I guess that “Blend surface” plays it safe and uses it’s own tolerance method to make everything super tight between surfaces? Not active (rendered as unpickable grey text) if “Position” or “Tangency” is selected. https://mcneel.myjetbrains.com/youtrack/issue/RH-35431, https://mcneel.myjetbrains.com/youtrack/issue/RH-2269. Rhino 6 has issues with custom arrangement of toolbar menus. Example number 1 on the left shows how the blend surface appears at the very beginning. In my Rhino 6 Evaluation version (6.2.18065.11031, from 6.3.2018) the “BlendSrf” command sometimes performs worse than the same command in Rhino 5.

This is where a more specific guide (separate options “Match target isocurve U direction” and “Match target isocurve V direction” in the Match surface panel) will help it create the desired matching to the true U or V isocurve direction of the split surface. The BlendSrf command creates a blend surface between two surfaces. In this situation the modeler is forced to either manually deselect the unnecessary edges, or to manually pick the desired edges one by one while the “AutoChain” is turned off. “Match target edge”. Some CAD programs feature similar custom input, but in a different way.They allow the user to set a custom length from the end of the blend surface where it will lose its G2 continuity in favour of G0. Moves the seam points to the way they were at the beginning of the command. I added a description for these above. Another suggestion for a future improvement of the Blend surface tool and its window. Make sure there is enough room for the blend surface to trim and join with adjacent surfaces.

Hi Pascal, I see what you mean here. Perpendicular. The second image is an improved menu design that is a bit higher to include a dedicated “Draft angle control” box. Rhino 6’s “Blend surface” creates an excessive number of control points that are not necessary most of the time. If the edges of two surfaces you are trying to blend share a corner intersection, the. Rhino can create, edit, analyze, and translate NURBS curves, surfaces, and solids in Windows. Matches the blend surface either to the U or V direction of the target surface, as I explained this in my previous post. In Rhino 5, I can add as much extra shapes (through the “Add shapes” button), but the default control shapes are always two (at the start and the end of the blend surface), allowing me to manually adjust the intermediate shape the way I wand.

In order for this to work, both surfaces need to have open edges that are -ideally- of similar shape and relatively close by. Looks like in these situations with diagonally split surfaces Rhino is getting confused which direction is the target one (U or V) and can’t predict the intent of the modeler. Rhino3d v6 for Windows - Modelling Enhancements | One View, Sweep and Blend Surface with History Click to watch our Rhino v6 Video Interested in finding out about which hardware and operating systems work best with Rhino 6? Since it works in Rhino 5, I think that this bug in Rhino 6 is something that could be easily fixed by the team at McNeel. This could be even more useful if Rhino 7 implements a live preview of the gap between the target edge and the blend surface edge while running the “Blend surface” command. This is somewhat implemented in the Patch command and I find it quite useful. Optionally, this may add an additional row of control points across the middle of the blend surface so that its both ends remain unaffected by the curve rail. Then, I used probably the most overlooked option of “Match surface” called “CurveNearSurface = On”. It resets the original position, angle and size of the handles. Check to dynamically display a preview as the options change. If the curvature influence is set to 0%, this will basically work as Tangent, even though the modeler had the G2, G3 or G4 selected. You will notice that I also included “Automatic” and “Reset handles” in the middle of the menu. If I only rebuild one of the original two surfaces used for the creation of the blend surface inbetween, the history is still enabled and any change in the control points of these two surfaces will affect the blend surface, too.

“Automatic”. This image has “Rotate start of 1 by” (etc) renamed to “Handle 1a” (etc) if we assume that in the future the viewport display of handles 1 and 2 is changed to 1a, 1b, 2a and 2b. Mary Ann Fugier, Robert McNeel and Associates. Example: If the start of side 1 is set to 5 degrees, and the end of side 1 is set to 0 degrees, this means that the middle of the blend surface’s edge will be rotated by 2,5 degrees in relation to the target surface edge. Rhino also supports polygon meshes. This is a very good feature and if you ever decide to implement the full resetting of the handles in a future update, the existing partial resetting could co-exist as both of them do different job and are equally useful. This never happened in Rhino 5 where the continuity was perfect at all times.

“Rotate start of 1 by”, “Rotate end of 1 by”, “Rotate start of 2 by” and “Rotate end of 2 by” (or just “Draft angle”). Example 3 shows how my proposed limited auto chain could work, by offering to match the surface only to those edges (and/or curves) that are close to the surface we match.

Here is a visualization of my idea. Depending on the shape of the model, this may lead to frustration, especially without a 3d mouse for camera navigation. (moreover, the surface generated with blend srf should, automatically, propose a “remove_multi_knot”, avoiding useless waste of time; the surfaces should have, in automatic, few control points, and not many and useless, overflowing). In this context you’d need extra UI to specify U or V direction. Notes If you try to create a blend between a surface and a hole in another surface that is exactly the same size as the surface, Rhino will be forced to make the blend surface dip in quite a bit so it is smooth to both surfaces. In my above example I drew curves directly on the target surface with “Interpolate curve on surface”. I mainly use the “SetObjectDisplayMode” command to hide the geometry of objects while still having their wireframe visible in the scene.

