482 lines
17 KiB
Python
482 lines
17 KiB
Python
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#!/usr/bin/env python3
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"""
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Primitive software renderer for NGI MSH models.
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Output format: binary PPM (P6), no external dependencies.
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"""
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from __future__ import annotations
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import argparse
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import math
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import struct
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from pathlib import Path
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from typing import Any
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import archive_roundtrip_validator as arv
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MAGIC_NRES = b"NRes"
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def _entry_payload(blob: bytes, entry: dict[str, Any]) -> bytes:
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start = int(entry["data_offset"])
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end = start + int(entry["size"])
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return blob[start:end]
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def _parse_nres(blob: bytes, source: str) -> dict[str, Any]:
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if blob[:4] != MAGIC_NRES:
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raise RuntimeError(f"{source}: not an NRes payload")
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return arv.parse_nres(blob, source=source)
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def _by_type(entries: list[dict[str, Any]]) -> dict[int, list[dict[str, Any]]]:
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out: dict[int, list[dict[str, Any]]] = {}
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for row in entries:
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out.setdefault(int(row["type_id"]), []).append(row)
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return out
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def _pick_model_payload(archive_path: Path, model_name: str | None) -> tuple[bytes, str]:
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root_blob = archive_path.read_bytes()
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parsed = _parse_nres(root_blob, str(archive_path))
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msh_entries = [row for row in parsed["entries"] if str(row["name"]).lower().endswith(".msh")]
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if msh_entries:
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chosen: dict[str, Any] | None = None
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if model_name:
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model_l = model_name.lower()
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for row in msh_entries:
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name_l = str(row["name"]).lower()
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if name_l == model_l:
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chosen = row
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break
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if chosen is None:
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for row in msh_entries:
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if str(row["name"]).lower().startswith(model_l):
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chosen = row
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break
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else:
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chosen = msh_entries[0]
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if chosen is None:
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names = ", ".join(str(row["name"]) for row in msh_entries[:12])
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raise RuntimeError(
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f"model '{model_name}' not found in {archive_path}. Available: {names}"
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)
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return _entry_payload(root_blob, chosen), str(chosen["name"])
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# Fallback: treat file itself as a model NRes payload.
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by_type = _by_type(parsed["entries"])
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if all(k in by_type for k in (1, 2, 3, 6, 13)):
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return root_blob, archive_path.name
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raise RuntimeError(
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f"{archive_path} does not contain .msh entries and does not look like a direct model payload"
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)
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def _get_single(by_type: dict[int, list[dict[str, Any]]], type_id: int, label: str) -> dict[str, Any]:
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rows = by_type.get(type_id, [])
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if not rows:
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raise RuntimeError(f"missing resource type {type_id} ({label})")
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return rows[0]
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def _extract_geometry(
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model_blob: bytes,
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*,
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lod: int,
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group: int,
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max_faces: int,
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) -> tuple[list[tuple[float, float, float]], list[tuple[int, int, int]], dict[str, int]]:
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parsed = _parse_nres(model_blob, "<model>")
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by_type = _by_type(parsed["entries"])
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res1 = _get_single(by_type, 1, "Res1")
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res2 = _get_single(by_type, 2, "Res2")
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res3 = _get_single(by_type, 3, "Res3")
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res6 = _get_single(by_type, 6, "Res6")
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res13 = _get_single(by_type, 13, "Res13")
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# Positions
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pos_blob = _entry_payload(model_blob, res3)
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if len(pos_blob) % 12 != 0:
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raise RuntimeError(f"Res3 size is not divisible by 12: {len(pos_blob)}")
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vertex_count = len(pos_blob) // 12
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positions = [struct.unpack_from("<3f", pos_blob, i * 12) for i in range(vertex_count)]
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# Indices
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idx_blob = _entry_payload(model_blob, res6)
