How might I go about exporting a .obj file from playcanvas at runtime?

Grimmy · July 19, 2024, 1:01pm

Hi, anyone know if some kind of exporter already exists that I could use? Has anyone already done this?

Thanks

mvaligursky · July 19, 2024, 1:28pm

We have a script which can load an obj file and create entities with model components here:

playcanvas/engine/blob/main/scripts/parsers/obj-model.js

// Sample Obj model parser. This is not added to built into the engine library by default.
//
// To use, first register the parser:
//
// // add parser to model resource handler
// var objParser = new pc.ObjModelParser(this.app.graphicsDevice);
// this.app.loader.getHandler("model").addParser(objParser, function (url) {
//     return (pc.path.getExtension(url) === '.obj');
// });
//
// Then load obj as a model asset:
//
// var asset = new pc.Asset("MyObj", "model", {
//    url: "model.obj"
// });
// this.app.assets.add(asset);
// this.app.assets.load(asset);
function ObjModelParser(device) {
    this._device = device;
    this._defaultMaterial = new pc.StandardMaterial();

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You could write something similar, but in reverse - use entity (with model or render component), and convert those to obj file format.

Not much code most likely, so a possible option.

The other related option would be to export to glb or usdz, for which we have code and example:
https://playcanvas.github.io/#/loaders/gltf-export
https://playcanvas.github.io/#/loaders/usdz-export

Grimmy · July 19, 2024, 1:31pm

Great. Thanks for the pointers!