Win32, OpenGL and ODE Physics

FreeWorld Tutorial

By Alan Baylis 21/07/2003

Build Lines

You might have noticed that the yellow lines crossing the center of the grid turn red as the mouse moves over them, these yellow lines are called build lines and allow you to set the third coordinate when creating a brush in an orthogonal window. By left clicking and holding the button down you can drag these lines within the orthogonal windows. They are necessary when more than one orthogonal window is open for the same view, if you had two front windows open in different positions on the Y axis and you were creating a brush in the top window then it becomes unclear where on the Y axis the brush should be created. The brushes could have been created at the origin by default but that involves moving the brush to its final position after it is created, with the build lines you can set the third coordinate exactly when building in the orthogonal windows. So if you are creating a brush in the top window you would first position the horizontal Y axis build line in the front or left windows, or if you are creating a brush in the left window you would first position the vertical X axis build line in the front or top windows. They are also used to position the brush when pasting a copied brush. If the view in an orthogonal window moves so that the build lines are outside of that view then the build lines will float at the edge of the window to make selecting them easier.