92d85a85ad
In some cases, using the Scrape Multiplane brush in Dynamic mode, the brush stroke will have no vertices to sample from to find the associated planes used to calculate deformations. This results in attempting to divide by 0. To make this potential error case more obvious, this commit changes the helper method `sample_surface` to instead return a `std::optional` of `ScrapeSampleData` in the rare occurance that we have no samples, so that calling code is required to handle this case explicitly. Pull Request: https://projects.blender.org/blender/blender/pulls/132573
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