{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:2K3TKT3IPPKUIDLTOHYP3KI3NP","short_pith_number":"pith:2K3TKT3I","canonical_record":{"source":{"id":"1310.1854","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-10-07T16:37:32Z","cross_cats_sorted":[],"title_canon_sha256":"e3a9e2bab806690f1be7f9202c9f517cd79da41ae8be2cb2230be7f77c17962c","abstract_canon_sha256":"7a60e0d6b33cc313dc21a53aa451a6d79cc7e5ddcb44a18b6d1b7a5aedfe6c57"},"schema_version":"1.0"},"canonical_sha256":"d2b7354f687bd5440d7371f0fda91b6bee7add3617763d1558aeba8740b9b05f","source":{"kind":"arxiv","id":"1310.1854","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1310.1854","created_at":"2026-05-18T01:47:14Z"},{"alias_kind":"arxiv_version","alias_value":"1310.1854v1","created_at":"2026-05-18T01:47:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1310.1854","created_at":"2026-05-18T01:47:14Z"},{"alias_kind":"pith_short_12","alias_value":"2K3TKT3IPPKU","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_16","alias_value":"2K3TKT3IPPKUIDLT","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_8","alias_value":"2K3TKT3I","created_at":"2026-05-18T12:27:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:2K3TKT3IPPKUIDLTOHYP3KI3NP","target":"record","payload":{"canonical_record":{"source":{"id":"1310.1854","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-10-07T16:37:32Z","cross_cats_sorted":[],"title_canon_sha256":"e3a9e2bab806690f1be7f9202c9f517cd79da41ae8be2cb2230be7f77c17962c","abstract_canon_sha256":"7a60e0d6b33cc313dc21a53aa451a6d79cc7e5ddcb44a18b6d1b7a5aedfe6c57"},"schema_version":"1.0"},"canonical_sha256":"d2b7354f687bd5440d7371f0fda91b6bee7add3617763d1558aeba8740b9b05f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:47:14.373379Z","signature_b64":"AUOAhKhvoaZ1LOsN01TwQrmzw5q48W5koabPRMrnrajy9Tc9a1BtEMH5p1iMVRkEotfJNi54WgmAybysf+pEDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d2b7354f687bd5440d7371f0fda91b6bee7add3617763d1558aeba8740b9b05f","last_reissued_at":"2026-05-18T01:47:14.372657Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:47:14.372657Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1310.1854","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:47:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"o0XrX7G30ZFtZp7X25f+AoecVsqdEfv2DkqA6Qhx/wi3czYQFaBSySLvHs/VBT72MJUMFtunWiza+R/C8X6UAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-18T19:41:53.969384Z"},"content_sha256":"e555cf2ee5070dbcb5b677d54bc24cb4085a60301213de3d7cbdae0599d93c39","schema_version":"1.0","event_id":"sha256:e555cf2ee5070dbcb5b677d54bc24cb4085a60301213de3d7cbdae0599d93c39"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:2K3TKT3IPPKUIDLTOHYP3KI3NP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Using 3D Voronoi grids in radiative transfer simulations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Maarten Baes, Peter Camps, Waad Saftly","submitted_at":"2013-10-07T16:37:32Z","abstract_excerpt":"Probing the structure of complex astrophysical objects requires effective three-dimensional (3D) numerical simulation of the relevant radiative transfer (RT) processes. As with any numerical simulation code, the choice of an appropriate discretization is crucial. Adaptive grids with cuboidal cells such as octrees have proven very popular, however several recently introduced hydrodynamical and RT codes are based on a Voronoi tessellation of the spatial domain. Such an unstructured grid poses new challenges in laying down the rays (straight paths) needed in RT codes. We show that it is straightf"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.1854","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:47:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TMgJlIJOO4UHcRHdtijQhQIf/U9V1b2UCrcoWq4hBWB0RgZjTM2V0aJeNtfCrpMzTDNDs+x0uWdqsiW87GYJCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-18T19:41:53.970053Z"},"content_sha256":"6725f343bfd1138d9511844343c6bc43beee53a1f7a7f1279d15d26ae8e27e3e","schema_version":"1.0","event_id":"sha256:6725f343bfd1138d9511844343c6bc43beee53a1f7a7f1279d15d26ae8e27e3e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2K3TKT3IPPKUIDLTOHYP3KI3NP/bundle.json","state_url":"https://pith.science