity vector, in units of m/s2. The default is ( 0, 9.8 ) to simulate standard Earth gravity, pointing downwards on the y-axis.
設置 x,y分量的全球重力載體,單位 m/s2。默認為(0,9.8)的標準來模擬地球引力,向下在Y軸。
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