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if len(idx_blob) % 2 != 0:
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raise RuntimeError(f"Res6 size is not divisible by 2: {len(idx_blob)}")
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index_count = len(idx_blob) // 2
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indices = list(struct.unpack_from(f"<{index_count}H", idx_blob, 0))
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# Batches
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batch_blob = _entry_payload(model_blob, res13)
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if len(batch_blob) % 20 != 0:
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raise RuntimeError(f"Res13 size is not divisible by 20: {len(batch_blob)}")
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batch_count = len(batch_blob) // 20
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batches: list[tuple[int, int, int, int]] = []
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for i in range(batch_count):
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off = i * 20
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# Keep only fields used by renderer:
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# indexCount, indexStart, baseVertex
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idx_count = struct.unpack_from("<H", batch_blob, off + 8)[0]
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idx_start = struct.unpack_from("<I", batch_blob, off + 10)[0]
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base_vertex = struct.unpack_from("<I", batch_blob, off + 16)[0]
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batches.append((idx_count, idx_start, base_vertex, i))
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# Slots
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res2_blob = _entry_payload(model_blob, res2)
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if len(res2_blob) < 0x8C:
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raise RuntimeError("Res2 is too small (< 0x8C)")
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slot_blob = res2_blob[0x8C:]
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if len(slot_blob) % 68 != 0:
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raise RuntimeError(f"Res2 slot area is not divisible by 68: {len(slot_blob)}")
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slot_count = len(slot_blob) // 68
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slots: list[tuple[int, int, int, int]] = []
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for i in range(slot_count):
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off = i * 68
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tri_start, tri_count, batch_start, slot_batch_count = struct.unpack_from("<4H", slot_blob, off)
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slots.append((tri_start, tri_count, batch_start, slot_batch_count))
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# Nodes / slot matrix
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res1_blob = _entry_payload(model_blob, res1)
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node_stride = int(res1["attr3"])
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node_count = int(res1["attr1"])
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node_slot_indices: list[int] = []
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if node_stride >= 38 and len(res1_blob) >= node_count * node_stride:
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if lod < 0 or lod > 2:
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raise RuntimeError(f"lod must be 0..2 (got {lod})")
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if group < 0 or group > 4:
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raise RuntimeError(f"group must be 0..4 (got {group})")
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matrix_index = lod * 5 + group
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for n in range(node_count):
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off = n * node_stride + 8 + matrix_index * 2
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slot_idx = struct.unpack_from("<H", res1_blob, off)[0]
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if slot_idx == 0xFFFF:
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continue
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if slot_idx >= slot_count:
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continue
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node_slot_indices.append(slot_idx)
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# Build triangle list.
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faces: list[tuple[int, int, int]] = []
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used_batches = 0
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used_slots = 0
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def append_batch(batch_idx: int) -> None:
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nonlocal used_batches
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if batch_idx < 0 or batch_idx >= len(batches):
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return
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idx_count, idx_start, base_vertex, _ = batches[batch_idx]
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if idx_count < 3:
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return
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end = idx_start + idx_count
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if end > len(indices):
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return
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used_batches += 1
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tri_count = idx_count // 3
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for t in range(tri_count):
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i0 = indices[idx_start + t * 3 + 0] + base_vertex
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i1 = indices[idx_start + t * 3 + 1] + base_vertex
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i2 = indices[idx_start + t * 3 + 2] + base_vertex
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if i0 >= vertex_count or i1 >= vertex_count or i2 >= vertex_count:
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continue
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faces.append((i0, i1, i2))
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if len(faces) >= max_faces:
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return
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if node_slot_indices:
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for slot_idx in node_slot_indices:
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if len(faces) >= max_faces:
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break
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_tri_start, _tri_count, batch_start, slot_batch_count = slots[slot_idx]
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used_slots += 1
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for bi in range(batch_start, batch_start + slot_batch_count):
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append_batch(bi)
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if len(faces) >= max_faces:
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break
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else:
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# Fallback if slot matrix is unavailable: draw all batches.
