Created
September 22, 2020 14:43
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Debug print out Alembic PolyMesh attributes
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| import alembic | |
| def _print_properties(property, depth=1): | |
| # Property name | |
| print ("\t" * depth) + property.getName() | |
| # Metadata | |
| metadata = property.getMetaData() | |
| if metadata.size(): | |
| # Can hold things like "sourceName" for UVs | |
| print ("\t" * depth) + " - metadata -> %s" % metadata | |
| # Header (check whether it's marked as UVs) | |
| header = property.getHeader() | |
| if hasattr(header, "isUV"): | |
| is_uv = header.isUV() | |
| if is_uv: | |
| print ("\t" * depth) + " - " + "header -> isUV=%s" % header.isUV() | |
| print("") | |
| # CompoundProperty print children | |
| if isinstance(property, alembic.Abc.ICompoundProperty): | |
| num_sub_properties = property.getNumProperties() | |
| for i in range(num_sub_properties): | |
| sub_property = property.getProperty(i) | |
| _print_properties(sub_property, depth+1) | |
| def print_alembic_shape_attributes(filename): | |
| filename = str(filename) # ensure str | |
| archive = alembic.Abc.IArchive(filename) | |
| root = archive.getTop() | |
| iterator = list(root.children) | |
| for obj in iterator: | |
| md = obj.getMetaData() | |
| if alembic.AbcGeom.IPolyMesh.matches(md): | |
| polymesh = alembic.AbcGeom.IPolyMesh(obj, alembic.Abc.WrapExistingFlag.kWrapExisting) | |
| schema = polymesh.getSchema() | |
| print obj | |
| uv = schema.getUVsParam() | |
| if uv.valid(): | |
| print "\t", "polymesh (UV parm)" | |
| _print_properties(uv) | |
| # Arbitrary Geometry Parms | |
| arbgeomparms = schema.getArbGeomParams() | |
| if arbgeomparms.valid(): | |
| # Should always be valid | |
| _print_properties(arbgeomparms) | |
| # User Properties | |
| user_properties = schema.getUserProperties() | |
| if user_properties.valid(): | |
| _print_properties(user_properties) | |
| print("") | |
| # include children for coming iterations | |
| iterator.extend(obj.children) | |
| path = "path/to/alembic.abc" | |
| print_alembic_shape_attributes(path) |
This was related to debugging why Houdini <-> Maya Alembic exports started behaving differently with the exported UVs, like Houdini reading Maya's map1 uv as uv, etc.
Related topics:
-
https://www.sidefx.com/forum/topic/72628/
- As mentioned there, Maya indeed export writes the "Current UV set" as
uvand passes along a "sourceName" for the UV set. However it only does so when the UV set is not!map1which makes the behavior very confusing. So, Houdini will "know" about the source UV set name as it is saved in the Alembic file (as long as it was notmap1).
- As mentioned there, Maya indeed export writes the "Current UV set" as
Hi there,
Thanks for this! Extremely helpful for a beginner with alembic! One question (forgive me if its a noob question). I have the script working and printing the shape Attributes, but I cant figure out how to print the value of the attribute - I'm expecting the attribute "myMaterialTag" to return string of "test". what am i missing? Output below:
print_alembic_shape_attributes(path)
/pSphere1/pSphereShape1
.arbGeomParams
- metadata -> .arbGeomParams
myMaterialTag
- metadata -> arrayExtent=1;isGeomParam=true;podExtent=1;podName=string
Thanks in advance for your help.
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Example output: