Do objects created using Geo nodes not work with needle?

🌵 Needle Engine
1

I’m trying to display a model I created using geometry nodes on a browser. But everything but the object appears on it

2

Hi Kanmol5,

Objects created using Geometry Nodes are not directly compatible with Needle Engine unless they are converted to a format that Needle can work with. The primary concern is ensuring that the geometry is valid and appropriately structured for rendering.

Here are a few steps to troubleshoot the issue:

  1. Export as Geometry: Ensure that your geometry nodes output a valid mesh. Sometimes, the resultant geometry might need to be baked into a mesh format that is compatible with Three.js, which Needle Engine is built upon.

  2. Check Geometry Validity: Implement a function to check whether the geometry complies with Needle’s standards. For example, it should have indices, valid bounding boxes, and a proper structure as shown in the code for checking raycasting compatibility:

    function canRaycastGeometry(geo: BufferGeometry): boolean {
    // If the geometry has an index buffer but no indices, we can't raycast
    if (geo.index && geo.index.array.length < 3) return false;
    return true; // Add other checks as necessary
}

  3. Logging: Add console logs to check if the geometry property of the mesh is valid. This will give you insight into what is lacking in the geometry.

  4. Rendering Process: Ensure that the processes setting up the scene and adding the geometry to it are correct. If you’re having trouble visualizing the model, there might be issues in how the scene is set up, which could not easily display objects not being correctly rendered.

  5. Check for Errors: Always watch the browser console for any errors or warnings that could give a hint about what might be going wrong during rendering.

If you follow these steps but continue to face issues, consider simplifying your geometry or testing with other basic geometries to isolate the problem.

You can explore further in the Needle Engine documentation regarding compatibility and rendering, or share specific issues/errors if you need further assistance.

Feel free to ask more detailed questions about any of these steps!

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