Perspective Drawing

[gwpriester]

Yes, Larry, thanks. But I am waiting to hear what Perspective has to say. Your two photographic examples are really more appropriate for two point perspective, and for that type of perspective there is also an area of accuracy in the middle before things start to distort.

[Rik]

It's great that you guys are enjoying your conversations, but the OP seems to have vanished.
I'm not sure whether it's into the 2nd or the 3rd point.

I just draw, and when I get stuck, I ask you guys!

[gwpriester]

Quite possible no point. A drive-by posting?

[Soquili]

The profile shows the OP visited the forum about 4 hours after making the post. Probably thought no one was interested when there were not reply during that time span.

[gwpriester]

Here's an example I was expecting to see from the phantom perspective person http://ariches.edu.glogster.com/3-point-buildings/

[wizard509]

Yes, Larry, thanks. But I am waiting to hear what Perspective has to say. Your two photographic examples are really more appropriate for two point perspective, and for that type of perspective there is also an area of accuracy in the middle before things start to distort.

Yes indeed Gary they are 2 point perspectives, as was most of what I did. There is a cone of vision that if you stay in there is minimal to no apparent distortion. I posted a tool to show that, and selecting the view as well as now to feature, in other words what you feel you are looking at. Admittedly those were all hand done and that seems to be the what I understand. When it comes to computer perspective drawing I am more or less at a loss.

[Albacore]

Used to have to teach this in Graphic Communication in schools in Scotland and it is all about "measured perspective" so if you want more info do a google search on subject. Have placed a PP presentation in a which gives a minimal explanation of what to do but it is very simple. Sorry file was too large will try and make it smaller, did it as PDF.

The place where I go to for reference on this subject and it has been referred to so many times is here: http://www.automotiveillustrations.c...rspective.html

[gwpriester]

That's pretty cool Pete, and the PDF works fine.

Anybody interested in the basics of perspective should check this out.

[perspective]

Hi gwpriester, to determine the area of accuracy of any perspective be it 2 or 3 point perspective you are talking about the Cone of Vision. This can only be achieved by being the correct distance from the subject. When it comes to 3 point it means you are actually drawing something that is over 6 feet in size to make it worthwhile using 3 points.

The technical aspect of this is too longwinded to explain here but the distance from the object is what you are aiming for. The main reason for your concern is to eliminate distortion. And thank you Soquili, you were right, you guys are great. And gwpriester, I am still here if you need to go further.

The reason I am new to this forum is because I have just installed Claroline and I am not sure if I can ask for help here. The problem is when I test with a student login all my images are missing and the right frame inside the course is not working correctly, it repeats the heading information in that frame also, what could be wrong. Yet in Admin mode it all works fine. I have searched the forum and cannot find an answer.

[perspective]

Hi gwpriester, the video in your first post link shows a guy creating 3 buildings using the third vinishing point, it's wrong. You cannot have 3 diffrent vanishing points at the top without changing the 2 vanishing points on the horizonal line. you will note that the buildings look distorted from each other.

The reason for this is the vanashing points on the horzon line are always 90 degrees to each other and this also determine the viewer's line of sight. If the vanashing point moves, the viewer moves his/her eye. Don't forget you can have as many vanishing points as you wish but all vanishing points must work with each other. What he has done is to create a building at an angle, the leaning tower of Pisa.

Notice the first building and second building are touching each other at the bottom yet you have a big gap at the top of each building. The angle at the bottom is changed, not the perspective view.