blender-web-pipeline

# Blender Python Console or script
 
import bpy
 
# Select objects to export (optional - exports all if none selected)
bpy.ops.object.select_all(action='DESELECT')
bpy.data.objects['MyModel'].select_set(True)
 
# Export as GLB
bpy.ops.export_scene.gltf(
    filepath='/path/to/output.glb',
    export_format='GLB',                # Binary format
    use_selection=True,                 # Export selected only
    export_apply=True,                  # Apply modifiers
    export_texcoords=True,              # UV coordinates
    export_normals=True,                # Normals
    export_materials='EXPORT',          # Export materials
    export_colors=True,                 # Vertex colors
    export_cameras=False,               # Skip cameras
    export_lights=False,                # Skip lights
    export_animations=True,             # Include animations
    export_draco_mesh_compression_enable=True,  # Compress geometry
    export_draco_mesh_compression_level=6,      # 0-10 (6 recommended)
    export_draco_position_quantization=14,      # 8-14 bits
    export_draco_normal_quantization=10,        # 8-10 bits
    export_draco_texcoord_quantization=12       # 8-12 bits
)

#!/usr/bin/env blender --background --python
"""
Batch export all .blend files in a directory to glTF
Usage: blender --background --python batch_export.py -- /path/to/blend/files
"""
 
import bpy
import os
import sys
 
# Get command line arguments after --
argv = sys.argv
argv = argv[argv.index("--") + 1:] if "--" in argv else []
 
input_dir = argv[0] if argv else "/path/to/models"
output_dir = argv[1] if len(argv) > 1 else input_dir + "_gltf"
 
# Create output directory
os.makedirs(output_dir, exist_ok=True)
 
# Find all .blend files
blend_files = [f for f in os.listdir(input_dir) if f.endswith('.blend')]
 
print(f"Found {len(blend_files)} .blend files")
 
for blend_file in blend_files:
    input_path = os.path.join(input_dir, blend_file)
    output_name = blend_file.replace('.blend', '.glb')
    output_path = os.path.join(output_dir, output_name)
 
    print(f"Processing: {blend_file}")
 
    # Open blend file
    bpy.ops.wm.open_mainfile(filepath=input_path)
 
    # Export as GLB with optimizations
    bpy.ops.export_scene.gltf(
        filepath=output_path,
        export_format='GLB',
        export_apply=True,
        export_draco_mesh_compression_enable=True,
        export_draco_mesh_compression_level=6
    )
 
    print(f"  Exported: {output_name}")
 
print("Batch export complete!")

blender --background --python batch_export.py -- /models/source /models/output

import bpy
 
def optimize_mesh(obj, target_ratio=0.5):
    """Reduce polygon count using decimation modifier."""
 
    if obj.type != 'MESH':
        return
 
    # Add Decimate modifier
    decimate = obj.modifiers.new(name='Decimate', type='DECIMATE')
    decimate.ratio = target_ratio  # 0.5 = 50% of original polygons
    decimate.use_collapse_triangulate = True
 
    # Apply modifier
    bpy.context.view_layer.objects.active = obj
    bpy.ops.object.modifier_apply(modifier='Decimate')
 
    print(f"Optimized {obj.name}: {len(obj.data.polygons)} polygons")
 
# Optimize all selected meshes
for obj in bpy.context.selected_objects:
    optimize_mesh(obj, target_ratio=0.3)

import bpy
 
def bake_textures(obj, resolution=1024):
    """Bake all materials to single texture."""
 
