Can OpenROAD 3D Viewer show chiplet inter-die routing/bumps/TSVs?

[b73806114-ui]

I recall that when the OpenROAD 3DBlox 3D Viewer was released in Feb 2026, it could only display chiplet solid blocks, with no support for inter-chip wiring, bumps or TSVs.

Has this feature been implemented on the main branch so far? If not, is there any development plan for interconnect 3D rendering?

[maliberty]

@jorge-ferreira-pii please respond

[jorge-ferreira-pii]

Not yet; the 3D viewer still draws chiplets as solid boxes plus DRC markers.

Bumps are meanwhile visible in the 2D viewer as COVER_BUMP instances; TSVs have no dedicated support in either viewer.

No committed plan. The earlier call was that the interconnect would be too expensive to draw, but that's worth revisiting: the server, launching OpenRoad with -threads count|max, now scales the web server too. What remains is payload size at realistic bump counts, which points to level-of-detail rather than a blocker.

[maliberty]

I was talking with @gadfort about displaying the bumps as well. I think it is too much data to send across server-browser boundary. One thought is to do the usual 2d render of them into an image to send across and use as a texture for the top box face.

[gadfort]

I would add that we should also send the backside texture for die with backside metalizations

[jorge-ferreira-pii]

When we say "render the bumps", is the texture just the COVER_BUMP instances, or the full 2D render of top metal + RDL so you can see what the bumps connect to?

But I can implement a version and test it on a small 3DBlox.

[maliberty]

I suppose you could use the regular display controls to manage what is drawn