Currently, Rhino is in something like a NURBS-crisis. Alias made a huge progress in the past 20 years, unlike Rhino’s main NURBS surfacing and control point editing tools that are nearly unchanged since Rhino 2 (with a few minor exceptions). The last few versions of Rhino focused more on non-NURBS s…

I’ve always said it: tools like Blend srf and Match srf (along with the revamped Rhino 9 patch) should be the state of the art in a nurbs surface modeler like Rhino. There is no excuse, especially after decades of continuous development. They represent the basis of modeling; tools that allow you to…

Very well said. While I welcome every improvement in any tool in Rhino, I’m surprised that “Blend surface” and “Match surface” receive the least love from the developers… This is super strange, because both “Blend surface” and “Match surface” are basically the main tools of every NURBS modeling soft…

[image] Gijs: BlendSrf: Flip button Yes please! Or better the capability to invert the handles position without bugging the construction. Today if you get a flipped blend handle and you try to move at the opposite position the command stop to work.

Yet another bug that must be fixed is the inability of “TweenSurfaces” to build a proper median surface between two surfaces that are positioned at 90 degrees or greater relative to each other. Here is a detailed explanation (and a partial fix for planar surfaces only) of the bug: [ima…

Yet another urgent improvement of Rhino must be the addition of “Shading falloff” for the tiny objects in the viewport. This is a 3d performance fix that could easily increase the framerate on projects that consists a huge amount of small details such like screws, trees, buildings etc. I believe tha…

[Screenshot 2026-05-21 131926] Hi Bobi Tried in most recent wip: does work. The blend surface is a single span degree 5 surface in both directions

Thanks! That’s a great news. :slight_smile: Often times I’m forced to change the degree of certain surfaces (even simple planes) just to avoid the unnecessary creation of multiple spans. If you adjust just one of the “Interior shapes”, is the resulting blend surface smooth, or its control points ar…

It’s a bit finicky, but easy enough to manage. You probably have to adjust all interior shapes of any side where you manipulate them. This screenshot is of the active tool where I adjust the interior handles: [Screenshot 2026-05-21 174350]

Does it exhibit this bug when just one of the interior handles is being adjusted? Misleading preview: [image] Resulting surface: [image]

Rhino urgently needs these tools!

Rhino

Rhino_Bulgaria (Bobi) May 20, 2026, 5:18pm 117

Check the post to which I reply here. Could someone with the today’s Rhino 9 WIP test several cases with building a blend surface between two existing surfaces with different degree and number of control points?

The latest Rhino 9 WIP is supposed to include a fix for this bug:

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Rhino urgently needs these tools!

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