Hi everyone, I just wanted to take some time to introduce you to the new Style Spline in SolidWorks Together they form the control polygon, or hull of the curve. The more control points, the higher degree of the curve and more complex you can make its shape. B-Splines on the other hand use multiple polynomials to achieve their shape, and are a generalization of multiple curves.

I like to think of a B-Spline as a series of overlapping curves. The regions in between each through point are called spans, so it is possible to have multiple spans. The user can also weight the tangency and control the vector at each through point.

What this means is that a B-Spline is capable of making very complex curves very easily. The degree and number of generalized curves that make up the overall shape is not controlled by the user, but rather by an algorithm that adjusts depending on how much control the user requests of the curve. This can vary since you can apply curvature constraints at the endpoints, and can use the spline handles at each through point. Note as you pull on spline handles and apply constraints at the endpoints, the control polygon adds new CVs.

This is to accommodate the extra degrees of freedom the user is requesting. This diagram is a good visual of the curves we offer in SolidWorks, in order of increasing flexibility, as well as mathematical complexity.

Why is it useful? So what does all this mean? The intent of the Style Spline is not to replace anything that we currently offer, but to provide something better suited to handle a variety of jobs. As you just learned, the math involved is easier than a B-Spline, but more complex than a conic. Dimensions and relations may also help in shaping the curve, and makes it possible to configure its shape, control it with equations, etc. Our B-Spline on the other hand has a few controls to help shape the curve.

These controls are very powerful of course, and can help the B-Spline quickly achieve some very complex shapes; however these controls can sometimes be the downfall of the curve. Our current spline also has the ability to be shaped by its control polygon as well; however this is something that cannot be referenced. There are some additional behaviors to know about this new curve in SolidWorks. These are all intended to help the user shape the curve faster and easier.

First, when sketching the curve, which is done by its CVs, it is not only possible to infer tangency at the first endpoint, but you can also infer Equal Curvature.You can use B-splines to create complex curves.

You can define and modify them using several controls, including spline points, spline handles, and control polygons. A single B-spline can have multiple through points and spans the region between through points. You can apply curvature constraints at each endpoint.

At each through point, you can weigh the tangency vector and control the tangency direction. You define and control the curves using control vertices.

The control vertices form a control polygon, or hull of the curve. There are no through points, so a style spline has only one span between the endpoints. You can inference style splines for tangency or equal curvature. You can constrain the points and dimension the curves' sides. These curves also support mirroring and self-symmetry.

These curves let you create smooth and robust surfaces, and are available in 2D and 3D sketches. Use the form below to send your comments and suggestions about this topic directly to our documentation team.

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All rights reserved. Spline Tools. Parent topic Sketching. Thank you for your comments. We will contact you if we have questions regarding your feedback. Print Topic Select the scope of content to print: Just this topic This topic and all topics linked from this topic This topic and all children of the topic in the table of contents up to 5 topics.

Never show this message again. Other versions:. Feedback on this topic. User Interface. Moving from 2D to 3D. Design Checker. Detailing and Drawings. Import and Export. Model Display. Mold Design.Knowing they exist, what they do, and how to use them will help you create and shape the curve faster and easier.

Written by Todd Domke on August 8, 3 Comments. In this article, we get even deeper into the functionality of the Style Spline. Knowing that they exist, what they do, and how to use them will help you create and shape the curve faster and easier. The 2 nd CV controls the 2 nd degree of curvature, which is tangency, also called C1 continuity. Therefore, you will see a 2 nd inference line when sketching the 3 rd CV of the curve.

If you snap to it, an Equal Curvature constraint will be applied at that endpoint once the curve is complete. Not too shabby! If the Style Spline terminates on the endpoint of another entity, hold down the [Alt] key as you double click to end the curve in order to automatically apply a tangent relation at that endpoint, otherwise it will be coincident.

Bezier Curve Example - Egg

If you want Equal Curvature at that endpoint, you will still need to apply this manually. When sketching the curve, automatic relations between the CVs and other geometry in your sketch or model are not created. The only exception is at the endpoints of the curve. The reason is due to the fact you are sketching the curve by its CVs; the shape of the curve you end up with most likely will not be final. The CVs need to be free so that the user can drag them to keep shaping the curve.

If desired, you can manually constrain the CVs after the curve has been completed. You can do this with relations, dimensions or both. You can also constrain the construction lines between the CVs. This temporarily disables automatic relations, and will prevent the CV from accidentally getting locked to a vertex, line, or edge in the background.

By doing this, you are adding or removing control. However, if any CV other than endpoints is constrained at all, the spin box will be greyed out. This is to keep the curve from jumping abruptly since all the CVs are not free to adjust in order to maintain shape.

There is a checkbox in the PropertyManager called Local Edit. This setting is to aid the user when working with multiple Style Splines that are connected, yet not fully constrained.

You may have one or two main curves that represent the primary surfaces on your model. Connected to those curves may be other, smaller curves for some secondary surfaces. There are times, when shaping the secondary curves, you may not want to affect the shape of the larger curves. Enabling the Local Edit setting on a particular Style Spline will prevent any CV adjustments from affecting other Style Splines to which it is connected. This option is currently only available for Style Splines.

