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Old 08-03-2014, 03:53 PM
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Re: Basic 101: Class 3 - Drawing Cubic Objects

Well done, Minna .
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Old 08-26-2014, 04:13 PM
meadowsweetmom meadowsweetmom is offline
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Re: Basic 101: Class 3 - Drawing Cubic Objects

Arnoud - Here are a couple drawings I did for Class 3 on cubic forms. They were way more challenging than I expected with so many cubes combined in one image! I had a bit of trouble with my roof lines working themselves back to horizontal even when I told them to slope to the VP.Also, making the windows in the same perspective and making them look realistic. I feel the wing to the right on the house still is not quite right, the perspective I mean. In the photo of the house the far right wall does not look vertical, though it does on my paper. (The house was not falling down!). Same thing with the far side walls of the barns. They were vertical on the paper, really! Also had some struggle figuring out how to do sloped roofs in perspective but I hope solved that.



I have a question about the method though. Reading de Reyna's book on this lesson he said "do not erase!!" when you are trying to find the right perspective lines. Can you explain why not? My attempts get so messy I can't tell which line I have decided upon. Also, I think I tend to go too quickly to detail and then have to backtrack when i suddenly notice something not right and then have to trace the details.... impatience!!
Any tips?

All input appreciated.
Thanks, Barb
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Old 08-27-2014, 04:23 AM
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Re: Basic 101: Class 3 - Drawing Cubic Objects

Barb - Very nice .
Quote:
In the photo of the house the far right wall does not look vertical, though it does on my paper. (The house was not falling down!). Same thing with the far side walls of the barns. They were vertical on the paper, really!
Remember the very first principle of perspective "Further away looks smaller" ?
Humans tend to compensate, a camera cannot. Take care to point the camera perpendicular to the paper.
Best practice is to use a tripod and the self timer. To get it completely correct, put a little mirror flat against the drawing. If the camera "sees" itself in the mirror, it is correctly aligned.


This is when I straightened the edges of the paper with the "perspective tool" in the drawing software:


Quote:
I have a question about the method though. Reading de Reyna's book on this lesson he said "do not erase!!"
That is a general principle when sketching. If you erase the wrong line, you're back at square one. The wrong lines will in fact guide you in finding the correct form. The knack is to start with very faint lines, strengthening only very gradually.
And yes, practice makes perfect .

You did very well in this class, please move on to class 4 .
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Old 10-14-2014, 12:50 AM
alexk3954 alexk3954 is online now
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Re: Basic 101: Class 3 - Drawing Cubic Objects

Here is the sketch I used as inspiration for this assignment:


I messed around for a while shading and blending and had a good time. At the end I decided I would try to draw some clouds in the sky, though the composition and execution were both poor.

To my (apparently untrained) eye, the perspective looked good until l I drew in the perspective lines !

I find it very difficult to make the lines converge all at the same point, especially when there are multiple walls that need to be kept in proportion. For a more serious piece I guess it would be almost necessary to use tracing paper and transfer the corrected rough image onto a clean sheet. Can anyone provide a good link for how this is done? Everything I see comes up with a technique that seems different from what is described in the class notes. If I just put charcoal on the backside of a tracing paper that has my image drawn on it, would that not get charcoal smudges all over the new piece of paper? I have absolutely no experience with these materials




I suppose it may have been best to go with a photo in correct proportion rather than some out of proportion sketch for this assignment. I am going to give the dice a try

Last edited by alexk3954 : 10-14-2014 at 01:08 AM.
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Old 10-14-2014, 05:05 PM
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Re: Basic 101: Class 3 - Drawing Cubic Objects

Alex - Nicely done .

I cannot see when you checked the perspective, but it is strongly recommended to do it on the basic skeleton, before adding details and rendering.
I like your rendering very much .

Transferring to the "good paper" can be done in many ways. A concise explanation is in the class on Colored Pencils.
An intermediate "tracing paper" is only needed if you want to preserve the "original", e.g. from a book. I wouldn't use charcoal, but the softest graphite pencil, and applying it only under the lines to be transferred, not on the whole page. But very often the good paper is not so opaque that you cannot trace on it directly, on a lighttable. Nothing expensive, it can be improvised easily, as here:



Or even simply a PC monitor, tilted for comfort, displaying a white page.
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Old 10-17-2014, 02:04 AM
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Re: Basic 101: Class 3 - Drawing Cubic Objects

Thanks for the advice and the link Arnoud!

I just finished with the die and was a little sad to see some errors in the completed project. I checked everything after the initial guiding lines were down. I guess I messed some lines up while I was shading. The two closest edges of the dice converge way too soon. Also the lines going backwards on the top of the right die somehow went from converging in the skeleton to diverging in the final product. I thought I was being careful too!

