Currently if you load a multi-LoD dataset the parents are all loaded as LoD0 in the tree view. Perhaps it's better to summarise them as multi-LoD or something that is more indicative?

The question mark icons in the attribute box regarding parents and children are currently confusing and need to be resolved in a clearer way

Please clarify what license does the software have. Although the code is public for everyone to see, it is legally not possible to contribute or to reuse it in any way until the conditions for it are specified.

It is not possible to resize the menu on the left-side that shows CityObjects. When the attributes bar is also open, there is very little space for the model. It would be nice to be able to resize the left-side menu and the attributes bar.

It would be great if the colour of the icons in the tree view matched the colours set in the settings

those 2 trees have a crown and a trunk, both solids. Only the crowns are shown.

https://www.dropbox.com/s/0dtq13io68ln4n0/t.json?dl=0

Perhaps it would be nice for ninja to support loading a CSV with additional attributes for city features based on unique ids?

Or links to sample data? A sort of "getting started" help for first-time users. Maybe even a "load example dataset" button?

• add support for GeometryTemplates
• add streaming from a WFS3 server, see this
• There should be a radio-button for textures on/off
• Integrate your work into the vuejs components
• Make the visualisation fast
• Backend in flask: https://palletsprojects.com/p/flask/
  • My example for CityJSON and OGC-API: https://github.com/hugoledoux/cityjson_ogcapi
• Upload of textures (which are stored on the flask-server)
• If still time, we find extra tasks later

If you drag the file somewhere else then exactly in the box, it does not visualise the file.

This was available until v0.3.0 but is temporarily disabled.

When new CityObjects that are defined in CityJSON v1.1.0 are present in the file, these are shown with a question mark. They are also not included in the Settings part (e.g., BuildingFurniture, BuildingRoom).

Currently, when surfaces have self-intersecting boundaries the triangulation breaks without giving a proper error/warning message. We should address that.

There is no way to pick an object from the 3D view with a touch screen.

It would be nice to have a way to visualise the materials on the surfaces. Probably @tomvantilburg can provide a sample cityjson file that has materials.

There should be a button to close the attribute pop up because double clicking is sometimes cumbersome

When objects have multiple LoDs, it is not possible to select each representation separately, but the objects are shown in highest LoD (at least in my case). It would be nice to be able to enable/disable different LoDs.

I think it would be useful if you could zoom to feature when you double click. As well as a way to zoom back to original view?

Perhaps an OSM base map can help people navigate more easily

Hi,

I am trying to display data Rotterdam from the tutorial cityjson versioning prototype (https://github.com/tudelft3d/cityjson-versioning-prototype.git) in Ninja , but it cannot display the LOD 2 of the building

I am trying to viewer the same data on Blender, it display the LOD 2 of the building

Is there any step or requirement needed for ninja?

For attributes that are nested. Right now they come out as just a string.

cannot open a .json file from 3D Topografie

A legend basically, and it can be at the top near Settings and Help.

Also not to forget to explain:

• the geometry type appears when you hover over the LoD
• what the icon for geometry templates looks like

Things like the line below:

We could have no reference of a default name or just move to main.

We can edit but not delete, would be nice to have a delete option

This could be done to minimise the freezing time when CityJSON is parsed/triangulated etc.

Resources:

• https://stackoverflow.com/questions/35322965/creating-three-js-meshes-in-a-webworker

Currently when in small window, the left-bar occupies all screen and you can't scroll to see the actual 3D view.

Now, everything is shown in the 3D viewer. There must be a way to toggle the visibility of LoDs (and individual geometries, in general).

Features that would be interesting:

• Toggle LoDs for the whole city model
• Toggle LoD/geometry for every individual city object

The idea is to be able to show the lineage as some sort of timeline.

Right now ninja only checks if a file is JSON or not, but if it's an invalid file or not a CityJSON file specifically then nothing happens. Might be nice to have a pop-up that links to val3dity and cjio. "Have you tried validating your file with val3dity or cjio?"

It would be nice if there was an option that allows for attributes of the parent object to be seen in its children's info card.

Currently, all extension objects are shown with a question mark, which is a bit confusing because it looks like there is something wrong with those objects. It would be nice to have a more clear icon instead.

Some city object has longer list of attributes. The pop up modal box could only show the 20 or so (depending on screen resolution) attributes, and the rest were hidden.

Please see attached screenshot

Setting colours beyond the object type would be great.

Possibilities could be:

• semantic surface
• LoD
• City Object Group/Hierarchy

• fix line in belt
• thicker white outline and outline for separate features
• find a good font

It should be possible to visualise the network directionality

There seems to be an issue in Chrome where the output has a weird triangulation and spikes. This doesn't seem to be an issue in Safari or Firefox.

Hello,

I am new to CityJSON and currently trying to follow every tutorial and instruction on the page.

I would like to view the resulting file noise_data.city.json

I try to load it using Ninja viewer but nothing appear

Am I missing any steps? # #

this file crashes, didn't debug. Two trees with MultiSolid.

https://www.dropbox.com/s/stz8ilhquikm4xh/t.json?dl=0

Currently you double click to select or deselect a feature. This is so there is no mess between selecting and rotating. Sometimes this is not intuitive and feels unnatural. So is it better to have single or double click?

It should be possible to do some schema validation, since JSON schema has a JavaScript library.

It's very nice feature to allow user to set colors they want in the settings. Is it possible to add color picker so user doesn't have to look up for HEX code for the color to fill in the form?

It is also noted that the label/name is somewhat hard to see with the grey background. Is it better that the HEX code is shown in the color it represents itself?

It would be very useful to be able to select semantic surfaces separately. For example, selecting only RoofSurfaces or a specific surface by clicking on the model or from the left-side menu.

so that this dataset can be seen and understood.

Perhaps a switch that is off by default?

• add link to CityJSON and the ninja repo (prominently at the bottom)
• explain the name ninja under help
• blue colour for settings and help should either match logo or clash less
• Upload and Browse are not both necessary on the landing page
• X for deselecting an object would be nice