blender batch decimate

decimate.py

# blender.exe -b -P decimate.py -- --input_file crate.glb --output_file output.glb
import bpy
import sys
import math

args = sys.argv
input_file = None
output_file = None

i = 0
while i < len(args):
    if args[i] == '--input_file' and i + 1 < len(args):
        input_file = args[i + 1]
        i += 2
    elif args[i] == '--output_file' and i + 1 < len(args):
        output_file = args[i + 1]
        i += 2
    else:
        i += 1

if not output_file:
    sys.exit("No output file specified. Please provide an output file path.")

print(f'Input file: {input_file}')
print(f'Output file: {output_file}')
# input()

# bpy.ops.wm.open_mainfile(filepath=input_file)
bpy.ops.import_scene.gltf(filepath=input_file)

bpy.ops.object.select_all(action='DESELECT')

for obj in bpy.context.scene.objects:
    if obj.type == 'MESH':
        obj.select_set(True)
        bpy.context.view_layer.objects.active = obj

        bpy.ops.object.modifier_add(type='DECIMATE')
        modifier = obj.modifiers["Decimate"]
        modifier.decimate_type = 'DISSOLVE'
        angle_deg = 30
        modifier.angle_limit = (angle_deg / 180) * math.pi
        # modifier.use_collapse_triangulate = True
        bpy.ops.object.modifier_apply(modifier="Decimate")

bpy.ops.export_scene.gltf(filepath=output_file, export_format="GLB")