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for bi in range(batch_count):
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append_batch(bi)
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if len(faces) >= max_faces:
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break
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meta = {
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"vertex_count": vertex_count,
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"index_count": index_count,
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"batch_count": batch_count,
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"slot_count": slot_count,
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"node_count": node_count,
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"used_slots": used_slots,
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"used_batches": used_batches,
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"face_count": len(faces),
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}
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if not faces:
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raise RuntimeError("no faces selected for rendering")
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return positions, faces, meta
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def _write_ppm(path: Path, width: int, height: int, rgb: bytearray) -> None:
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path.parent.mkdir(parents=True, exist_ok=True)
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with path.open("wb") as handle:
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handle.write(f"P6\n{width} {height}\n255\n".encode("ascii"))
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handle.write(rgb)
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def _render_software(
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positions: list[tuple[float, float, float]],
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faces: list[tuple[int, int, int]],
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*,
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width: int,
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height: int,
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yaw_deg: float,
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pitch_deg: float,
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wireframe: bool,
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) -> bytearray:
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xs = [p[0] for p in positions]
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ys = [p[1] for p in positions]
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zs = [p[2] for p in positions]
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cx = (min(xs) + max(xs)) * 0.5
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cy = (min(ys) + max(ys)) * 0.5
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cz = (min(zs) + max(zs)) * 0.5
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span = max(max(xs) - min(xs), max(ys) - min(ys), max(zs) - min(zs))
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radius = max(span * 0.5, 1e-3)
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yaw = math.radians(yaw_deg)
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pitch = math.radians(pitch_deg)
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cyaw = math.cos(yaw)
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syaw = math.sin(yaw)
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cpitch = math.cos(pitch)
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spitch = math.sin(pitch)
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camera_dist = radius * 3.2
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scale = min(width, height) * 0.95
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# Transform all vertices once.
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vx: list[float] = []
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vy: list[float] = []
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vz: list[float] = []
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sx: list[float] = []
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sy: list[float] = []
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for x, y, z in positions:
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x0 = x - cx
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y0 = y - cy
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z0 = z - cz
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x1 = cyaw * x0 + syaw * z0
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z1 = -syaw * x0 + cyaw * z0
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y2 = cpitch * y0 - spitch * z1
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z2 = spitch * y0 + cpitch * z1 + camera_dist
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if z2 < 1e-3:
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z2 = 1e-3
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vx.append(x1)
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vy.append(y2)
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vz.append(z2)
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sx.append(width * 0.5 + (x1 / z2) * scale)
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sy.append(height * 0.5 - (y2 / z2) * scale)
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rgb = bytearray([16, 18, 24] * (width * height))
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zbuf = [float("inf")] * (width * height)
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light_dir = (0.35, 0.45, 1.0)
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l_len = math.sqrt(light_dir[0] ** 2 + light_dir[1] ** 2 + light_dir[2] ** 2)
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light = (light_dir[0] / l_len, light_dir[1] / l_len, light_dir[2] / l_len)
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def edge(ax: float, ay: float, bx: float, by: float, px: float, py: float) -> float:
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return (px - ax) * (by - ay) - (py - ay) * (bx - ax)
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for i0, i1, i2 in faces:
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x0 = sx[i0]
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y0 = sy[i0]
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x1 = sx[i1]
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y1 = sy[i1]
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x2 = sx[i2]
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y2 = sy[i2]
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area = edge(x0, y0, x1, y1, x2, y2)
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if area == 0.0:
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continue
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# Shading from camera-space normal.
