boulder pencilRocks are mutual elements in nearly every mural. On a large scale they are mountains, on a pocket-size-calibration they are the boulders or stones in a field. Getting comfortable with depicting rocks that show planes and structure volition help many of your drawings. Here are the key points for success.

  1. Learn to see planes, fifty-fifty rounded boulders accept planes.
  2. Show planes with shading line angle, shadows, and cracks.
  3. Utilise a uncomplicated value scale and run across the shapes in each zone.
  4. Await for and include the light and dark wedges (more on this below).
  5. Cracks volition change angles every bit they motility from one angle to another.
  6. Ground the rocks with dark shadows.

platonic solids shadowPlanes are the angled surfaces of a rock. If you want your stone to accept real volume, y'all need to see and show these planes. 1 mode of showing the planes is with a line on the edges between the planes. This tin can be unsatisfactory because at that place really are not lines there. Another manner to bear witness the planes is with shadow. The line betwixt light and shadow will fall at the edge of two planes and so showing this  shadow defines some of the planes of your rock. If a cast shadow falls across two planes, information technology will change its angle as it does.

edges contourYou can likewise signal the direction of a plane by the orientation of the shading lines beyond it. If your shading lines prove up in your final cartoon (instead of being blended together), you can employ this to your advantage. Orient your shading lines such that they prove the path that a raindrop on the rock would have across the surface (downwards) and horizontal for a flat surface. If the plane is not facing straight toward the viewer, down volition not exist vertical but at an angle. It tin can exist difficult to visualize how this works at first. A 3D model inscribed with vertical lines volition assistance you visualize these angles. Download and print out the dodecahedron model and assemble it. Observe how the down oriented lines change angles as you rotate the model. I put mine on the back of the toilet tank and looked at it daily for a calendar week until the angles became intuitive. Give it a try.

paltonic sectionsCracks and veins also assistance show the planes. The cracks change direction every time they pass onto some other plane. Await for cracks in your rock. Make certain they change angles forth with your shadows and shading lines.

Now lets accept a look at a pace by stride cartoon that incorporates these concepts and others to give the illusion of an athwart rock, emphasizing the planes and solidity.

boulder sbs 1bDepict the outlines of your rocks. I started with a stake non-photo bluish pencil to block in the basic shapes. If yous expect closely you lot can see information technology in the background. I too indicated the edges of the major shadows and planes.

boulder sbs 2

Side by side I drew the major shadows using lines to carve the planes of the rocks. For the purposes of this demonstration, I am making the  shading lines fairly bold. I unremarkably would handle information technology a little more than subtly. This is a piffling too prision bar stripey for my gustation- a jailhouse stone?

boulder sbs 3Now the dark and calorie-free wedges… Look along the edges of the shadows on (many) real rocks and yous will run across places where wedges of shadow intrude into the highlight and wedges of light creek into the night. Add together these to your shadow edge and the shape of the stone becomes much more interesting.

boulder sbs 4Now the fun part- cracks. If your boulder does not have cracks, just say no to crack. Just if you are lucky plenty to be drawing a rock that has been fractured, the cracks will dramatically help you lot show the planes of your rock. The angle of the crack should change each time it moves from one aeroplane to some other.

You volition notice dark divots in some of the places where two cracks come across. These accents, called snodgrassing by illustrators, requite a lot of depth to the rocks. They are like shooting fish in a barrel to brand. fill up in the tip of the narrowest section of rock with graphite. This small tip is more vulnerable to erosion, making it recede more chop-chop than the rest of the stone.

boulder sbs 7In this last step I accept modified three things. First I have added a little fleck of texture to the rock, especially in those areas where the shadow moves to highlight. In this region, low-cal glances across the face up of the rock, emphasizing the texture. In the centre of the highlight areas, the texture gets done out by directly light. To advise the texture, I make a combination of little scratches and dots. Second, I have deepened the shadows on the left side of the rocks to advise stronger sunlight. Terminal, I add shadows at the bases of the rocks to ground the rocks to the earth and requite them weight. Notation that the texture in the shadow suggests short grass.

In this drawing, I use a limited number of value (dark to light) steps. My poor brain tin can not keep runway of a 1000000 shades of gray. I usually can handle virtually four. Rather than worrying about blending subtle shades of gray, I concentrate on using my small-scale palette of grays carefully, making subtle value shifts as I motion from one plane to some other and carefully carving the shapes brand by highlight and shadow.

Start observing rocks around you. Try your hand at simple studies to carve the planes and give your rocks volume. The best way to learn how to draw rocks is to practise with existent rocks you detect around you. Also learn a picayune about geology and the history of the rocks you draw. They volition get even more wonderful to you.

boulder pencil 4