    # Setup bake settings
    bpy.context.scene.render.engine = 'CYCLES'
    bpy.context.scene.cycles.bake_type = 'COMBINED'
 
    # Create bake image
    bake_image = bpy.data.images.new(
        name=f"{obj.name}_bake",
        width=resolution,
        height=resolution
    )
 
    # Create bake material
    mat = bpy.data.materials.new(name=f"{obj.name}_baked")
    mat.use_nodes = True
    nodes = mat.node_tree.nodes
 
    # Add Image Texture node
    tex_node = nodes.new(type='ShaderNodeTexImage')
    tex_node.image = bake_image
    tex_node.select = True
    nodes.active = tex_node
 
    # Assign material
    if obj.data.materials:
        obj.data.materials[0] = mat
    else:
        obj.data.materials.append(mat)
 
    # Select object
    bpy.context.view_layer.objects.active = obj
    obj.select_set(True)
 
    # Bake
    bpy.ops.object.bake(type='COMBINED')
 
    # Save baked texture
    bake_image.filepath_raw = f"/tmp/{obj.name}_bake.png"
    bake_image.file_format = 'PNG'
    bake_image.save()
 
    print(f"Baked {obj.name} to {bake_image.filepath_raw}")
 
# Bake selected objects
for obj in bpy.context.selected_objects:
    if obj.type == 'MESH':
        bake_textures(obj, resolution=2048)

import bpy
 
def generate_lods(obj, lod_levels=[0.75, 0.5, 0.25]):
    """Generate LOD copies with decreasing polygon counts."""
 
    lod_objects = []
 
    for i, ratio in enumerate(lod_levels):
        # Duplicate object
        lod_obj = obj.copy()
        lod_obj.data = obj.data.copy()
        lod_obj.name = f"{obj.name}_LOD{i}"
 
        # Link to scene
        bpy.context.collection.objects.link(lod_obj)
 
        # Add Decimate modifier
        decimate = lod_obj.modifiers.new(name='Decimate', type='DECIMATE')
        decimate.ratio = ratio
 
        # Apply modifier
        bpy.context.view_layer.objects.active = lod_obj
        bpy.ops.object.modifier_apply(modifier='Decimate')
 
        lod_objects.append(lod_obj)
 
        print(f"Created {lod_obj.name}: {len(lod_obj.data.polygons)} polygons")
 
    return lod_objects
 
# Generate LODs for selected object
if bpy.context.active_object:
    generate_lods(bpy.context.active_object)

import bpy
import os
 
def export_optimized_gltf(filepath, texture_max_size=1024):
    """Export glTF with downscaled textures."""
 
    # Downscale all textures
    for img in bpy.data.images:
        if img.size[0] > texture_max_size or img.size[1] > texture_max_size:
            img.scale(texture_max_size, texture_max_size)
            print(f"Downscaled {img.name} to {texture_max_size}x{texture_max_size}")
 
    # Export with Draco compression
    bpy.ops.export_scene.gltf(
        filepath=filepath,
        export_format='GLB',
        export_apply=True,
        export_image_format='JPEG',  # JPEG for smaller size (or PNG for quality)
        export_jpeg_quality=85,       # 0-100
        export_draco_mesh_compression_enable=True,
        export_draco_mesh_compression_level=8,  # Max compression
        export_draco_position_quantization=12,
        export_draco_normal_quantization=8,
        export_draco_texcoord_quantization=10
    )
 
# Export optimized
export_optimized_gltf('/path/to/optimized.glb', texture_max_size=512)

#!/bin/bash
# Batch export Blender files to glTF without opening GUI
 
SCRIPT_DIR="$(dirname "$0")"
 
# Export all .blend files in current directory
for blend_file in *.blend; do
    echo "Exporting $blend_file..."
 
    blender --background "$blend_file" --python - <<EOF
import bpy
import os
 
# Get output filename
filename = os.path.splitext(bpy.data.filepath)[0]
output = filename + '.glb'
 
# Export
bpy.ops.export_scene.gltf(
    filepath=output,
    export_format='GLB',
    export_apply=True,
    export_draco_mesh_compression_enable=True,
    export_draco_mesh_compression_level=6
)
 
print(f'Exported to {output}')
EOF
 
done
 
echo "All files exported!"

import * as THREE from 'three';
import { GLTFLoader } from 'three/addons/loaders/GLTFLoader.js';
import { DRACOLoader } from 'three/addons/loaders/DRACOLoader.js';
 
const loader = new GLTFLoader();
 
