how to simplify a mesh with good quality我测试的qem原始实现的mesh简化效果很好，用当前库实现的效果就很差

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这是qem的1997的qslim原始实现效果，对一个1.2g的mesh ply简化到0.1倍，也就是输出一个110M的mesh

这是使用当前库的，同样的设置，

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我阅读了代码，发现虽然mesh简化是同一个qem的算法内核，但是在压缩边的时候没有计算边两点瘫缩到哪个点，而是直接返回其中一个顶点，这应该是当前仓库速度很快但是效果很差的原因

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比较失望，有可能是我的调用不对？但是我已经测试了各种参数，结果差不多，虽然比qslim实现快6倍，但是结果是很一般的

[capCafu]

You're right, that's what it does, and it's on purpose. Collapsing onto an existing vertex means attributes stay intact, and skipping the solve on each edge is most of your 6x speedup.

Try meshopt_simplifyWithUpdate though. Same simplifier, but it actually moves the vertices:

destructively updates positions and attribute values for optimal appearance

Just note it rewrites your vertex buffer in place, so keep a copy first. Should get you a lot closer to QSlim.