Re: US Gypsum in On3 scale - the Western Hoppers 1-20

Yeah, I'm going by the tooltip labels that OpenSCAD brings up when you hover the mouse over the respective buttons, circled in red on each screenshot. "Perspective", and "Orthogonal", they are...

The point is, for anyone reading that wants to understand what's going on without a refresher course in geometry: in a three-dimensional view on a computer screen drawing the lines straight like you think they should be doesn't look right, you expect depth lines to be conveyed by their convergence on a point on the horizon. So, a "perspective" render draws them on the screen so they converge on the horizon point. For two-dimensional points of view, like what you expect in a drawing, the rendering has to take place differently to get rid of the "depth" lines.