topic Re: Draw objects by coordinates in isometric drawing in AutoCAD Forum

Draw objects by coordinates in isometric drawing

Anonymous — Sun, 21 Oct 2018 12:08:46 GMT

Hello, I am trying to complete this isometric drawing

but I run into a problem where I have to draw the window. I want to do this by using relative coordinates from the RED marked spot, in order to put the first point on the GREEN marked spot and start drawing lines from here.

What I do is:

Line>FROM>then select the RED marked corner>@25,-15

but this does not work properly: the first point of line is placed like in an ordinary 2d drawing and not following the isoplane lines.

How could I make the point to be placed based on the isoplane?

Or is there another way to draw this?

I hope I explained my issue clearly.

Thank you for help.

Re: Draw objects by coordinates in isometric drawing

ChicagoLooper — Sun, 21 Oct 2018 12:27:22 GMT

You need to enter the correct isoplane, either top, right or left isoplane. You can use F5 to toggle from one isoplane to another.

Re: Draw objects by coordinates in isometric drawing

Anonymous — Sun, 21 Oct 2018 13:18:45 GMT

I have tried this with every isoplane, unsuccessfuly( first I select it, then apply other steps)

Should I change the isoplane for each coordinate (one for the x and another for the y) ?

Re: Draw objects by coordinates in isometric drawing

leeminardi — Sun, 21 Oct 2018 13:26:48 GMT

There are many ways to get to the point you specify. Here are three.

#1 Make sure dynmode = 0 then create a line from the red corner using osnap end and the following coordinates:

@Anonymous<30 [Enter] (since you are creating an isometric drawing principal line are at 30°)

@0,-15 [Enter]

you are now at your green circle. You can delete the first line when you are done.

#2 with dynmode = 1 create a line from the red corner using osnap end and the following coordinates:

25 (tab) 30 [Enter]

15 (tab) -90 [Enter]

#3 Turn on the isometric grid and snap (right-click the grid icon at the bottom of the screen) and set the value to 5 since most of your dimensions are a multiple of 5.

Also set the iso grid orientation to Isoplane Right then you can use the grid to quickly draw the lines that are parallel to the principal isomentric axes.

Re: Draw objects by coordinates in isometric drawing

Anonymous — Sun, 21 Oct 2018 19:09:26 GMT

Thank you. 1st point worked but the 2nd gives me issues..

Re: Draw objects by coordinates in isometric drawing

ChicagoLooper — Mon, 22 Oct 2018 15:44:05 GMT

Unfortunately, you are not drawing in 3-dimensions. Your drawing is orthographic, which is a 2-dimensional representation of a 3-dimensional object. If you rotate your house, and look at it from different angles, it will be flat as pancake, whereas if you had a 3-D object, you'd have length of house, width of house and height of house, or all 3 dimensions. You have to do it by 'distance' not by coordinates. If your drawing were in true 3-D, then you could use the coordinates, that is, if you first establish an appropriate UCS for each face.

More than one option was suggestion by @leeminardi to do this, you should use one of them (or try all three for a more thorough understanding of the various workflows).