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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]cov[2] 应分别表示 sx, covxy, sy, 故而这里应该写为 0.5 * (cov[0] + cov[2])

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