// Setup Draco decoder for compressed models
const dracoLoader = new DRACOLoader();
dracoLoader.setDecoderPath('/draco/');
loader.setDRACOLoader(dracoLoader);
 
// Load Blender export
loader.load('/models/exported.glb', (gltf) => {
  scene.add(gltf.scene);
 
  // Play animations
  if (gltf.animations.length > 0) {
    const mixer = new THREE.AnimationMixer(gltf.scene);
    const action = mixer.clipAction(gltf.animations[0]);
    action.play();
  }
});

import { useGLTF } from '@react-three/drei';
 
function Model() {
  const { scene } = useGLTF('/models/exported.glb');
  return <primitive object={scene} />;
}
 
// Preload for better performance
useGLTF.preload('/models/exported.glb');

import * as BABYLON from '@babylonjs/core';
import '@babylonjs/loaders/glTF';
 
BABYLON.SceneLoader.ImportMesh(
  '',
  '/models/',
  'exported.glb',
  scene,
  (meshes) => {
    console.log('Loaded meshes:', meshes);
  }
);

# Reduce polygon count by 70%
obj.modifiers.new(name='Decimate', type='DECIMATE')
obj.modifiers['Decimate'].ratio = 0.3

# Remove duplicate vertices
bpy.ops.object.mode_set(mode='EDIT')
bpy.ops.mesh.select_all(action='SELECT')
bpy.ops.mesh.remove_doubles(threshold=0.0001)
bpy.ops.object.mode_set(mode='OBJECT')

# Ensure all faces are triangles (required for some engines)
bpy.ops.object.mode_set(mode='EDIT')
bpy.ops.mesh.select_all(action='SELECT')
bpy.ops.mesh.quads_convert_to_tris()
bpy.ops.object.mode_set(mode='OBJECT')

# Save textures as JPEG (lossy but smaller)
for img in bpy.data.images:
    img.file_format = 'JPEG'
    img.filepath_raw = f"/output/{img.name}.jpg"
    img.save()

# Combine multiple textures into one atlas
# Use Smart UV Project for automatic atlasing
bpy.ops.object.mode_set(mode='EDIT')
bpy.ops.mesh.select_all(action='SELECT')
bpy.ops.uv.smart_project(angle_limit=66, island_margin=0.02)
bpy.ops.object.mode_set(mode='OBJECT')

# Ensure materials use Principled BSDF (glTF standard)
for mat in bpy.data.materials:
    if not mat.use_nodes:
        mat.use_nodes = True
 
    nodes = mat.node_tree.nodes
    principled = nodes.get('Principled BSDF')
 
    if not principled:
        principled = nodes.new(type='ShaderNodeBsdfPrincipled')
        output = nodes.get('Material Output')
        mat.node_tree.links.new(principled.outputs[0], output.inputs[0])

☐ Apply all modifiers
☐ Merge vertices (remove doubles)
☐ Triangulate faces (if required)
☐ Optimize polygon count (<50k triangles)
☐ UV unwrap all meshes
☐ Bake materials (if complex)
☐ Resize textures (max 2048x2048)
☐ Use Principled BSDF materials
☐ Remove unused data (orphan cleanup)
☐ Name objects descriptively
☐ Set origin points correctly
☐ Apply transformations (Ctrl+A)

# Recommended glTF export settings
bpy.ops.export_scene.gltf(
    filepath='/output.glb',
    export_format='GLB',                # Binary format
    export_apply=True,                  # Apply modifiers
    export_image_format='JPEG',         # Smaller file size
    export_jpeg_quality=85,             # Quality vs size
    export_draco_mesh_compression_enable=True,  # Enable compression
    export_draco_mesh_compression_level=6,      # Balance speed/size
    export_animations=True,             # Include animations
    export_lights=False,                # Skip lights (recreate in code)
    export_cameras=False                # Skip cameras
)