Kévin Dietrich
f3a475a767
Both the Alembic and USD libraries use double precision floating point numbers internally to store time. However the Alembic I/O code defaulted to floats even though Blender's Scene FPS, which is generally used for look ups, is stored using a double type. Such downcasts could lead to imprecise lookups, and would cause compilation warnings (at least on MSVC). This modifies the Alembic exporter and importer to make use of doubles for the current scene time, and only downcasting to float at the very last steps (e.g. for vertex interpolation). For the importer, doubles are also used for computing interpolation weights, as it is based on a time offset. Although the USD code already used doubles internally, floats were used at the C API level. Those were replaced as well. Differential Revision: https://developer.blender.org/D13855
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: WARNING: Could not obtain image size. :scale: option is ignored.
Note the preview is not accurate and warnings may not indicate real issues.
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