A question about perspective

#2

I’m not familiar with any easy solution.

On paper you could take another sheet of paper and put it next to your drawing and continue your horizon line onto that.

In photoshop you can make a perspective grid out of vector tools (spline tool, line tool, etc). I forget how you set the canvas so you can move it around freely inside the document window (pretty sure there is a way). But you can just zoom out far enough untill you find the scale you need. Generally in PS, if you’re not using CS2’s perspective tool, you want to use vectors to do your preliminary perspective grids.

I think generally what architects and stuff do is get all the perspective work done in a thumbnail sketch before starting the final drawing. that way they can crop it and still know exactly where the lines should fall off the page.

#3

you can do the following:
draw two lines on your sheet converging on your desired (e.g.) right vanishing point, which is way outside the right border of your sheet.
then draw two vertical lines on your sheet near the left and right border.
mark the intersections of the first two (perspective) lines with the two vertical lines.
now subdivide the part between intersections on both vertical lines into (e.g.) 10 equal lengths.
connect the respective ticks of the left and right vert. line.

now you should have a grid of perspective lines which would all converge on the right v.p. if extended.

was this understandable? if not, i’ll make a sketch

edit: the sketch has been added some posts down…

#4

not entirely, i will be much appreciated if u can make a sketch :slight_smile:

#5

I would like to see a sketch aswell.

#6

the best way is to make a small thumb nail sketch get all the perspective right on this one and then enlarge it and trace over it.

#7

now, the sketch. I know, it was quite late yesterday, and i was tired, so I think my clarity was lacking… :slight_smile:
I think everything should be clear now, i hope everything is clear now and DeviantArt allows permanent links to pics :thumbsup:
update: doesn’t seem to work so well with DA and hotlinks, if the pic is not there, please visit http://www.deviantart.com/deviation/30120552/
update 2: now i got it hosted on imageshack, so there shouldn’t be any probs anymore…

If any questions remain, ask!

#8

it won’t let me access the picture, it said its forbidden :frowning:

#9

Hopefully, this is a similiar idea,

#10

actually, the same :beer:

#11

It’s working now for me! Great idea!

Edit: Is there a way to determin the horizon line after you have laid down those perspective lines?

#12

I finally almost read a whole book about these things recently and will certainly have to reread some chapters and do some exercises to grasp it all, but as far as I understand, the horizon/eyelevel should be where the vanishing point is ?

#13

ThePhotographer: Yes, you’re right
Mike: Yes, by continuing the lines from your sheet till they intersect. Where they intersect, there’s the vp and horizon line. unfortunately, you would have to do that on your desk :sad:.
If this is not possible, afaik the best method is to make a rather small thumbnail first (like in my step 1), draw the horizon line and both vanishing points, and draw two perspective lines from each vp. Then you transfer these 4 lines onto your sheet, and consequently have the 4 lines necessary to make a grid for both vp’s.

#14

I have a related historical question. How old is drawing with perspective? I noticed that old paintings look rather flat. Who are the first artists using the vanishing point technique?

thanks in advance

Bob

#15

http://www.math.sunysb.edu/~tony/whatsnew/column/alberti-0102/alberti1.html

#16

thank you!

Bob

#17

Im glad this thread exists, thanks.

I too am learning more about perspectives. I am using basic CG primitives to find how I want things to look. Check out the Journey thread below, I have been givin some great advice and posted a lot. Cheers

#18

Here are few more links on the history on linear perspective.

Brunelleschi and the Origin of Linear Perspective
http://www.kap.pdx.edu/trow/winter01/perspective/

The Geometry of Perspective Drawing on the Computer
http://www.math.utah.edu/~treiberg/Perspect/Perspect.htm

Condensed version
http://www.mos.org/sln/Leonardo/ExploringLinearPerspective.html

#19

Sorry my english

To work with perspective I use these materials

  • Big Piece of foam
  • 5 or more pushpins
  • thread
  • clipboard
  • chalk any color, except white

I put an image that explain by itself the concept.

After that you have establish your perspective you only need to put chalk in the threads, connect the threads in the same position lift them a little and let fall the thread. Now the chalk will be in the paper with the perspective that you designed.

#20

I didn’t read through this whole thread, so maybe this has already been stated or is a liittle off from the original discussion, but I too am learning perspective, and while searching the internet I found that some (mostly bigger I think) universities have lots of resources available in their libraries. I am not a student at my local university ( University of Washington), but for a $100 donation to some university library foundation, I now have access to all the undergraduate libraries, including checking stuff out. And they have like a dozen different, sometimes specialized, libraries to choose from. Anyway, my point is that I was able to check out a series of 10 vhs videotapes on perspective that are intended for their architecture students, and they are really great and helpful, with more info than you will probably ever need. I also got a set of anatomy lectures by Robert Beverly Hale on tape. Definitely worth $100. Libraries Rule!

#21

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