In the attached .gif video (below, click on the thumbnail to start the non-audio video; alternatively, right-click on it and select "Open in New Tab", so that to ensure you are seeing the full view-- if your screen is smaller than the video's), I attempt to show using Relative Coordinates mode to draw a Roof. I used the 6000x6000x2000 Walls size you previously described Don.
>Workplane is the plain old "Workplane by World".
>At the start of the video, the Relative Coordinates Origin is at the World (Absolute) Coordinates 0,0,0.
>We move to an Isometric SW view.
>I relocate the Relative Coordinates Origin to the bottom/left Wall outside corner-- the SouthWest bottom corner of the Walls.
>I activate the Roof Tool.
>With the Running Snap "Vertex" active, I hover my cursor over that bottom/left vertex. The Coordinate Fields show X=0,Y=0,Z=0. I Shift+Tab into those fields and enter X=0,Y=0,Z=2000 (Tabbing from the X, to the Y, then the Z fields).
>I am going to specify the remaining three of the Roof points in a clockwise direction.
>With the first Roof point specified, I move my cursor to the NorthWest vertex of the Walls (this is not necessary, but I am trying to keep closely to what the author had done in the tutorial exercise you posted; I could just leave my hand off the mouse and Shift+Tab to get into the Coordinate Fields); Shift+Tab into the Coordinate Fields and enter X=0,Y=6000,Z=2000.
>I move the cursor to the NorthEast vertex of the Walls (again... not necessary); Shift+Tab into the Coordinate Fields and enter X=6000,Y=6000,Z=2000.
>I move the cursor to the SouthEast vertex of the walls; Shift+Tab into the Coordinate Fields and enter X=6000,Y=0,Z=2000.
>I click "Finish" (inserting Roof)
>I activate Hidden Line Render
>I click on the Camera Target=Drawing Center command
>Dynamic Examine around a bit
Unlike what the tutorial author specified, I did not use "Extended Ortho" nor "Always show Auxiliary Lines". I do not believe this to be necessary; and would have just cluttered up the video I was trying to make. Plus, using these Drawing Aids are not my personal preference/habit.
For Don and others reading: Reminder-- This is not meant to be an example of a good, quick, easy way of inserting a Roof. It's meant to be an example of using the Relative Coordinates mode.
« Last Edit: December 23, 2017, 06:04:00 PM by Alvin Gregorio »
(mostly Residential Architectural 2D; no formal CAD Training; intermittent TurboCAD user since yr. 2000 [ver6.5])
---TurboCAD: V20.2PP(57.0)[as of 3/12/15]; V19DL(54.2); V11.2Pro; Windows-7-Pro/64-bit; Intel-Core-i3 CPU; 2.27ghz; 4GB RAM; Intel HD Graphics (CPU based)