对比从原版3dgs的cuda代码,fix一个关于计算mid时的笔误 #4
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从原版3dgs的cuda代码中来看,计算
mid时应该使用cov的第0个和第2个元素相加python版本和cuda版本的代码中,
cov[0],cov[1]和cov[2]应分别表示 sx, covxy, sy, 故而这里应该写为 0.5 * (cov[0] + cov[2])