Hi
I’m using NullEngine for server-side project in Node.js and exporting a scene to GLB via GLTF2Export.GLBAsync. The textures are loaded from local GLB files via the glTF loader.
The Problem:
Exporting fails with:
Error: Failed to read pixels from texture MyTexture (Base Color).
at GetTextureDataAsync (textureTools.js)
at GLTFMaterialExporter._exportTextureImageAsync (glTFMaterialExporter.ts)
I know this is because the nullNullEngine does not have a WebGL context and can not read readPixels.
However. I found a workaround like this. I’m monkey patching the createTexture function
const _origCreateTexture = engine.createTexture.bind(engine);
engine.createTexture = function (
urlArg: string,
noMipmap: boolean,
invertY: boolean,
scene: any,
samplingMode?: number,
onLoad?: ((texture: InternalTexture) => void) | null,
onError?: any,
buffer?: any,
...rest: any[]
): InternalTexture {
const texture = _origCreateTexture(urlArg, noMipmap, invertY, scene, samplingMode, onLoad, onError, buffer, ...rest);
if (buffer) {
texture._buffer = buffer;
}
return texture;
};
So it seems that there its just missing to store the buffer there.
Would it make sense to add texture._buffer = buffer to NullEngine.createTexture()? Since NullEngine can never read pixels from the GPU and this would make sense in this use case I think.
Thank you
