ModelPrimitive: Size instead of scale

[jdsika]

The current model-primitive uses pose and scale to position it. In order to figure out the scaling I would need to know the actual dimensions of the model. When considering a gLTF model I would need to open the model first, extract the size in order to calculate the correct scale for this primitive.
My suggestion is to explore the option to add the parameter of size to e.g. automatically scale a model to a pre-set bounding box. If the size is not encoded in the url represeting the identifier to this model on e.g. a server a plugin is not easily able to do this scaling calculation.

https://docs.foxglove.dev/docs/visualization/message-schemas/model-primitive

[aneuwald-ctw]

Hello @jdsika,

It seems interesting indeed. We will give a look to check if it is possible and the impact of this. Thanks for the contribution.

Cheers,
Alex

[jdsika]

Hi @aneuwald-ctw ,

I was now talking to a colleague who works a lot with 3D models. He says that the models shall always have the correct size and the scale shall be 1 in every direction. The scaling of models is not recommended. For OSI we will have a clear requirement. The bounding box of the object that is represented by a 3D model must have a correct bounding box in the OSI data that matches the gLTF which shall be loaded by Lichtblick.

The data can be trusted as the bounding box is defined in the model metadata -> the scenario is loading and using the values from the model -> the simulator writes these values into the OSI message.

Therefore keep my suggestion as a thought that seems to have no merrit. Thank you for your time!