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glb_to_ply.py

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+# Blender Script that takes a folder of GLB files and processes them into PLY files
+# strips textures and vertex colors leaving only vertex pos, vertex norm, index buffer
+# 1. merges model into one contiguous mesh
+# 2. scales the model to a unit sphere
+# 3. centers the origin
+# 4. centers the model
+import bpy
+import glob
+import os
+from os import mkdir
+from os.path import isdir
+import pathlib
+
+# ---
+
+importDir = "GLB/"
+outputDir = "PLY0/"
+if not isdir(outputDir): mkdir(outputDir)
+#
+for file in glob.glob(importDir + "*.glb"):
+    model_name = pathlib.Path(file).stem
+    if pathlib.Path(outputDir+model_name+'.ply').is_file() == True: continue
+    try:
+        bpy.ops.import_scene.gltf(filepath=file)
+    except:
+        continue
+    bpy.ops.wm.ply_export(
+                            filepath=outputDir+model_name+'.ply',
+                            filter_glob='*.ply',
+                            check_existing=False,
+                            ascii_format=False,
+                            export_selected_objects=True,
+                            apply_modifiers=True,
+                            export_triangulated_mesh=True,
+                            export_normals=True,
+                            export_uv=False,
+                            export_colors='NONE',
+                            global_scale=1.0,
+                            forward_axis='Y',
+                            up_axis='Z'
+                        )
+    
+    bpy.ops.object.select_all(action='SELECT')
+    bpy.ops.object.delete(use_global=False)
+    bpy.ops.outliner.orphans_purge()
+    bpy.ops.outliner.orphans_purge()
+    bpy.ops.outliner.orphans_purge()
+
+# ---
+
+importDir = "PLY0/"
+outputDir = "PLY1/"
+if not isdir(outputDir): mkdir(outputDir)
+#
+counter = 0
+for file in glob.glob(importDir + "*.ply"):
+    model_name = pathlib.Path(file).stem
+    if pathlib.Path(outputDir+model_name+'.ply').is_file() == True: continue
+    bpy.ops.wm.ply_import(filepath=file)
+    counter = counter + 1
+    if counter > 10:
+        bpy.ops.object.select_all(action='SELECT')
+        
+        mesh_obs = (o for o in bpy.context.selected_objects
+        if o.type == 'MESH' and o.dimensions.length)
+        for o in mesh_obs:
+            o.scale *= 2 / max(o.dimensions)
+            o.scale *= 0.55
+            
+        bpy.ops.object.origin_set(type='GEOMETRY_ORIGIN', center='BOUNDS')
+        
+        for obj in bpy.context.selected_objects: obj.location = (0,0,0)
+
+        for obj in bpy.context.selected_objects:
+            bpy.ops.object.select_all(action='DESELECT')
+            obj.select_set(True)
+            bpy.ops.wm.ply_export(
+                                    filepath=outputDir+model_name+'.ply',
+                                    filter_glob='*.ply',
+                                    check_existing=False,
+                                    ascii_format=False,
+                                    export_selected_objects=True,
+                                    apply_modifiers=True,
+                                    export_triangulated_mesh=True,
+                                    export_normals=True,
+                                    export_uv=False,
+                                    export_colors='NONE',
+                                    global_scale=1.0,
+                                    forward_axis='Y',
+                                    up_axis='Z'
+                                )
+                                
+        bpy.ops.object.select_all(action='SELECT')
+        bpy.ops.object.delete(use_global=False)
+        bpy.ops.outliner.orphans_purge()
+        bpy.ops.outliner.orphans_purge()
+        bpy.ops.outliner.orphans_purge()
+        counter = 0
+
+# ===
+bpy.ops.object.select_all(action='SELECT')
+bpy.ops.object.delete(use_global=False)
+bpy.ops.outliner.orphans_purge()
+bpy.ops.outliner.orphans_purge()
+bpy.ops.outliner.orphans_purge()
+# ===
+
+for file in glob.glob(importDir + "*.ply"):
+    model_name = pathlib.Path(file).stem
+    if pathlib.Path(outputDir+model_name+'.ply').is_file() == True: continue
+    bpy.ops.wm.ply_import(filepath=file)
+    
+    bpy.ops.object.select_all(action='SELECT')
+    
+    mesh_obs = (o for o in bpy.context.selected_objects
+    if o.type == 'MESH' and o.dimensions.length)
+    for o in mesh_obs:
+        o.scale *= 2 / max(o.dimensions)
+        o.scale *= 0.55
+        
+    bpy.ops.object.origin_set(type='GEOMETRY_ORIGIN', center='BOUNDS')
+    
+    for obj in bpy.context.selected_objects: obj.location = (0,0,0)
+    
+    for obj in bpy.context.selected_objects:
+        bpy.ops.object.select_all(action='DESELECT')
+        obj.select_set(True)
+        bpy.ops.wm.ply_export(
+                                filepath=outputDir+model_name+'.ply',
+                                filter_glob='*.ply',
+                                check_existing=False,
+                                ascii_format=False,
+                                export_selected_objects=True,
+                                apply_modifiers=True,
+                                export_triangulated_mesh=True,
+                                export_normals=True,
+                                export_uv=False,
+                                export_colors='NONE',
+                                global_scale=1.0,
+                                forward_axis='Y',
+                                up_axis='Z'
+                            )
+        
+    bpy.ops.object.select_all(action='SELECT')
+    bpy.ops.object.delete(use_global=False)
+    bpy.ops.outliner.orphans_purge()
+    bpy.ops.outliner.orphans_purge()
+    bpy.ops.outliner.orphans_purge()