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ux = vx[i1] - vx[i0]
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uy = vy[i1] - vy[i0]
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uz = vz[i1] - vz[i0]
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wx = vx[i2] - vx[i0]
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wy = vy[i2] - vy[i0]
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wz = vz[i2] - vz[i0]
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nx = uy * wz - uz * wy
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ny = uz * wx - ux * wz
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nz = ux * wy - uy * wx
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n_len = math.sqrt(nx * nx + ny * ny + nz * nz)
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if n_len > 0.0:
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nx /= n_len
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ny /= n_len
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nz /= n_len
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intensity = nx * light[0] + ny * light[1] + nz * light[2]
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if intensity < 0.0:
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intensity = 0.0
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shade = int(45 + 200 * intensity)
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color = (shade, shade, min(255, shade + 18))
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minx = int(max(0, math.floor(min(x0, x1, x2))))
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maxx = int(min(width - 1, math.ceil(max(x0, x1, x2))))
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miny = int(max(0, math.floor(min(y0, y1, y2))))
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maxy = int(min(height - 1, math.ceil(max(y0, y1, y2))))
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if minx > maxx or miny > maxy:
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continue
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z0 = vz[i0]
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z1 = vz[i1]
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z2 = vz[i2]
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for py in range(miny, maxy + 1):
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fy = py + 0.5
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row = py * width
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for px in range(minx, maxx + 1):
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fx = px + 0.5
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w0 = edge(x1, y1, x2, y2, fx, fy)
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w1 = edge(x2, y2, x0, y0, fx, fy)
|
||
|
|
w2 = edge(x0, y0, x1, y1, fx, fy)
|
||
|
|
if area > 0:
|
||
|
|
if w0 < 0 or w1 < 0 or w2 < 0:
|
||
|
|
continue
|
||
|
|
else:
|
||
|
|
if w0 > 0 or w1 > 0 or w2 > 0:
|
||
|
|
continue
|
||
|
|
inv_area = 1.0 / area
|
||
|
|
bz0 = w0 * inv_area
|
||
|
|
bz1 = w1 * inv_area
|
||
|
|
bz2 = w2 * inv_area
|
||
|
|
depth = bz0 * z0 + bz1 * z1 + bz2 * z2
|
||
|
|
idx = row + px
|
||
|
|
if depth >= zbuf[idx]:
|
||
|
|
continue
|
||
|
|
zbuf[idx] = depth
|
||
|
|
p = idx * 3
|
||
|
|
rgb[p + 0] = color[0]
|
||
|
|
rgb[p + 1] = color[1]
|
||
|
|
rgb[p + 2] = color[2]
|
||
|
|
|
||
|
|
if wireframe:
|
||
|
|
def draw_line(xa: float, ya: float, xb: float, yb: float) -> None:
|
||
|
|
x0i = int(round(xa))
|
||
|
|
y0i = int(round(ya))
|
||
|
|
x1i = int(round(xb))
|
||
|
|
y1i = int(round(yb))
|
||
|
|
dx = abs(x1i - x0i)
|
||
|
|
sx_step = 1 if x0i < x1i else -1
|
||
|
|
dy = -abs(y1i - y0i)
|
||
|
|
sy_step = 1 if y0i < y1i else -1
|
||
|
|
err = dx + dy
|
||
|
|
x = x0i
|
||
|
|
y = y0i
|
||
|
|
while True:
|
||
|
|
if 0 <= x < width and 0 <= y < height:
|
||
|
|
p = (y * width + x) * 3
|
||
|
|
rgb[p + 0] = 240
|
||
|
|
rgb[p + 1] = 245
|
||
|
|
rgb[p + 2] = 255
|
||
|
|
if x == x1i and y == y1i:
|
||
|
|
break
|
||
|
|
e2 = 2 * err
|
||
|
|
if e2 >= dy:
|
||
|
|
err += dy
|
||
|
|
x += sx_step
|
||
|
|
if e2 <= dx:
|
