merge_prims_by_mtl

import os
import glob
import hou

# User inputs
folder_path = '/server/hdri'
file_mask = '*_acescg.exr'
exclusion_wildcards = 'blank,do_not_use'  # Comma-separated exclusion wildcards
start_frame = 1001
interval = 5  # Interval frame number to make changes over time

# Get the Python SOP node
node = hou.pwd()
geometry = node.geometry()

# Get all the .exr files from the folder with the given mask
file_pattern = os.path.join(folder_path, file_mask)
exr_files = sorted(glob.glob(file_pattern))

if not exr_files:
    raise ValueError(f"No files found with pattern: {file_pattern}")

# Filter out files based on exclusion wildcards
exclusion_list = [wildcard.strip() for wildcard in exclusion_wildcards.split(',')]
filtered_files = [f for f in exr_files if not any(excl in f for excl in exclusion_list)]

if not filtered_files:
    raise ValueError("No files left after applying exclusion wildcards.")

# Set file_name attribute as a detail attribute based on the current frame
geometry.addAttrib(hou.attribType.Global, 'file_name', '')
current_frame = hou.intFrame()

# Determine the index of the file to use based on the current frame
if current_frame >= start_frame:
    index = (current_frame - start_frame) // interval
    if index < len(filtered_files):
        base_name = os.path.basename(filtered_files[index])
        geometry.setGlobalAttribValue('file_name', base_name)
    else:
        geometry.setGlobalAttribValue('file_name', '')  # Set to empty if out of range
else:
    geometry.setGlobalAttribValue('file_name', '')  # Set to empty if before start_frame