/pith/2K3TKT3IPPKUIDLTOHYP3KI3NP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2K3TKT3IPPKUIDLTOHYP3KI3NP/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-18T19:41:53Z","links":{"resolver":"https://pith.science/pith/2K3TKT3IPPKUIDLTOHYP3KI3NP","bundle":"https://pith.science/pith/2K3TKT3IPPKUIDLTOHYP3KI3NP/bundle.json","state":"https://pith.science/pith/2K3TKT3IPPKUIDLTOHYP3KI3NP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2K3TKT3IPPKUIDLTOHYP3KI3NP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:2K3TKT3IPPKUIDLTOHYP3KI3NP","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"7a60e0d6b33cc313dc21a53aa451a6d79cc7e5ddcb44a18b6d1b7a5aedfe6c57","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-10-07T16:37:32Z","title_canon_sha256":"e3a9e2bab806690f1be7f9202c9f517cd79da41ae8be2cb2230be7f77c17962c"},"schema_version":"1.0","source":{"id":"1310.1854","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1310.1854","created_at":"2026-05-18T01:47:14Z"},{"alias_kind":"arxiv_version","alias_value":"1310.1854v1","created_at":"2026-05-18T01:47:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1310.1854","created_at":"2026-05-18T01:47:14Z"},{"alias_kind":"pith_short_12","alias_value":"2K3TKT3IPPKU","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_16","alias_value":"2K3TKT3IPPKUIDLT","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_8","alias_value":"2K3TKT3I","created_at":"2026-05-18T12:27:30Z"}],"graph_snapshots":[{"event_id":"sha256:6725f343bfd1138d9511844343c6bc43beee53a1f7a7f1279d15d26ae8e27e3e","target":"graph","created_at":"2026-05-18T01:47:14Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"Probing the structure of complex astrophysical objects requires effective three-dimensional (3D) numerical simulation of the relevant radiative transfer (RT) processes. As with any numerical simulation code, the choice of an appropriate discretization is crucial. Adaptive grids with cuboidal cells such as octrees have proven very popular, however several recently introduced hydrodynamical and RT codes are based on a Voronoi tessellation of the spatial domain. Such an unstructured grid poses new challenges in laying down the rays (straight paths) needed in RT codes. We show that it is straightf","authors_text":"Maarten Baes, Peter Camps, Waad Saftly","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-10-07T16:37:32Z","title":"Using 3D Voronoi grids in radiative transfer simulations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.1854","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:e555cf2ee5070dbcb5b677d54bc24cb4085a60301213de3d7cbdae0599d93c39","target":"record","created_at":"2026-05-18T01:47:14Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"7a60e0d6b33cc313dc21a53aa451a6d79cc7e5ddcb44a18b6d1b7a5aedfe6c57","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-10-07T16:37:32Z","title_canon_sha256":"e3a9e2bab806690f1be7f9202c9f517cd79da41ae8be2cb2230be7f77c17962c"},"schema_version":"1.0","source":{"id":"1310.1854","kind":"arxiv","version":1}},"canonical_sha256":"d2b7354f687bd5440d7371f0fda91b6bee7add3617763d1558aeba8740b9b05f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d2b7354f687bd5440d7371f0fda91b6bee7add3617763d1558aeba8740b9b05f","first_computed_at":"2026-05-18T01:47:14.372657Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:47:14.372657Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"AUOAhKhvoaZ1LOsN01TwQrmzw5q48W5koabPRMrnrajy9Tc9a1BtEMH5p1iMVRkEotfJNi54WgmAybysf+pEDw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:47:14.373379Z","signed_message":"canonical_sha256_bytes"},"source_id":"1310.1854","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e555cf2ee5070dbcb5b677d54bc24cb4085a60301213de3d7cbdae0599d93c39","sha256:6725f343bfd1138d9511844343c6bc43beee53a1f7a7f1279d15d26ae8e27e3e"],"state_sha256":"9e5d1d1587a30c1f14bf473168ab2220442b98068c587a933e3b6b3f10e8391b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yes7kMWa7rM/CbM7L/fncuoHc6p95lA/KrDEjdyhStilNd/7Ishj+8su0G5D2Pky9hedXyyomtV7kNrBpcVWCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-18T19:41:53.971447Z","bundle_sha256":"d5e9a0879943fc372fc0d5229564c31f0417a0cd99260b6ee5048953e3fd098f"}}