feat: structure 3MF exports with components/assemblies for better slicing #13
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…cing Refactors the export logic to map `THREE.Group` objects to 3MF component assemblies. - Previously, exports were often treated as a single object or split strictly by mesh, making it difficult to manipulate complex multi-mesh items as single units in a slicer. - Each top-level group is now exported as a distinct build item, and its children are grouped logically using 3MF components. - This allows slicers to recognize complex assemblies as single manipulatable objects on the plate while preserving their distinct geometry. - This is a non-breaking change that significantly improves compatibility with slicer workflows. - Includes general code quality improvements and internal refactoring.
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- Replaces coordinate baking with native 3MF component transforms, preserving original geometry and improving modularity. - Implements recursive transform accumulation to correctly position sub-components in deep hierarchies. - Updates export logic to treat direct children of THREE.Scene as separate top-level objects while preserving THREE.Group objects as unified assemblies. - Fixes layout issues where nested groups were previously stacked at the origin. - Adds initial test suite for mesh, group, and scene export combinations.
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Refactors the export logic to map
THREE.Groupobjects to 3MF component assemblies.