Learn How to Digitally Paint Rock Textures!

Creating a knowledgeable foundation to paint rock textures is important for painting different styles of rock in your scenery. Rock itself is divided into three categories: igneous, sedimentary, and metamorphic.

Igneous rocks make up approximately 95% of the upper part of the Earth's crust and is formed by cooling magma. However, most of it is hidden by a thin but widespread layer of sedimentary and metamorphic rocks.

Sedimentary is the most common and is formed from the Earth's intense pressure acting on a geographical build up sediments. It creates a layered, band-type texture on the rocks.

Metamorphic rocks are formed when heated pressure is applied to an existing rock, whereby molecules are reformed into a different rock structure.

Regardless of the rock formation, most of them have four, but are not limited to, different types of textures. You will be painting these textures in your digital art program as a means to explore these textures in depth!

1. Hard edged rock textures

Perhaps one of the most popular types of rocks to be painted are ones with defined planes. It is popular due to its ease as all it requires is a hard edged brush and some imagination. First, start with any random shape.

On a new layer, I recommend using the lasso tool and create a random outline of the rock you want to fill in. Once that is done, use your digital art program to preserve the shape. For example, the 'preserve transparency' check box in Photoshop will allow you to protect the shape.

Once the shape has been preserved, begin to paint rock textures of random shapes using a digital chalk brush. At the same time, imagine how the light will hit the object. Use a little bit of creativity as you randomly add the various planes to the shape.

The key here is to do short, straight, and simple brush strokes. Make sure to use the pressure sensitivity options of your digital stylus as a means to create different levels of light. If you're wondering, crystals are painted the same way!

2. Soft edged rock textures

To paint rock textures with soft edged rocks, the concept is still the same. That is, you paint light on a darkened object to bring it to life. For this exercise, use an oval lasso and create random circular shapes and fill it in.

Once that is done, use the eraser tool to erase around the edges to create the dark background that you can paint the light in.

Now, you can stick with the chalk brush or use a smooth brush to paint in the light. I recommend the chalk brush for the edges and the smooth brush for the inner portions of the shape.

Instead of short straight brush strokes, do short circular brush strokes. Remember to keep in mind how the light will hit the object.

If you have painted too much light, go over the area again with black to enhance the shadows. This is useful for merging rocks together as light cannot penetrate these crevasses.

3. Spotted rock textures

Rocks that have been compressed by heat and pressure over time will show distinct spotted patterns. Limestone is one of these examples where you can clearly see sedimentary patterns. To paint rock textures of this pattern, you will need to play with your digital brush settings.

In other words, if your digital art program allows splattering or scattering to be turned on, now is the perfect time to use it! Otherwise, you can create a custom splatter brush. Usually, the type and size of the splatter will create different types of rocks.

One of the hardest things about painting these types of rocks is trying to emulate nature's random designs. Our minds tend to instinctively create identical patterns. If you see yourself doing this, step back a little, use the eraser tool, and begin to erase random areas where you think the shadows are.

Like always, work with light in mind as you begin to repaint your rock textures as required.

4. Striped rock textures

The last texture involves creating sedimentary layered rocks. Most of us have seen these types of rocks in fossil queries or on the sides of large mountains. Millions of years have exposed these layers above ground for us to have a better sense of the Earth's history.

As a digital painter, knowing this can help us create old valleys or mountain environments that have a sense of grandeur.

The best method is to paint rock textures of this kind is to paint hard edged rock textures first and then apply the stripes. The difficulty in these textures is consistency. Each stripe that you paint must be fairly consistent with the overall shape of the rock designed.

Also, make sure the angles are consistent. If you want, you can even add bits of spotted textures to create ancient limestone layers.

With this knowledge of the four main types of rock textures, see if you can combine them to create different textures. Later, you can also refine it and add color to the rocks. The bottom line is to practice and be persistent as you build a strong digital art foundation!

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