Hi,

I have an alembic animation with rotating geo that is moving forward (tires). The file doesn't have subframe data, so I'm using a timeblend to get that data back. Unfortunately, the timeblend seems to cause an issue with scale...the geometry shrinks and grows as I play through the timeline with 0.1 Step in the Global Animation Options.

Any idea as to why this is?

Sample alembic attached. Starts at frame 41

Thanks.

it's because the wheel object is not transforming but deforming
so what you see is per point geo interpolation

if you can't export your wheel as properly transforming geo, you can always extract transform and interpolate the transform (see file)
but I'd suggest to export it as transforming to avoid this issue as well as to get much smaller files in case you have heavy geo

tamte
it's because the wheel object is not transforming but deforming
so what you see is per point geo interpolation

if you can't export your wheel as properly transforming geo, you can always extract transform and interpolate the transform (see file)
but I'd suggest to export it as transforming to avoid this issue as well as to get much smaller files in case you have heavy geo

Ah, I see. How would I go about exporting the wheels as transforming geo? I've got a file cache with .bgeo for the wheels.
Thanks.

- for Object Level exports:
all you need to make sure is that the transform is on the object and the internal geometry is static


- for SOP level exports (probably your case):
first you need to make sure that your wheel is a packed primitive with transform applied after packing
you can doublecheck this by looking at "packedfulltransform" intrinsic attribute and making sure it's changing over time

also make sure that each packed primitive has unique primitive "path" attribute

then when exporting using ROP Alembic Output change Geometry/Packed Transform to Merge With Parent Transform

Thanks Tomas.