🪅 Fix blosc loading #73
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Jasper-Bekkers
approved these changes
Dec 8, 2024
That investigation can easily happen async an decoupled from this PR. As the code got fixed before merging. |
rosaliedewinther
commented
Dec 8, 2024
src/reader.rs
Outdated
| @@ -229,6 +229,9 @@ impl<R: Read + Seek> VdbReader<R> { | |||
| gd: &GridDescriptor, | |||
| count: usize, | |||
| ) -> Result<Vec<T>, ParseError> { | |||
| if count == 0 { | |||
| return Ok(vec![T::zeroed(); count]); | |||
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Ya that didn't make sense. I am constructing an empty vec now.
|
I'm sorry, at the time of merging I didnt know you were still reviewing. |
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For a while we have not been able to load blosc encoded files. But that time is no more. After a significant debugging session I found out that OpenVDB does hit this check https://github.com/AcademySoftwareFoundation/openvdb/blob/master/openvdb/openvdb/io/Compression.h#L308 and does an early out if count == 0. We didnt do this check resulting in us reading
num_compressed_bytesfrom the reader, reading garbage and offsetting the reader incorrectly.I validated the results against one frame of each of JangaFX's free download models, specifically the ones listed below:
All these models now load correctly. yay.
The main problematic files remaining are specific exports I made myself with Houdini. These models use f32 for the voxel values, unlike Embergen, which uses f16.
This PR fixes #33