How to define a material like glass, steel, cloth etc. in drawing? How to give that effect?
Textures of materials are quite effective and important for better drawings. So I start with, hmmm…
Oscar goes to…
Glass is a transparent material, so we see what is behind that glass; the shadows inside the glass which the glass causes that shadows itself; partly and slightly the reflections of the environment around the glass on its transparent surface; sometimes refractions with an object behind the glass, sometimes without refractions. What do I mean with saying ‘refraction’? Grab a glass of water and put a spoon inside. You won’t be seeing the spoon straight. Well; this is glass and water together. Another example is glasses.
Prepare yourself with a paper and pencils; we are starting with two pieces of glass.
In here there are two glass pieces. One of them, the one under is slightly darker. I drew them so soft, even I raised the contrast on photoshop, still the lines are light.
In this step it is easier to see. I tried to show you the glass refraction with that navy guidelines.
The lilac surfaces don’t intersect the surface of the darker glass under. So these areas will be so light, so tranparent.
I want you to show you the red parts above. You may not have perfect smooth sections on a cut glass, there you will have some lighter or darker parts. You can see these red parts below better.
This is the final version without any guidelines or stains. Transparency, color of glass and refraction are what make sense in here.
Have you noticed that that refraction thing also happens in our photos with glasses. I have some scrawlings.
See how the glass of the glasses changes our vision. The first guy on the left up holds his glasses from some distance away from his face so in both glass parts we can see eyebrow, eye, little part of nose and the side of the head are seen in a smaller version. Yeah, glass in here made the vision smaller in the left and right frames over the eyes.
We see the guy on the right up with an angle. I want you to see the refraction because of the glasses on the left part of his head. It is a small change and doesn’t happen always but it is good to know. I think it is about the type of the glass; degree of its minus or plus number.
In the third one we see a drawn version of photobomber glasses, I drew it from a photo I like. The glass cuts a part from the other person’s eye within the glasses frame, the eye should be seen because of the transparency; but not the same as it is.
Here is steps of a glass drawing.
The first one is the main structure. There is a bottom thick part and ellipse part in the middle down there inside. Now imagine that ellipse has a depth, and is like a tiny cylinder actually.
In here you will understand better what I meant with saying “we see shadows inside the glass which the glass causes that shadows itself” on the third step.
When I finished the drawing, I used the eraser and deleted in a vertical way and in different sizes to show some light reflection on the surface.
Would you like to throw a small rock at a glass with me? YES? So grab one!
I made a higher contrast for these 2 pictures to be seen easier (On paper it looks more smooth than it is here).
First step is a flat light grey background.
For a cracked glass imagine a centre where the rock hit, draw a central part and then imagine how a rock makes water circles spread from the centre if falls; this time it is not circular but linear, they are smilar I think. You can even think as those centre and cracks like petals of a flower.
Now make those crack veins some deeper and some of them darker. There will be main cracks; longer and thicker and smaller cracks; shorter, thinner right at the centre. That is the first drawing on the left. Next step after this one is some more details, highlights and shadows.
Look at the texture in the centre; there is no rule about it, it is just natural shadows and highlights that happens because of the crack. That part even looks like a diamond, some.
Not every vein of crack is the same; some are deeper; some cracks have longer way to the bottom of the glass in the section -if you can imagine; and some cracks are just too short and they are on the surface; for every of these crack we will have their shadows.
This is the final version of the cracked glass.
In here I used kneaded eraser, I made a thin surface as much as possible and slowly deleted for the effect on the top surface of the glass in order to present cracks and scratches; and the darks near those highlights became those highlight parts’ shadows. Now I think you can understand why I made a flat grey background for the drawing in the very first step.
Actually you don’t have to do the highlights in the glass with this ‘background coloring’ way. You may use white pastel stick. I decided to use sketching pencils only (I spoke as if I have pastel sticks :D)