I didn't really notice how badly I mangled the proportions of the top of the right dice while shading. Now my eye is just stuck on it whenever I look at this picture, I see nothing else; it's funny how that works

Here it is:
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Old 10-17-2014, 04:26 PM
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Re: Basic 101: Class 3 - Drawing Cubic Objects

Good job, Alex .
Good for you to see the shortcomings, I have nothing to add .
Yes, we all have the tendency to start freewheeling when busy in a repetitive job like rendering ("shading"). It is a general advice to stop regularly, and take some distance - literally and figuratively - to observe where you are going.
You did very well, please move on to class 4 .
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Old 11-02-2014, 01:09 AM
mbrna mbrna is offline
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Re: Basic 101: Class 3 - Drawing Cubic Objects

Lesson 3 has proven to be a challenge for me. I've tried to draw the dice twice and still have issues. My first attempt is here, and I have added the checking lines at the end of the drawing. I can see the error on the blue lines, but my issue is more with the red and green lines.

Because the two dice are slightly rotated from each other, their top edges cannot be parallel lines. I mean, the top edges of one die are not parallel with the top edges of the other die. I believe this means the top edges of the two dice will have different VPs - but the rule is the two VPs must lie on the same horizontal line (same horizon).

I believe this means that the rate at which the green lines from the die on the left converge with each other, and the rate at which the green lines from the die on the right converge with each other - those two convergence rates are going to be different.

How do I make the green lines from the two different die converge properly with respect to the two dice?

The second drawing I have here is a barn that I drew from my mind. I had to correct the right side of the barn, as you might be able to see.



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Old 11-02-2014, 02:39 PM
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Re: Basic 101: Class 3 - Drawing Cubic Objects

Good job, Michael .
Quote:
I believe this means that the rate at which the green lines from the die on the left converge with each other, and the rate at which the green lines from the die on the right converge with each other - those two convergence rates are going to be different.

How do I make the green lines from the two different die converge properly with respect to the two dice?
Your assumption is correct . Now how to do it is fairly easy: you choose one VL and force the others to follow. Which one to choose? by judging how it "looks nice". And there is more than one solution.
Here is an example (my lines all in black).
Additionally I corrected two other - and in fact more serious - issues:
-- not enough "foreshortening", the top plane looked more a rectangle than a square. NO mathematics here, only "a good eye" .
-- the "red" VP of the left dice is too near to look good, it must converge less.



Very well done so far .
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Old 11-02-2014, 10:24 PM
mbrna mbrna is offline
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Re: Basic 101: Class 3 - Drawing Cubic Objects

Quote:
Originally Posted by arnoud3272
Good job, Michael.
Your assumption is correct . Now how to do it is fairly easy: you choose one VL and force the others to follow. Which one to choose? by judging how it "looks nice". And there is more than one solution.
Here is an example (my lines all in black).
Additionally I corrected two other - and in fact more serious - issues:
-- not enough "foreshortening", the top plane looked more a rectangle than a square. NO mathematics here, only "a good eye".
-- the "red" VP of the left dice is too near to look good, it must converge less.

Very well done so far .

Thanks!
Your explanation helps me to see that, shorter VLs have faster convergence.

i.e. As the right die is rotated say, clockwise, its right-most VP moves away from center. This causes the right-pointing VLs to get longer, and the VLs to converge more slowly. At the same time, its left-side VP moves toward center causing the left-pointing VLs to get shorter, making them converge faster.

So when drawing the left-pointing VLs of two dice sitting next to each other, the die that is rotated more clockwise will have shorter, faster converging, left-pointing VLs.
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Old 11-02-2014, 11:56 PM
mbrna mbrna is offline
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Re: Basic 101: Class 3 - Drawing Cubic Objects

Attempt number 3 at the dice, and an attempt at the building in the lesson plan. The dice are surely difficult, and the building isn't that easy. I am not sure how to draw white trees on a white paper. I guess I should draw everything that isn't a tree...foreign concept to my engineer's brain!



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Old 11-03-2014, 09:47 AM
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Re: Basic 101: Class 3 - Drawing Cubic Objects

Looks good, Michael .
Quote:
I am not sure how to draw white trees on a white paper.
This class concentrates on recognizing the cubic forms, so drawing the building is the essence for now. Besides, as a general principle, you don't draw some detail just "because it is there" (a dustbin in a streetview for instance )
Specifically on drawing white, in comics and other forms of illustration where outlines are customary there is no problem. For realistic drawing, observe how a large completely white shape is what you know, not what you see. There are a lot of shadows and reflections of neighbouring objects.
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