Hex Values to Indices

2024-03-29 12:03 UTC gpt-4 Open in ChatGPT ↗

Houdini Python. i have a text file where every line contains point data in this format : x1, y1, size1, hex_value1 , x2, y2, size2, hex_value2,…i want to read in houdini python this file, get all the unique hex values and replace the original with their corresponding indices, so x1, y1, size1, hex_value1 , x2, y2, size2, hex_value2,.. will become this x1, y1, size1, index1 , x2, y2, size2, index2,.. Use my code as base :

import os

node = hou.pwd() geo = node.geometry()

#get parms filepath = node.parm(‘filepath’).evalAsString() output = node.parm(‘output’).evalAsString() framestart = node.parm(‘framerangex’).evalAsInt() isExist = os.path.exists(filepath) outExist = os.path.exists(output)

if isExist: # print(“INPUT file: ” + filepath + ” EXISTS!”) if outExist: print(“OUTPUT file: ” + output + ” EXISTS!”) else: # Read txt file line by line file1 = open(filepath, ‘r’) Lines = file1.readlines()

Extract unique hex values

Replace hex values from ‘Lines’ with their corresponding index to the unique hex values

Write the modified content to the output

i have also attached the input file

To integrate the functionality you requested into your existing Python code for Houdini, we’ll add the steps to:

Extract all unique hex values from the input file.
Replace the original hex values with their corresponding indices.
Write the modified content to the output file.

Here is the modified version of your script:

import os

node = hou.pwd()
geo = node.geometry()

# get parms
filepath = node.parm('filepath').evalAsString()
output = node.parm('output').evalAsString()
framestart = node.parm('framerangex').evalAsInt()
isExist = os.path.exists(filepath)
outExist = os.path.exists(output)

if isExist:
    if outExist:
        print("OUTPUT file: " + output + " EXISTS!")
    else:
        # Read txt file line by line
        with open(filepath, 'r') as file1:
            Lines = file1.readlines()

        # Extract unique hex values and create a dictionary with their indices
        hex_values = []
        for line in Lines:
            parts = line.strip().split(',')
            for i in range(3, len(parts), 4):  # Starting from index 3, every 4th element is a hex value
                hex_values.append(parts[i])
        unique_hex_values = list(set(hex_values))
        hex_index_dict = {hex_val: idx for idx, hex_val in enumerate(unique_hex_values)}

        # Replace hex values in 'Lines' with their corresponding index from the dictionary
        modified_lines = []
        for line in Lines:
            parts = line.strip().split(',')
            new_line = []
            for i in range(len(parts)):
                if i % 4 == 3:  # Replace hex values
                    hex_val = parts[i]
                    new_line.append(str(hex_index_dict[hex_val]))
                else:
                    new_line.append(parts[i])
            modified_lines.append(','.join(new_line))

        # Write the modified content to the output file
        with open(output, 'w') as file_out:
            for line in modified_lines:
                file_out.write(line + '\n')

        print("Processing complete. Modified data written to:", output)
else:
    print("Input file does not exist.")

Ensure that you have defined the filepath and output parameters on the Houdini node this script is attached to, and that they point to the correct locations for your input and output files.

This code reads your input file, extracts all unique hex values, replaces those hex values with their indices, and writes the modified content to a specified output file. The hex values’ indices are determined by their order of appearance in the unique list of all hex values found in the input file.