||
|
|
err += dx
|
||
|
|
y += sy_step
|
||
|
|
|
||
|
|
for i0, i1, i2 in faces:
|
||
|
|
draw_line(sx[i0], sy[i0], sx[i1], sy[i1])
|
||
|
|
draw_line(sx[i1], sy[i1], sx[i2], sy[i2])
|
||
|
|
draw_line(sx[i2], sy[i2], sx[i0], sy[i0])
|
||
|
|
|
||
|
|
return rgb
|
||
|
|
|
||
|
|
|
||
|
|
def cmd_list_models(args: argparse.Namespace) -> int:
|
||
|
|
archive_path = Path(args.archive).resolve()
|
||
|
|
blob = archive_path.read_bytes()
|
||
|
|
parsed = _parse_nres(blob, str(archive_path))
|
||
|
|
rows = [row for row in parsed["entries"] if str(row["name"]).lower().endswith(".msh")]
|
||
|
|
print(f"Archive: {archive_path}")
|
||
|
|
print(f"MSH entries: {len(rows)}")
|
||
|
|
for row in rows:
|
||
|
|
print(f"- {row['name']}")
|
||
|
|
return 0
|
||
|
|
|
||
|
|
|
||
|
|
def cmd_render(args: argparse.Namespace) -> int:
|
||
|
|
archive_path = Path(args.archive).resolve()
|
||
|
|
output_path = Path(args.output).resolve()
|
||
|
|
|
||
|
|
model_blob, model_label = _pick_model_payload(archive_path, args.model)
|
||
|
|
positions, faces, meta = _extract_geometry(
|
||
|
|
model_blob,
|
||
|
|
lod=int(args.lod),
|
||
|
|
group=int(args.group),
|
||
|
|
max_faces=int(args.max_faces),
|
||
|
|
)
|
||
|
|
rgb = _render_software(
|
||
|
|
positions,
|
||
|
|
faces,
|
||
|
|
width=int(args.width),
|
||
|
|
height=int(args.height),
|
||
|
|
yaw_deg=float(args.yaw),
|
||
|
|
pitch_deg=float(args.pitch),
|
||
|
|
wireframe=bool(args.wireframe),
|
||
|
|
)
|
||
|
|
_write_ppm(output_path, int(args.width), int(args.height), rgb)
|
||
|
|
|
||
|
|
print(f"Rendered model: {model_label}")
|
||
|
|
print(f"Output : {output_path}")
|
||
|
|
print(
|
||
|
|
"Geometry : "
|
||
|
|
f"vertices={meta['vertex_count']}, faces={meta['face_count']}, "
|
||
|
|
f"batches={meta['used_batches']}/{meta['batch_count']}, slots={meta['used_slots']}/{meta['slot_count']}"
|
||
|
|
)
|
||
|
|
print(f"Mode : lod={args.lod}, group={args.group}, wireframe={bool(args.wireframe)}")
|
||
|
|
return 0
|
||
|
|
|
||
|
|
|
||
|
|
def build_parser() -> argparse.ArgumentParser:
|
||
|
|
parser = argparse.ArgumentParser(
|
||
|
|
description="Primitive NGI MSH renderer (software, dependency-free)."
|
||
|
|
)
|
||
|
|
sub = parser.add_subparsers(dest="command", required=True)
|
||
|
|
|
||
|
|
list_models = sub.add_parser("list-models", help="List .msh entries in an NRes archive.")
|
||
|
|
list_models.add_argument("--archive", required=True, help="Path to archive (e.g. animals.rlb).")
|
||
|
|
list_models.set_defaults(func=cmd_list_models)
|
||
|
|
|
||
|
|
render = sub.add_parser("render", help="Render one model to PPM image.")
|
||
|
|
render.add_argument("--archive", required=True, help="Path to NRes archive or direct model payload.")
|
||
|
|
render.add_argument(
|
||
|
|
"--model",
|
||
|
|
help="Model entry name (*.msh) inside archive. If omitted, first .msh is used.",
|
||
|
|
)
|
||
|
|
render.add_argument("--output", required=True, help="Output .ppm file path.")
|
||
|
|
render.add_argument("--lod", type=int, default=0, help="LOD index 0..2 (default: 0).")
|
||
|
|
render.add_argument("--group", type=int, default=0, help="Group index 0..4 (default: 0).")
|
||
|
|
render.add_argument("--max-faces", type=int, default=120000, help="Face limit (default: 120000).")
|
||
|
|
render.add_argument("--width", type=int, default=1280, help="Image width (default: 1280).")
|
||
|
|
render.add_argument("--height", type=int, default=720, help="Image height (default: 720).")
|
||
|
|
render.add_argument("--yaw", type=float, default=35.0, help="Yaw angle in degrees (default: 35).")
|
||
|
|
render.add_argument("--pitch", type=float, default=18.0, help="Pitch angle in degrees (default: 18).")
|
||
|
|
render.add_argument("--wireframe", action="store_true", help="Draw white wireframe overlay.")
|
||
|
|
render.set_defaults(func=cmd_render)
|
||
|
|
|
||
|
|
return parser
|
||
|
|
|
||
|
|
|
||
|
|
def main() -> int:
|
||
|
|
parser = build_parser()
|
||
|
|
args = parser.parse_args()
|
||
|
|
return int(args.func(args))
|
||
|
|
|
||
|
|
|
||
|
|
if __name__ == "__main__":
|
||
|
|
raise SystemExit(main())
|