Project File Edit

Wrap3 project file is a simple text file in JSON format. It can be easily read and fixed in any text editor.

Project File Structure

Below is an example of a project file that contains two nodes Load and Subdivide. It first loads a geometry from an *.obj file and then subdivides it. The full project file can be downloaded here.

        "formatVersion": 0,
        "nodes": {
                "Load": {...},
                "Subdivide": {...},
        "timeline": {
                "current": 0,
                "max": 10,
                "min": 0

In some cases it might be useful to be able to find and change a node parameter inside the project file from a text editor or a custom script.

For example, we want to change this project so that it would load a geometry from another *.obj file.

Let’s take a look at the node Load that loads a geometry.

"Load": {
        "isAlwaysVisible": true,
        "nodeId": 0,
        "nodeType": "LoadGeom",
        "params": {
                "fileNames": {...},
                "texture": {...},
                "transform": {...},
                "visualParam": {...}
        "x": 262,
        "y": 242

We can see that the node has 4 parameters one of which is fileNames.

"fileNames": {
        "connectedNodeId": -1,
        "dataType": "StringList",
        "value": [ "C:/Models/Alex.obj" ]

Changing a file name is straightforward. All we need is to do is to change the line

"value": [ "C:/Models/Alex.obj" ]

to the line

"value": [ "C:/Models/John.obj" ]

Edit Project File with Python

The previous operation can be done with few lines of Python script

import json
f = open('Project.wrap','r')
project = json.loads(
project['nodes']['Load']['params']['fileNames']['value'] = ['C:/Models/John.obj']

To write the edited project back to file we can do

f = open('Project.wrap','w')

You can also use a Command Line Interface to compute the edited project in Wrap.


The project file format is not guaranteed to be consistent in future. You can use project edit as a temporal solution for automation until we include a Python scripting support to Wrap3.