Sphere-iously

Drawing Homework Due 10/26/16

Happy Friday, my effervescent drawing students! As you know, we are entering the wonderful world of value in ART104. Hooray!

hooray

If anyone is interested, here is the presentation (in PDF format) that I gave on Wednesday, October 19 on the formal element of value: The Value of Value

Annddd… below is your friendly neighborhood reminder of what you need to complete and bring to our next class.


number-one-Finish Your Value Scale!

If you didn’t get it done in class, complete your value scale of ten 1″ x 3″ bars representing a range from 1 (white) to 10 (black) . Render this in conté crayon (what some of you know as “Blick sticks”). You can also use a kneaded eraser to knock back values if they get a little too dark. Be as neat as possible and create an even progression so that your scale can be effectively used as a guide. The final product should look something like this:
value_scale


TwoDraw a Sphere!

Draw it from your imagination but shade realistically in a full range of values using conté crayon or vine charcoal. You may work in your creativity journal or on a separate piece of paper. For the purposes of this exercise, assume you are rendering a white sphere on a white surface.

hmmIdeally, rendering the sphere is no problem, because you paid attention during the demo and maybe even took some of those helpful things… what are they called? Oh yeah… notes.

In case you were just too burned out after critique to register what we covered, however, here is a step-by-step demo to ensure everyone is on the same page with regard to this important process.

Using Value to Build the Form of an Imagined Sphere

  1. Sketch the box in which your sphere will sit and lightly inscribe a circle within it. It can sometimes help to knock the corners off the box and then refine the resulting octogon into a circle (see image under Step 2).

  2. Indicate the direction of your light source. I did my demo with a imagined light above and to the left at about a 45° angle.
    sphere1


  3. terminatorWhen it’s lit by a single light source, a sphere will have a dark side and a light side (just like the moon). Sketch a light line  perpendicular to the direction of the light to indicate the separation between the two sides (see image under step 2). Some artists call this the terminator, not because it looks like evil robot Arnold Schwarzenegger, but because it marks an ending to the light (which I guess IS kind of the same as evil robot Arnold Schwarzenegger).

  4. The direction of the light will also affect the placement and shape of the cast shadow. The cast shadow is on the  surface on which sphere rests and is caused by the sphere blocking light. One way to estimate how far this shadow extends is to draw lines parallel to the direction of the light, intersecting with the ends of the terminator on down to the resting surface (see image under Step 2).

  5. Refine the terminator into an ellipse by marking the poles: the points where the terminator crosses the edge of the circle. If we imagine the terminator ellipse as being inside a box—which of course is how we’ve drawn ellipses so far—the poles are equivalent to two midpoints. The belly of the ellipse for this particular sphere rounds down into the shadow side. It looks similar to a rubber band around a ball.
    sphere2


  6. Fill in a dark middle value to define the form shadow—the shadow on the object—as well as the cast shadow. Both shadows should be around a 6 or 7 according to your value scale.
    sphere3


  7. There are two main values in the light half of the sphere. FIRST is the highlight, which represents the point where the light source strikes and is the brightest area in the drawing. SECOND is the light middle tone, which for this particular imaginary sphere will probably average around a 3 on your value scale. Roughly block these two values into your sphere.
    sphere4


  8. There are three main values in the form shadow.. FIRST is the shadow edge or core shadow, which is usually next to the terminator. The core shadow is the darkest apparent value on the sphere and will probably be in the 8–9 range.  SECOND is a dark middle tone (the 7ish value you blocked in Step 6) which composes most of the rest of the form shadow. THIRD is the area of reflected light, which is bounced back from the resting surface and hits the sphere on or near the edge opposite the light source. Since our surface is white, this reflection will be lighter than the surrounding shadows.
    reminder_coyoteREMEMBER: all values on the light side will be lighter than any value on the dark side. The human eye can play tricks, making you think that the reflected light, for example, is as light as the light side values. However, it’s not true for examples like ours with a single light source.


  9.  Block in the the cast shadow, which will also have three parts. FIRST: directly under the sphere and will be a 9 or even a 10. SECOND: the shadow will fade to something akin to the dark middle tone of our form shadow (7ish). THIRD: toward the edge of the cast shadow, the value will be a light dark tone in the range of a 5 or 6.

  10. Refine your range of values, erasing, blending and adding darkness where necessary so you get a gradual fade. If you like, add a mid value in the background to set off the sphere and make it feel more like a real object sitting in space.
    sphere5

number3Do the Handout!

Of course, smooth shading isn’t the only way to establish value. You can also use repeated lines or dots to simulate a full range. This method relies on visual blending, which is what happens when your eyes automatically average closely placed blacks and whites so they appear gray.

To practice creating value with lines and dots, complete the worksheet you were given in class. Read the brief description of each technique, and then shade the circles accordingly. Your goal is to recreate the light and shadow the example sphere. FYI: you will have an easier time doing this worksheet if you have already done a blended sphere.



And finally…

reminder_spiderman

Don’t don’t DON’T forget… in addition to homework, your creativity journals are due for midterm review next class. Make sure you pack yours so you can get credit for your work so far!

Please also bring back any conté crayons, charcoal or erasers you borrowed to do your homework.

See you Wednesday!

 

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