Bug in PackedGaussians::at(int i)

[fortmeier]

When going through the list of loaded packed gaussians, the last one gaussian is out of bounds.
In the following code snippet, the last element is skipped to make it work.

spz::PackedGaussians packed = spz::loadSpzPacked(path);
std::vector<spz::UnpackedGaussian> gaussians;
for (int i = 0; i < packed.numPoints-1; i++) {
    spz::UnpackedGaussian gaussian = packed.unpack(i);
    gaussians.push_back(gaussian);
}

(code in context: https://github.com/fortmeier/klartraum/blob/17a3d3860d30f263b0db660ad3ccab32859a5e7b/src/vulkan_gaussian_splatting.cpp#L301)

I think the issue is these lines:

spz/src/cc/load-spz.cc

Line 346 in bf30541

std::copy(&scales[start3], &scales[start3 + 3], result.scale.data());

[fortmeier]

I think I found the issue, please review the PR: #18