Rhino, Chinese name rhinoceros, contains all the NURBS modeling functions. When modeling with it, it will feel very smooth, so people often use it to model, and then export high-precision models to other 3D software. It is not difficult to use Rhino software, and you can learn it without foundation at all. "Basic Modeling Course of Rhino Industrial Design" is specially designed for Xiaobai students. Starting from the basics, there are intermediate modeling and advanced modeling courses. After learning this course, you can use Rhino modeling independently.

Hand chamfering technology of rhinoceros's three-sided chamfering

In the case of chamfering three sides, Rhino native chamfering tool is always not ideal. The latest version of Rhino7 improves the algorithm. Trilateral chamfering can be used to derive a larger radius, but it is still not flexible to use it manually.

Then how to solve this problem?

The idea is to extract the edge line to make a circular tube and then cut it, and then make the transition surface of three faces.

The difficulty lies in how to make the transition surface. If we analyze the characteristics of the transition surface, we will find that this is only a three-pipe mixed connection.

(Is the intermediate transition surface particularly like a three-pipe hybrid connection? )

In fact, the three-tube mixed connection method = hexagonal method should be equivalent. No matter how many faces there are, the first principle of cutting and mashup matching is to make four faces, because in Rhino's Nurbs surface world, all four faces are original, and all faces are cut and sewn like clothes on the basis of four faces.

Next, let's talk about specific practices:

Simplify the problem, that is, the following situation, and carry out G2 continuous chamfering.

① extracting the edge line dupedge

(2) Multi-pipe and multi-pipe connection (note that yesterday it was Pipe, and here it is multipipe, which is a new function of rhino7).

③ Generate intersection.

④ Cutting and pruning

⑤ Let the middle be close to the regular hexagon. It's a little slender in three directions. First, cut off a part to make a mixed surface, leaving six more positive surfaces in the middle. So you can do this first: trim the splitedge or extract the center line, here I choose to extract the center line, and then do curve fusion to get the following picture.

After making edgesrf with three slender directions, the surface G2 is matched with both sides respectively. Of course, you can also choose the splitedge method and use blendsrf directly. Adjust the method according to the situation. After completing this step, the following figure appears:

(Sky mode is used for rendering, so it is convenient to see the smoothness of the surface. )

⑥ Complete the middle hexagon, that is, use the three-tube mixed connection mode:

(1) First, the two tubes are mixed, and then the obtained surface matches the edge of the continuous large surface G2.

(2) Make a cutting line (the principle of drawing a cutting line is to make the angle of the new four sides as large as possible, not too sharp)

(3) Make four sides after cutting (note that the edge line is best extracted and reconstructed into a 5-order 6-point surface, which is the simplest surface for subsequent matching).

(4) Matching work, four sides are matched once (last trimming)

After matching, check the quality problems such as continuity:

(If the requirements for fairing are high, you can adjust the control points of the double-tube mixed surface with historical records. )

Let's take a look at the effect derived from the improved algorithm in the latest version of Rhino7 (7.5): it is already very strong, which was irreversible before.

The content of rhinoceros manual chamfering skills three-sided chamfering is shared here. I hope the above content can help you. If you want to know more about Rhino software, you can click this link: