How to use Retopology

[GoudaCouda]

am trying to use retopology with the Python Api but when I run the script it will run it but the output mesh is the exact same. I have tried using both the 3dsmax.exe and the batch exe both say script completed successfully but the mesh remains the same. When I use 3dsmax it will launch and say retopology completed 0s. It seems its just running but then instantly completing or something.

Example Code I am trying

import pymxs
from pathlib import Path

# --- Paths (Hardcoded for simplicity) ---
INPUT_OBJ_PATH = r"C:\Path\To\Your\Input\Model.obj" 
OUTPUT_OBJ_PATH = r"C:\Path\To\Your\Output\RetopoModel.obj"

# --- Core Script Execution ---

# Get the MAXScript runtime interface
rt = pymxs.runtime

# Convert paths to posix style for MaxScript compatibility
input_path_posix = Path(INPUT_OBJ_PATH).as_posix()
output_path_posix = Path(OUTPUT_OBJ_PATH).as_posix()

# --- Import ---
nodes_before = set(rt.objects)
rt.importFile(input_path_posix, rt.Name("noPrompt"), using=rt.ObjImp)
nodes_after = set(rt.objects)
new_nodes = list(nodes_after - nodes_before)

# Find the first suitable geometry node (simplified selection)
imported_node = None
for node in new_nodes:
    if rt.isKindOf(node.baseObject, rt.GeometryClass) and not rt.isKindOf(node, rt.TargetObject):
         # Basic check - might need refinement depending on OBJ structure
         imported_node = node
         break

# --- Apply Modifier ---
rt.select(imported_node) # Select the node
modifier_instance = rt.RetopologyComponent() # Create the modifier instance
rt.addModifier(imported_node, modifier_instance) # Add it to the selected node
retopo_comp = modifier_instance # Get a reference to the modifier component


# --- Compute ---
retopo_comp.ComputeRetopology() # Trigger the computation

# --- Export ---
rt.select(imported_node) # Ensure the node is selected
rt.exportFile(output_path_posix, rt.Name("noPrompt"), selectedOnly=True, using=rt.ObjExp)