Andrew Loomis Successful Drawing Question..

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  05 May 2009
Question Andrew Loomis Successful Drawing Question..


I'm currently going through Andrew Loomis' Successful Drawing, and have reached the section on scaling in perspective (pages 48-52), and I don't really understand it's purpose,
nor how to really do it. It compounds in that he doesn't explain it as much as would seem necessary.. Can someone explain it to me?


Sergeant Oreo

Last edited by Bmac : 05 May 2009 at 06:09 AM.
  05 May 2009
Looks like it's for when you want to create a room or object to scale. Using the knowledge that the horizon level = eye/camera height, you know that it's that same height vertically to any point on the ground plane. You can use that to mark off distances horizontally and vertically. Then you also pick a depth to match that, and mark "equal" distances towards the horizion, using the method on page 42.
  05 May 2009
Thanks for replying velenosangue.

Edit: What exactly do you mean by picking a matching depth?

Last edited by Bmac : 05 May 2009 at 03:25 AM.
  05 May 2009
Hi SergeantOreo,
Depending on the field of view (FOV) used in an image, depth cam be more compressed or less compressed. This is why people look weird when they get too close to a webcam, or when you see them through the lens of a door's peephole (wide FOV). Likewise, it's common for studios to use telephoto lenses to take fairly flattened shots of people and products (small FOV).

Here are some example shots I've rendered out of the same room with different lenses. The grid on the floor/walls is perfectly square.

Last edited by SmallPoly : 05 May 2009 at 10:15 PM.
  05 May 2009

Ah, I get it now.. I went over the technique last night with someone and now
it all really makes sense. Diagonals are really useful!

Thanks again for helping me! ^^
  05 May 2009
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