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Old 07-16-2014, 11:06 AM
sarajane554 sarajane554 is offline
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Re: Basics 101: Class 2 - Foundation of Perspective

Originally Posted by Pirou
More perspective questions.

Okay, I have been examining the diagram that is supposed to go with Exercise 3, which is Figure D. This shows a cube with only one vanishing point, but more than 1 facet of the cube is visible. This should be drawn in 2-point perspective. If we were to stand this object up, it would not be square, and it would fall over.

The same situation is shown in the accompanying guest lecture which describes one point perspective as "all vertical lines are perpendicular...all horizontal lines are parallel, and...all diagonal lines intersect at the point on the horizon..." That is not correct. The lines described as horizontal would only be horizontal if the front facet were directly facing the viewer and was parallel to the viewer. As soon as the cube moves to the side or rotates so that more than one facet is seen, it becomes two-point perspective, as each of those facets is going to have its own vanishing point. Otherwise, it's not a square object. I think these descriptions and drawings are confusing to a learner. Can these posts be changed? I think they are presenting erroneous information.

Sorry for interjecting, but I had the same thought process that you expressed above when I was thinking about 1pp versus 2pp. But I do believe the posts you refer to are correct: If one of the cube's faces is directly facing the viewer (even if it is off to the side, not directly in front of the viewer) then it's 1pp. If one the the cube's edges is directly facing the viewer, then it is 2pp. And if one of the cube's corners is directly facing the viewer, then it's 3pp. Arnoud, is this way of thinking about the issue correct? Or maybe you can correct us both :-) Thanks.
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