Bbtools-flver To Sdm- -

python flver2sdm.py dark_souls_sword.flver weapon.sdm | Problem | Likely Cause | Solution | |---------|--------------|----------| | SDM mesh is mirrored | FLVER uses right-handed Z-up; SDM uses left-handed Y-up | Swap Z and Y, flip triangle winding | | Missing bone weights | BBTools-flver export dropped skinning | Use --transform-bind-pose only for static export; for skinned, use JSON dump | | UVs are distorted | FLVER stores UV as 16-bit half-floats | Normalize to [0,1] range using bbtools-flver ’s --fix-uv flag | | LODs cause flickering | LOD ranges not set in SDM header | Manually set lod_distances array in custom header extension | Conclusion: From Proprietary to Portable Converting BBTools-flver to SDM- is not a one-click solution, but a controlled, multi-stage data transformation. By leveraging BBTools-flver for extraction, intermediate GLTF/PLY formats for fidelity, and a custom Python writer for SDM binary layout, you gain full control over the asset pipeline.

#!/usr/bin/env python3 """ FLVER to SDM- converter using BBTools-flver as a subprocess. """ import subprocess import json import numpy as np import struct import sys import tempfile import os Bbtools-flver To Sdm-

# Step 2: Extract vertex buffers with tempfile.TemporaryDirectory() as tmpdir: subprocess.run([ "bbtools-flver", "export", input_flver, "--format", "ply", "--output", os.path.join(tmpdir, "mesh.ply") ], check=True) # Load with trimesh import trimesh mesh = trimesh.load(os.path.join(tmpdir, "mesh.ply")) vertices = np.array(mesh.vertices, dtype=np.float32) normals = np.array(mesh.vertex_normals, dtype=np.float32) # UVs: mesh.visual.uv (may be None) uvs = getattr(mesh.visual, 'uv', np.zeros((len(vertices), 2), dtype=np.float32)) # Step 3: Build SDM buffer vertex_buffer = np.zeros(len(vertices), dtype=[ ('pos', 'f4', 3), ('norm', 'f4', 3), ('uv', 'f4', 2) ]) vertex_buffer['pos'] = vertices vertex_buffer['norm'] = normals vertex_buffer['uv'] = uvs # Step 4: Write SDM- with open(output_sdm, 'wb') as f: f.write(b'SDM-') f.write(struct.pack('<I', 1)) # version f.write(struct.pack('<I', len(vertices))) f.write(struct.pack('<I', len(mesh.faces) * 3)) f.write(vertex_buffer.tobytes()) indices = mesh.faces.flatten().astype(np.uint32) f.write(indices.tobytes()) python flver2sdm

Better: Use bbtools-flver ’s :

Extend the pipeline to support animation retargeting (FLVER’s HKX skeleton to SDM’s bone palette) — a topic for a future deep dive. Tools used: BBTools-flver v3.2, Python 3.10, trimesh 3.23, SDM specification draft 0.9. Feedback and pull requests welcome on the project repository. """ import subprocess import json import numpy as

def flver_to_sdm(input_flver, output_sdm, generate_lods=True): # Step 1: Dump JSON from BBTools-flver json_data = subprocess.check_output( ["bbtools-flver", "dump", input_flver, "--format", "json"] ) mesh_info = json.loads(json_data)

print(f"✅ Converted input_flver to output_sdm") if == " main ": flver_to_sdm(sys.argv[1], sys.argv[2])