MeshcatVisualizer doesn't obey IllustrationProperties ("phong", "diffuse_map")

[SeanCurtis-TRI]

What happened?

When specifying a texture for an object via ("phong", "diffuse_map") the texture does not get applied to the model in Meshcat. It should.

Version

No response

What operating system are you using?

No response

What installation option are you using?

No response

Relevant log output

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[SeanCurtis-TRI]

Duplicated and elaborated by #19077.

[jwnimmer-tri]

This one was about Meshcat. (The actual 3js scene.)

That one was about Meldis. (We're failing to even transmit the data.)

[SeanCurtis-TRI]

A fair point. Both of these, ultimately, are transmission errors. In this case, the texture information simply doesn't get transmitted from Meshcat/MeshcatVisualizer. meldis is lacking input via LCM messages. MeshcatVisualizer has the data, but doesn't send it.

[SeanCurtis-TRI]

BTW When it works it looks like this:

MESHCAT:

The corresponding RenderEngineVtk

The basic scaffolding (but incomplete) can be found in this branch.

[SeanCurtis-TRI]

Note: These images exhibit the issue raised in #20495. The sphere and ellipsoid have been massaged so that they match. At first glance, the boxes may look the same, but they're not. There is no simple operation (like that used on the sphere/ellipsoid) that can be employed on the other shapes to achieve the same end.