Creating it in 3D is just as easy and works the same way as creating a series of lines. You can assign a hotkey to the triad to speed up your workflow. Better yet, add it to your Mouse Gestures. Watch the Style Spline in action on YouTube. Its interesting and annniyog that if you use spline dynamics you can move your null around and the spline follows nicely but if you use the soft body when you drag the null or connector around the plane goes wacky and starts bouncing like crazy all over de place.

Is there a way to get the best of both worlds? Hello mr. Can you help me? Just out of curiosity, do anybody administrate the blog here? The same problem is for mePart 3 is readable only. Your email address will not be published. Comments Its interesting and annniyog that if you use spline dynamics you can move your null around and the spline follows nicely but if you use the soft body when you drag the null or connector around the plane goes wacky and starts bouncing like crazy all over de place.You can adjust the smoothness of the curve by manipulating the degree of the curve.

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bezier curve solidworks

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Creating Multiple Point Splines.

Curves Ahead: How to Handle Curves and Splines in SOLIDWORKS

Creating Two-Point Splines with Tangency. Style Spline Support for B-Splines.Creating game-changing products starts with solid designs. Between design, engineering and manufacturing teams, it can be hard to get everyone on the same page.

bezier curve solidworks

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bezier curve solidworks

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Of course, you do!The degree of the curve, or the order of the underlying polynomial, depends on how many control points there are. The more control points, the higher the degree of the curve, the more complex you can make its shape. B-Splines, on the other hand, use multiple polynomials to achieve their shape, and are a generalization of multiple curves. Think of a B-Spline as a series of overlapping, or connected, curves.

The user can also weight the tangency and control the vector at each through point. These controls give a B-Spline the capability of making very complex curves very easily. The degree and number of generalized curves that make up the overall shape is not controlled by the user, but rather by an algorithm that adjusts depending on how much control the user requests of the curve curvature constraints applied at the endpoints, spline handle manipulation at each through point.

It can also, however, allow the curve to get a little… unruly, shall we say? This added complexity can adversely affect the overall smoothness of the curve, introducing small deviations, bumps, and wrinkles which may not be immediately visible in the curve, but that can show up in the resulting geometry that uses the curve. If smoothness aesthetics, ergonomics is your goal, we want to keep the curve as simple as possible, adding complexity more control only when necessary.

This diagram is a good visual of the curves that are available in SolidWorks, in order of increasing flexibility, as well as mathematical complexity.

bezier curve solidworks

So what does all this mean? The reason SolidWorks added the Style Spline is not to replace anything that we currently have, but to provide something better suited for certain jobs. As you can see, the math involved is easier than a B-Spline, but more complex than a conic. Your email address will not be published. Related Topics. Posted by. Leave a Reply Cancel reply Your email address will not be published.

I agree We are using cookies to give you the best experience on our website. By continuing to use the site, you agree to the use of cookies. To find out more, read our privacy policy.To make the CVs more useful when it comes to shaping or constraining the curve, construction lines are added in between each CV during curve creation.

Therefore, controlling this curve is as simple as controlling a series of lines. Users can drag a CV in any direction to change the shape of the curve, or you can drag a construction line to drag two CVs at once.

And since the curve is basically controlled by lines, it can be mirrored, which makes shaping either the seed or the mirrored instance very easy to do.

Also, this curve can be symmetric on itself by simply applying symmetric relations to the CVs around a center line. This is much harder to do with a B-Spline. Dimensions and relations may also help in shaping the curve, and makes it possible to configure and control the shape with equations. The B-Spline, on the other hand, has a few extra controls to help shape the curve. These controls are very powerful, and can help the B-Spline quickly achieve some very complex shapes with much sharper changes in curvature.

However, these controls can sometimes be the downfall of the curve. They are something that most systems implement to help users shape the curve, however there is some serious number crunching going on the in the background.

Style Spline Support for B-Splines

Continuity Shaping the Style Spline is very intuitive and easy to do. This is why a B-Spline is better suited for creating tight curves. However, one area where the B-Spline can fall short is maintaining continuity.

As you shape a B-Spline, especially if you are using spline handles, curvature continuity across each through point can become interrupted. If a smooth curve is important to you, and your shape is not very complex i. Something you can try yourself would be to create the same shape using each type of curve and the available controls. Then, attempt to further shape each curve and note the result on the curvature combs.

The curvature of the Style Spline will always be more smooth and continuous. Quality Finally, another reason why the Style Spline curve might be better suited for the job is due to quality. As mentioned previously, the math is easier, the degrees of freedom are simpler and more transparent, and constraining it is fast and easy. It has the potential to be less prone to problems. Therefore, you may end up in a situation where the curve is prone to those previously mentioned inflections or wrinkles, when upstream changes are made.

An example of this is when you have two open-ended pieces of geometry that need to be connected or bridged with a smooth blend. Your email address will not be published. Related Topics.

Posted by. Leave a Reply Cancel reply Your email address will not be published. I agree We are using cookies to give you the best experience on our website. By continuing to use the site, you agree to the use of cookies.

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