{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2021:PYIOGSYC4LHCV7RPGQHMVMEPZJ","short_pith_number":"pith:PYIOGSYC","schema_version":"1.0","canonical_sha256":"7e10e34b02e2ce2afe2f340ecab08fca5ead92ccad29884de7ef70d1b2f61086","source":{"kind":"arxiv","id":"2110.07145","version":2},"attestation_state":"computed","paper":{"title":"SpongeCake: A Layered Microflake Surface Appearance Model","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.GR","authors_text":"Beibei Wang, Ling-Qi Yan, Milo\\v{s} Ha\\v{s}an, Wenhua Jin","submitted_at":"2021-10-14T04:21:43Z","abstract_excerpt":"In this paper, we propose SpongeCake: a layered BSDF model where each layer is a volumetric scattering medium, defined using microflake or other phase functions. We omit any reflecting and refracting interfaces between the layers. The first advantage of this formulation is that an exact and analytic solution for single scattering, regardless of the number of volumetric layers, can be derived. We propose to approximate multiple scattering by an additional single-scattering lobe with modified parameters and a Lambertian lobe. We use a parameter mapping neural network to find the parameters of th"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2110.07145","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.GR","submitted_at":"2021-10-14T04:21:43Z","cross_cats_sorted":[],"title_canon_sha256":"31e2801e076f87babb04e19c2cea87872afba19a4d3cfab7be38eda851f9a0de","abstract_canon_sha256":"bb0506858e6adc4afc36db7a39dc85fdb37ce498f1e23ff88a0ec6434eaf5c12"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T05:47:14.201085Z","signature_b64":"lOAGEFnpDxcNmDU5gZpH8XEe4l8WjsOpJbTVhQc92xDUGHWx8IfBSpQTgS01323EkGfql+ufE95Dhw6h/aaACw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7e10e34b02e2ce2afe2f340ecab08fca5ead92ccad29884de7ef70d1b2f61086","last_reissued_at":"2026-07-05T05:47:14.200616Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T05:47:14.200616Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"SpongeCake: A Layered Microflake Surface Appearance Model","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.GR","authors_text":"Beibei Wang, Ling-Qi Yan, Milo\\v{s} Ha\\v{s}an, Wenhua Jin","submitted_at":"2021-10-14T04:21:43Z","abstract_excerpt":"In this paper, we propose SpongeCake: a layered BSDF model where each layer is a volumetric scattering medium, defined using microflake or other phase functions. We omit any reflecting and refracting interfaces between the layers. The first advantage of this formulation is that an exact and analytic solution for single scattering, regardless of the number of volumetric layers, can be derived. We propose to approximate multiple scattering by an additional single-scattering lobe with modified parameters and a Lambertian lobe. We use a parameter mapping neural network to find the parameters of th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2110.07145","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2110.07145/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"2110.07145","created_at":"2026-07-05T05:47:14.200675+00:00"},{"alias_kind":"arxiv_version","alias_value":"2110.07145v2","created_at":"2026-07-05T05:47:14.200675+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2110.07145","created_at":"2026-07-05T05:47:14.200675+00:00"},{"alias_kind":"pith_short_12","alias_value":"PYIOGSYC4LHC","created_at":"2026-07-05T05:47:14.200675+00:00"},{"alias_kind":"pith_short_16","alias_value":"PYIOGSYC4LHCV7RP","created_at":"2026-07-05T05:47:14.200675+00:00"},{"alias_kind":"pith_short_8","alias_value":"PYIOGSYC","created_at":"2026-07-05T05:47:14.200675+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/PYIOGSYC4LHCV7RPGQHMVMEPZJ","json":"https://pith.science/pith/PYIOGSYC4LHCV7RPGQHMVMEPZJ.json","graph_json":"https://pith.science/api/pith-number/PYIOGSYC4LHCV7RPGQHMVMEPZJ/graph.json","events_json":"https://pith.science/api/pith-number/PYIOGSYC4LHCV7RPGQHMVMEPZJ/events.json","paper":"https://pith.science/paper/PYIOGSYC"},"agent_actions":{"view_html":"https://pith.science/pith/PYIOGSYC4LHCV7RPGQHMVMEPZJ","download_json":"https://pith.science/pith/PYIOGSYC4LHCV7RPGQHMVMEPZJ.json","view_paper":"https://pith.science/paper/PYIOGSYC","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2110.07145&json=true","fetch_graph":"https://pith.science/api/pith-number/PYIOGSYC4LHCV7RPGQHMVMEPZJ/graph.json","fetch_events":"https://pith.science/api/pith-number/PYIOGSYC4LHCV7RPGQHMVMEPZJ/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/PYIOGSYC4LHCV7RPGQHMVMEPZJ/action/timestamp_anchor","attest_storage":"https://pith.science/pith/PYIOGSYC4LHCV7RPGQHMVMEPZJ/action/storage_attestation","attest_author":"https://pith.science/pith/PYIOGSYC4LHCV7RPGQHMVMEPZJ/action/author_attestation","sign_citation":"https://pith.science/pith/PYIOGSYC4LHCV7RPGQHMVMEPZJ/action/citation_signature","submit_replication":"https://pith.science/pith/PYIOGSYC4LHCV7RPGQHMVMEPZJ/action/replication_record"}},"created_at":"2026-07-05T05:47:14.200675+00:00","updated_at":"2026-07-05T05:47:14.200675+00:00"}