eye level horizon.

[Vay]

i read the andrew loomis book but i don't get how to draw in perspective to your eye or to a certain height.

If you want to draw to a perspective of a 6 foot guy, how do you do it?

[DeadlyFreeze]

Your drawing on a blank grid in xyz space. Size and depth only occur in correlation to other shapes.

[Vay]

Your drawing on a blank grid in xyz space. Size and depth only occur in correlation to other shapes.

I'm sorry can you clarify on that?

i think i get your point, but if i want to draw in perspective to a person who is 6 feet, how do i make sure the perspective grid is correct? do i move the horizon lower or higher to what degree?

for example, you can look at something at 100 feet tall, that means you are at a height of 100 feet and almost bird's eye view in contrast to a worm's eye view, so how do you make it so that you are a 6 feet?

OK.....

lets say i am in a city full of people and a person of 6 feet is standing in front of me and i am also 6 feet, does it matter if i am viewing him at a birds eye view or worm's eye view? it seems to me it does so i just want to know how do i make it so that i am the same height as that other guy.

quoted from andrew loomis' book ( i want to verify if this is true)
"when viewing from a height of 6 feet, 1/2 the vertical distance from the bottom of the person to the horizon will be 12 feet." In other words, half of the length from the bottom of the person to the horizon is the height of the person, if half of the height from the bottom of the person to the horizon is 14 feet, then the person is 7 feet. Is this true? how do i find the bottom of where i stand if i am the viewer?

I also thought about it and if a person who takes up from eye to feet the horizon to the ground, then you are the same height as him? In other words, the height from horizon to ground determines your height when established that from horizon to the ground is 6 feet? or in even simpler words, the horizon is the level you are viewing at? if it is so i am so late...

[Pencilcandy]

I'm sorry can you clarify on that?

i think i get your point, but if i want to draw in perspective to a person who is 6 feet, how do i make sure the perspective grid is correct? do i move the horizon lower or higher to what degree?

for example, you can look at something at 100 feet tall, that means you are at a height of 100 feet and almost bird's eye view in contrast to a worm's eye view, so how do you make it so that you are a 6 feet?

OK.....

lets say i am in a city full of people and a person of 6 feet is standing in front of me and i am also 6 feet, does it matter if i am viewing him at a birds eye view or worm's eye view? it seems to me it does so i just want to know how do i make it so that i am the same height as that other guy.

It does matter. What matters is how tall you are and what sort of perspective you are using. Is it one point, 2 point, 6 point?

If you're using 1 point, you want the vanishing point straight ahead.

If you move your head, your vanishing point usually moves too, since everything gets tighter and tighter in front of your eyes, until it converges into one little tiny dot.

Is this mathematically correct? Not at all, since every little combination of lightbeams creates a state whereby objects recede, so you would need thousands of vanishing points to make it right. Even computers have a hard time calculating so many points.

[DavePalumbo]

lets say i am in a city full of people and a person of 6 feet is standing in front of me and i am also 6 feet

excellent way to put this.

ok, so looking at another person of equal height to you standing at the same elevation (meaning, not uphill or anything), his eyes will be on the horizon line. Because his eyes are the same height from the ground as yours, they are going to intersect the horizon.

If you were to sit on the floor and your eyes were now at waist level, his waist would now intersect the horizon instead of his head.

Every other person in the scene will intersect the horizon exactly the same way, plus or minus given their individual proportions and height. If they all meet the horizon at roughly the same area of their bodies, their distance from you is understood by their size relationship to others

[Koji Bryant]

Three images to aid us in understanding the challenging topic of perspective.


When horizon is hi

http://www.jameslp.com/Blog/wp-content/uploads/2008/08/jlp_20080804_0540_blog.jpg


When horizon is low

http://z.about.com/d/cameras/1/5/q/5/beachTaylorFerreira.jpg



When you're looking at horizon

http://barfblog.foodsafety.ksu.edu/DogObedienceTraining.jpg

[Xeon_OND]

Three images to aid us in understanding the challenging topic of perspective.
When horizon is hi

http://www.jameslp.com/Blog/wp-content/uploads/2008/08/jlp_20080804_0540_blog.jpg


When horizon is low

http://z.about.com/d/cameras/1/5/q/5/beachTaylorFerreira.jpg


When you're looking at horizon

http://barfblog.foodsafety.ksu.edu/DogObedienceTraining.jpg
That's truly FTW, Koji!!!!!! LOL, the dog one really is awesome. :D

[MyOrangeHat]

excellent way to put this.

ok, so looking at another person of equal height to you standing at the same elevation (meaning, not uphill or anything), his eyes will be on the horizon line. Because his eyes are the same height from the ground as yours, they are going to intersect the horizon.

If you were to sit on the floor and your eyes were now at waist level, his waist would now intersect the horizon instead of his head.


Wow thank you! This had never made sense to me before. One more question as a follow up to that though. So if I sit on the ground and look straight ahead then his waist is eye level BUT what if I'm sitting on the ground and tilt my head up to make eye contact with the other person. Does that change the perspective and horizon line? I've never understood this. :\

[DavePalumbo]

it won't change their perspective as it relates to the horizon, just the framing of your image.

Imagine an invisible line that is connecting your eyeballs to the horizon. Wherever an object intersects this line is also the point which it will intersect the horizon from your vantage point. This line runs parallel to the surface which you are standing on, so if your eyes are 5 feet from the ground, this line will intersect every other object sharing your surface at 5 feet from the ground, follow? When you then tip your head backwards towards the sky, this line connecting your eye to the horizon still exists, even when you can no longer see the horizon.

If you want to demonstrate this, go outside and look at the horizon. Notice how objects appear to recede and think about the line from your eye to the horizon. Now simply make a frame with your hands to give you a viewing window, and tilt it upwards. Nothing in your environment changes, just the framing of it and how much you can see.