GLTF Loader

[Josh]

This is using json for modern C++. I don't know how to navigate the json data, but at least I can load it:

		nlohmann::json j3;

		int sz = stream->GetSize();
		if (sz <= 4) return false;

		if (stream->ReadString(4) == "glTF")
		{
			if (sz <= 20) return false;
			int version = stream->ReadInt();
			int length = stream->ReadInt();
			int model_length = stream->ReadInt();
			int model_format = stream->ReadInt();
			int binstart = 20 + model_length;
			int binsize = sz - 20 - model_length;

			if (20 + model_length > sz or model_length < 1 or model_format != 0x4E4F534A) return false;
			
			std::vector<uint8_t> data;
			data.resize(model_length);
			Assert(data.size() == model_length);
			stream->Read(&data[0], model_length);
			j3 = nlohmann::json::parse(data);			
		}
		else
		{
			stream->Seek(0);
			std::string contents;
			while (!stream->Ended())
			{
				contents += stream->ReadLine() + "\n";
			}
			j3 = nlohmann::json::parse(contents.c_str());
		}

		//Now interpret json data and build model...
		if (j3.type() != nlohmann::json::value_t::object)
		{
			return false;
		}

		//auto obj = j3.value.get_impl_ptr();//????

 

[Josh]

The fact that we finally have built-in support for a 3D model format in Windows is what makes this compelling to me.

[gamecreator]

Does that work in 7?  And can you rotate/zoom it in the preview pane?

[Josh]

You can rotate and zoom, no pan. I think it was added in the Win 10 creator edition or whatever.

[Josh]

It supports FBX as well, but FBX cannot be used for your final game format, and GLTF can.

[catch22]

Wonder how long till someone YAMLs or BSONs it for file size?

JSON is great, I work with it everyday, but it's it's a little heavy around the waist since it's notation/markup is a bit excessive.  Being a Ctype struct expression, it moves between languages very easily as well.

Now we should ditch lua and go javascript rite? hue

[Josh]

1 hour ago, catch22 said:

Now we should ditch lua and go javascript rite? hue

[catch22]

You've said crazier things?!