Then I built a lofted surface between both curves. I also have a few suggestions for the BlendSrf command: Is it possible to add a “Relax shape” option whose purpose is to smooth out the middle rows of the blend surface, without affecting the height of the surface at both both ends? 17-Sep-2015, Select and adjust control points or press.

Here is an image to explain that visually. Maybe an additional clickable option in the command line named “Use last”? Rhino 6’s “Blend surface” creates an excessive number of control points that are not necessary most of the time.

Rhinoceros 6 for Windows / Modelling Enhancements - One View, Sweep and Blend Surface with History: In this video, Rhino ART Phil Cook of Simply Rhino UK takes a look at Rhino v6 improvements focuses on One View, Sweep and Blend Surface.

Check the picture with the Zebra stripes. If you try to create a blend between a surface and a hole in another surface that is exactly the same size as the surface, Rhino will be forced to make the blend surface dip in quite a bit so it is smooth to both surfaces. By default the shape curves are perpendicular to the surface edge or parallel to the surface isocurves. Example: a) When I build two simple flat surfaces with Degree 1, then use the BlendSrf command between them, Rhino 6 will create a Blend surface with Degree 5 (CV count = 6) and Degree 1 (CV count = 2). If the history gets broken or “confused” in similar situations, is not it possible to just show a warning, or at least preserve the curve the way it was before the edge/surface/solid was affected with the Trim, Explode or ExtractSrf command. This will basically turn it onto a “Sweep 3 rail” command.”. Add additional curve profile shapes to increase control over the blend surface shape. In the same way, if we have the blend surface divided into 10 sections, we will be able to create advanced blend surfaces with greater control over the overall shape.

Controls the level of continuity required between segments to be selected with the AutoChain option. Why are Class-A surfaces such a big deal for cars, but not industrial design / architecture? Sometimes some holes appear in rendering between blend surfaces and their original surfaces appear in rendering.

The UVN command is too limited and slow in these situations. Just like it did in Rhino 5. b) But… If I rebuild one of these perfectly flat surfaces with Point count 10, Degree 3 and span counts 7 in both UV directions, the Blend surface that I already had (with History enabled) will rebuild itself into a surface with Degree 5 (CV count = 6) and Degree 3 (CV count = 4).

Also, I have another proposition for the “Blend surface” and “Match surface” commands. For example, every time I start Rhino 6 with various toolbars arranged at the bottom, the “Osnap” is missing, even though it was there in the last session.

If the gaps between the surfaces vary, this option maintains the height of the shape curves throughout the blend.

It’s a bit funny that “Match surface” only requires 4 control points along the blend edge to achieve G2 continuity (using the same input surfaces split by isocurve), while “Blend surface” requires 6. Your note on the image only points out the direction you care about and not the other one…. Being able to divide the “Blend surface” into custom number of segments greatly increases the ability to manually adjust its shape via control point manipulation, prior applying “Match surface”. Currently, if the “Chain edges” is activated and “AutoChain” is set to “on”, that will try to select many more edges than necessary.

*Only showed in my second image. The angle relationships between surfaces, sharpness of the bend in the edge around corners, and blend type all play a part in any particular case. My proposition for the “Divide edge” option is basically a “Rebuild surface U” inside “Blend surface” while the latter command is still active. With symmetry, point editing is mirrored to the other end of the curve. And makes an approximation between both U and V directions?

I have 3d Connexion SpacePilot (the old discontinued model, not the more recent “SpacePilot Pro” one) that works flawlessly in Rhino 5, but in Rhino 6 I noticed that 3d Connexion’s automatic rotation center no longer can “see” through solids and surfaces that were given a custom “wireframe” viewport setting through the “SetObjectDisplayMode” command.

Always blend from the largest radius to the smallest radius across a model.

Check the Lock box to maintain the relationship between the two curve ends. Select a seam point marker, and move it along the closed curve. However, if I rebuild the 2nd surface, the blend surface will no longer have its history enabled. Hello - this is the same in V6 - if the edges are simple (untrimmed) , then the blend surface can be as well.

Along with “Divide edge”, I also proposed two more options for rebuilding the surface: “Distance from edge” (similar to “Refine match > Distance” in the “Match surface” tool) and “Minimum CP distance” (it will prevent building of blend surface with extremely dense control point structure). This allows the modeler to set individually controlled amount of rotation to each of the 4 handles that are used to control the shape of the blend surface. I think, though, that matching side edges is an understandable and legitimate thing to be able to do, whatever the UI. This also happens if I delete the Blend surface and try to build a new one. Displays the potential surface in a shaded preview. For example, if I want to create a blend surface whose last 25% smoothly turn into a crease line, then the program should allow me to divide the blend surface into 4 sections where I set G2 for the first 2 sections (equal to 50% of the total length), G0 for the 4th section (equal to 25% of the total length) and the 3rd section (another 25%) is leaved for the smooth transition between G2 and G0.

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