Four ways to draw an arc

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National Taiwan University의 강좌에서

3D CAD Fundamental

47개의 평가

National Taiwan University

3D CAD Fundamental

47개의 평가

There have many three-dimensional shape of the object in your brain that are wanted to share, but do not know how to express? How to "sketch" the three-dimensional image in your mind? 3D modeling technology can help us construct the most intuitive and understandable three-dimensional model. The use of floor plan interpret the three-dimensional object process－the most direct and effective expression of our ideas. We have designed many paradigms so that people can quickly understand the logic of using 3D CAD software Sketchup and drawing skills, from introduction to advanced, and introduce SketchUp 3D modeling technologies. After completing "3D CAD Fundamental", it is no longer difficult to draw ideas that are beyond imagination with 3D modeling technology! The goal of this course is to construct a three-dimensional model, with the computer as the main teaching material, to enrich the fun paradigm and the complete drawing process. Step-by-step teach you how to use Sketchup's 3D modeling software technology. With the completion of "3D CAD Fundamental", you will be able to realize the 3D objects that exist in the imagination through 3D modeling!

수업에서

Toy House: familiar with [Move] and [Arcs]

The second example, toy house is designed for learners to be familiar with [Move] and [Arcs]. Inclined roof is a highlight in the example. Learners will understand how to add objects not perpendicular to the reference surface. The module also includes the methods of using [Arcs].

Match the slope of an inclined surface2:45

Four ways to draw an arc4:42

Make objects towards three axises by arrow keys2:18

강사 만나기

康仕仲
原臺灣大學土木工程學系教授 (Professor)
土木工程學系 (Department of Civil Engineering)

Greetings all. In this class,

we will learn how to draw arcs by using the sketch your arcs tool.

Joining arc is something very basic and important.

Because of this, there are different ways to draw them. Let's get started.

Sketch your arc provides four ways to join an arc.

The first method is called arc.

The main points of these methods is to

determine where the circle center of the arc will be.

We should know that as quarter of a circle can be drawn from a square.

So how to do this by using these methods?

First we draw a square.

Then we select arc,

click on the vertex of the square and then the other vertex.

Now we can see an arc has been created.

We saw radius measuring the same as the square side.

Now, we select another vertex to end the arc.

The second method is two point arc.

This method is simpler then the first one.

With just two points to be the end point of the arc.

The curvature of the arc varies with the movement of our mouse.

To finalize the arc,

we click one more time.

The third method is three point arc.

As the name it shows the method requires us to choose three points to determine the arc.

The first two points determine the rough arc form and the third point

gives the exact length that can be set by typing into the measurement box if needed.

Also, we should note that the method is use for irregularly shaped figures.

To demonstrate this, we will use the section poor objects.

We select the three point arc,

then we choose star points on the figure.

Now, the second point which the arc must go

through and hoover mouse to the points that most face with the figure.

When we are sure about it,

click on that points to enjoin of the arc.

And then we draw the next arcs.

The process is equal to the first one,

which was a start point on the figure.Now the second point which the arc must go

through and then we hoover mouse to the points that fits most with the figure.

We repeat the same steps mentioned above every time we are drawing new arcs.

Now we have finished tracing.

We double click on the figure we have just drawn and move it aside.

Here's another useful tips for us.

When zooming in, we can see the arcs of the figure are formed by lines.

If we want to create a smoother arc,

we could just right click on the arc and go to entity info.

Where is this place?

The details of the selected arc.

We can see there's a box showing segments

which indicates a number of segments after selecting arc.

Now we change the number to 100 and press enter.

We can see that the arc obviously is smoother than it was before.

If we want to create a figures with smooth margin,

don't forget this useful trick.

The last method is the pie method.

This method is similar to arc to method.

The difference is that,

the pie method is used to draw a sector of the circle.

For instance, we choose a point to start input

20 into the measurement box and press enter.

Next we input 30 into the measurement box and press enter.

Here, we get a sector with a radius of 20 and angle 30 degrees.

In today's class, we learned different ways to draw an arc.

Most of them need to establish the center and the radius to draw the complete arc.

The length of the arc will depend on our input.

That could be done in the measurement box or by using the mouse.

Also, one of these methods allows us to draw a pie.

Let's stop learning for now.

Goodbye.

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