Using of Special Line and Ray Lines in AutoCAD

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In the last video, we learned about text where we explored multiline text and single-line text.

In today’s video, we will learn about special lines, construction lines, and ray lines.

So come let us learn about these lines.

First of all, we will learn about special lines. So here in drawing, we have a tool available which is the SP line. I can select the SP line from here and draw or I can type SPL … and press enter. As soon as I press enter, I have to specify the first point here and as I keep selecting the points my line is drawn with it. Suppose this is my endpoint, I have to press enter here and as I press enter, my line is prepared here.

Why is it called a special line? Because if I have any requirement in my drawing that I want a line, and suppose I have a line here and one more line here and now I want a connecting line that should be curved, so for that curvature I can use SPL which is a special line and this is my first point and this is the second point. With this, you can insert any curve that you want. Then you can select this line and add a fit point here so I will select here and add a fit point. As you can see now I can easily modify the line as I want with the fit point. So I can set the curve according to my requirements.

So In my drawing, If I need a curve line between any 2 objects, I can easily draw that with the special line command. One more thing. If I want to add this curve line, I can add this too. How? So if I want to modify this line, I will click on the exact fit point and add a fit point or remove this fit point as well. So I have removed it now. I will select it again, so as I point my cursor or arrow on this point, I will get the option to add a fit point again. Okay. So if I add a fit point here, that point is added. Now if I want the point between these 2 points, I can click here and select add a fit point. Okay. So between any 2 points, if I want a fit point, I will have to place my cursor on the first point and I will add the fit point there, so according to my requirement either in the center or anywhere in between, I can add the fit point. Okay.

There is one more thing. If I do not want to add a fit point but I want to make some changes on this curve like increase or decrease it or bend it inside or outside. so when I click here, I can simply modify this with my mouse. Okay. So I can set the curve as I want according to my requirement. ok?

Are you getting it? (7 seconds gap)

One more thing. If I want to draw a special line, I have 2 options. So I will click on the draw and then a special line, here are 2 options, so the one we saw earlier was a fit point and now the second is control vertices.

As I click on control vertices, my lines will be drawn in this manner. Now let's see the difference here.

For that again I will type SPL and press enter.. and go to draw, special line and fit point and enter…

Don’t forget to press enter because if you don’t press enter, the line will not be drawn. For example, I will type SPL and enter, and here I am drawing a line and now if I don’t press enter, that line will disappear. So if I escape and come out of the command without pressing enter, then that line will be deleted. So let us see the difference. So I have made this line here with control vertices and this line with a fit point, so what is the difference between them? The difference is if I want to modify this line, I can easily and precisely modify it. And here when I modify it, it is with a reference of a fit point.

So this is the only difference. When I want any precise modification in my drawing or the special line with precision, at that time I will use the control vertices. And if I don’t want much modification and want to draw a simple line and do not want to make any major changes, at that time I can use the fit point. And here I can add or remove the fit points. ok?

One more thing, if I want to add a point between these 2 vertices, I will click on add vertex here. So here you can see I can modify this curve and this curve also very easily. Okay.

Now I want to take a point in between these 2 points, as I want to modify the curve that is between this point and this point here. Either I want to lower the curve length or stretch the curve outside. So now whatever changes I make will be according to this, but I do not want any changes in this portion of the line and I want to change here, so here I will select add vertex, as soon as I add, here a vertex is available. As you can see, I can precisely change or modify this line from this point. Okay. So this was a special line.

Now the next line is the construction line. So to draw the construction line we have a shortcut XL and enter. As soon as I type XL and enter, here at the bottom we have some options like horizontal, vertical, angle, bisect and offset. We will explore this too. But before that let's have a look at what a construction line is.

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We mostly use construction lines to draw plans or big layouts. So as soon as I enter the command construction line, I have to specify a point here. Suppose I am selecting this point, you can see that there is a line available to us which is an endless line which means this line will be drawn with infinitive length. So if I draw this line and either zoom out or zoom in, we will not be able to see the endpoints ever. Why? Because it is an endless line. Again I will click Z and enter and A and enter. Ok? Let's have one more look.

So I will type XL and enter which is a shortcut for the construction line and select this point here. Right now my ortho command is off, so I can draw the line at any angle which is an endless line. When I turn on the ortho mode, my line will be drawn either exactly horizontally or exactly vertically. So when I entered the XL command I also specified a point where the line will be drawn exactly from here and when I click up anywhere again, that will be my center point. This means that the lines from the center are limitless.

Right now ortho is on so, either a horizontal or vertical line will be drawn.

So let's see what options we have? So XL and enter and here you can see horizontal, vertical, angle, bisect and offset. So first of all let's look at horizontal So I will type H and enter, you can see a horizontal line here. All the lines will be drawn in the horizontal plane only and I can draw as many lines as I want.

So here all these lines are endless. Okay.

Suppose I want to draw vertical lines, so I will type XL and enter and then I will type V and enter. So here you can see that all the lines that I am drawing are In the vertical plane only. Okay. Let's have one more look.

So Z enter and A enter, this means I have the whole screen available. So again we will type XL and enter, then I will type V and enter, all the lines that I draw now will be in the vertical plane only and all the lines will be drawn endlessly why? Because this is a construction line . okay. So when we draw a construction line, the line will always be endless and wherever you click will be the center point. Okay. One more time, so XL and enter, and now I will select angle, so A and enter. Here I have to specify an angle, so I will take 45 here and enter. You can see here that my lines are exactly at 45° with the horizontal plane.

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In the next video, we will learn about multilines.

Thank you.