numpy
Pillow
In the world of 3D modding for classic games like Grand Theft Auto: San Andreas, Vice City, or Manhunt, the DFF (RenderWare Binary Stream File) format is king. However, most modern 3D models are created or downloaded in the OBJ (Wavefront Object) format.
The phrase "convert obj to dff exclusive" has become a gold-standard search query among advanced modders. Why "exclusive"? Because standard conversions often result in corrupted textures, broken hierarchies, missing normals, or collapsed vertices. An exclusive conversion means:
This article provides a step-by-step, fail-safe methodology to perform an exclusive OBJ → DFF conversion using professional tools and insider techniques. convert obj to dff exclusive
Due to the complexity of the DFF format, direct "drag-and-drop" converters often fail to produce game-ready files. The industry-standard "exclusive" workflow uses Autodesk 3ds Max with the KAMS/GTA scripts.
import struct import numpy as npclass DFFExclusiveBuilder: def init(self, name="object"): self.name = name self.geometries = [] # list of (verts, tris, uvs, normals, material_index) self.materials = [] # list of material names numpy Pillow
def add_geometry(self, vertices, triangles, uvs, normals, material_name): self.geometries.append( 'verts': vertices, 'tris': triangles, 'uvs': uvs, 'normals': normals, 'material': material_name ) if material_name not in self.materials: self.materials.append(material_name) def build(self): # Minimal valid DFF structure for GTA SA (exclusive mode) data = bytearray() # RW version chunk data.extend(struct.pack('<III', 0x10F, 0x04, 0x1803FFFF)) # Section, size, version # Clump start data.extend(struct.pack('<III', 0x10F, 0x04, 0x1803FFFF)) # Frame list frame_count = 1 data.extend(struct.pack('<III', 0x253F2FE, 12 + frame_count*28, 0x1803FFFF)) data.extend(struct.pack('<I', frame_count)) # Identity matrix + position for _ in range(frame_count): data.extend(struct.pack('<ffffffffffff', 1,0,0,0, 0,1,0,0, 0,0,1,0)) # 3x4 matrix data.extend(struct.pack('<fff', 0,0,0)) # position # Geometry list for geo in self.geometries: # Atomic section data.extend(struct.pack('<III', 0x253F2F2, 12, 0x1803FFFF)) data.extend(struct.pack('<I', 0)) # frame index # Geometry struct verts = np.array(geo['verts'], dtype=np.float32) tris = np.array(geo['tris'], dtype=np.uint16) uvs = np.array(geo['uvs'], dtype=np.float32) normals = np.array(geo['normals'], dtype=np.float32) flags = 0x01 # has vertices if len(uvs) > 0: flags |= 0x08 # has UVs if len(normals) > 0: flags |= 0x10 # has normals geom_size = 36 + len(verts)*12 + len(tris)*6 + len(uvs)*8 + len(normals)*12 data.extend(struct.pack('<III', 0x253F2F1, geom_size, 0x1803FFFF)) data.extend(struct.pack('<II', len(verts), len(tris))) data.extend(struct.pack('<I', flags)) # Vertices for v in verts: data.extend(struct.pack('<fff', v[0], v[1], v[2])) # Triangles for t in tris: data.extend(struct.pack('<HHH', t[0], t[1], t[2])) # UVs for uv in uvs: data.extend(struct.pack('<ff', uv[0], uv[1])) # Normals for n in normals: data.extend(struct.pack('<fff', n[0], n[1], n[2])) return bytes(data)
import os import numpy as np from rw_dff_builder import DFFExclusiveBuilderdef load_obj(filepath): vertices = [] uvs = [] normals = [] faces = [] materials = {} current_material = None
with open(filepath, 'r') as f: for line in f: if line.startswith('v '): parts = line.split() vertices.append([float(parts[1]), float(parts[2]), float(parts[3])]) elif line.startswith('vt '): parts = line.split() uvs.append([float(parts[1]), float(parts[2]) if len(parts)>2 else 0.0]) elif line.startswith('vn '): parts = line.split() normals.append([float(parts[1]), float(parts[2]), float(parts[3])]) elif line.startswith('f '): parts = line.split()[1:] face_verts = [] face_uvs = [] face_norms = [] for part in parts: indices = part.split('/') v_idx = int(indices[0]) - 1 vt_idx = int(indices[1]) - 1 if len(indices) > 1 and indices[1] else -1 vn_idx = int(indices[2]) - 1 if len(indices) > 2 and indices[2] else -1 face_verts.append(v_idx) face_uvs.append(vt_idx if vt_idx != -1 else None) face_norms.append(vn_idx if vn_idx != -1 else None) faces.append((face_verts, face_uvs, face_norms, current_material)) elif line.startswith('usemtl '): current_material = line.split()[1] return vertices, uvs, normals, faces, materialsdef convert_obj_to_dff(obj_path, dff_path): verts, uvs, norms, faces, _ = load_obj(obj_path) In the world of 3D modding for classic
builder = DFFExclusiveBuilder(name=os.path.basename(obj_path).replace('.obj', '')) # Convert to flat arrays per material material_groups = {} for fv, fuv, fn, mat in faces: if mat not in material_groups: material_groups[mat] = 'verts': [], 'uvs': [], 'normals': [], 'tris': [] # Triangulate quad if needed (simplified: assume triangles) for i in range(1, len(fv)-1): tri_verts = [fv[0], fv[i], fv[i+1]] tri_uvs = [fuv[0] if fuv[0] is not None else -1, fuv[i] if fuv[i] is not None else -1, fuv[i+1] if fuv[i+1] is not None else -1] tri_norms = [fn[0] if fn[0] is not None else -1, fn[i] if fn[i] is not None else -1, fn[i+1] if fn[i+1] is not None else -1] idx_start = len(material_groups[mat]['verts']) for v_idx in tri_verts: material_groups[mat]['verts'].append(verts[v_idx]) for uv_idx in tri_uvs: if uv_idx != -1 and uv_idx < len(uvs): material_groups[mat]['uvs'].append(uvs[uv_idx]) else: material_groups[mat]['uvs'].append([0.0, 0.0]) for n_idx in tri_norms: if n_idx != -1 and n_idx < len(norms): material_groups[mat]['normals'].append(norms[n_idx]) else: material_groups[mat]['normals'].append([0,1,0]) material_groups[mat]['tris'].append([idx_start, idx_start+1, idx_start+2]) for mat_name, data in material_groups.items(): builder.add_geometry( vertices=data['verts'], triangles=data['tris'], uvs=data['uvs'], normals=data['normals'], material_name=mat_name or 'default' ) dff_data = builder.build() with open(dff_path, 'wb') as f: f.write(dff_data) print(f"✅ Exported exclusive DFF to dff_path")