All of the technology in the world will not help you generate photorealistic photography if you do not adhere to some fundamental rules. And, while 3D software has made significant advances in photorealism, it will only get you eighty percent of the way there. The remaining 20% is the difference between an image that appears “sorta” real and one that truly convinces.

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For both the maker and the consumer

If you’re a 3D artist, you’re aware that many parts of a scene must come together to create a genuinely photoreal image.

It becomes a little more difficult if you’ve commissioned 3D work and believe it’s just not up to par. What exactly isn’t working? Trying to isolate the source of the problem can be both difficult and time-consuming. This list is intended for both creators and consumers of 3D imagery. Use it as a guide while you examine your work, and you’ll avoid some typical blunders.

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The good news is that improving your quality levels is as simple as making a few observations. Following these simple rules will go a long way toward assisting you in achieving spectacular results.

1. Let us now discuss sharp edges.

Computers excel at precision. The real world is flawed.

This is especially true around the margins of objects. Any 3D package can be used to create a mathematically perfect cube. Every surface will be at a perfect 90-degree angle. All of the edges are completely aligned.

Perfectly sharp edges are frequently unnatural and unattractive to the eye.

Real-world items do not have flawless mathematical properties. It is physically impossible for two surfaces to meet at exact right angles and retain their sharpness. If you look at the intersection of any two planes, you will notice rounding, damage, and unevenness.

Rounded edges are more natural and add visual appeal.

Examine the items around you and note the many edge attributes that occur.

This natural (or artificial) rounding is critical in achieving visual accuracy. Why? Because these edges frequently produce highlights. And it is these highlights that provide as important visual clues. They aid in the definition of planes, the division of surfaces, the addition of volume, and the creation of visual interest.

Make sure to apply bevels to even the sharpest of corners to create a small radius. This is especially critical if your objects and surfaces are going to be seen up close.

The issue with CAD data

We deal with a lot of CAD design data at The Image Faculty. This is frequently devoid of fillets and radii. At render time, most render engines have a feature that creates the impression of a rounded edge. This can save a significant amount of time by significantly increasing realism without the need for additional modelling.

Take note of the sharp edges on this CAD data.

The same CAD data as before, but with a round edge shader applied.

You may take it a step further by incorporating slight damage into an edge. Popular render engines like Arnold and Vray have their own methods for accomplishing this.

Pay attention to the details. Always pay attention to your edges and incorporate rounding.

2. Take note of the shadows.

3D artists frequently disregard the type of shadow and, in particular, the edge quality of a shadow. With such a diverse selection of CG lights at one’s disposal, it’s simple to create a decision that defies reality.

It is important to note that these concepts apply to both pre-rendered and real-time lighting circumstances. However, because to technical constraints of realtime engines, the user may not have access to the same lighting options or amount of control.

Razor-sharp edges are a common indication of a CG light source. Shadows with no gradient or change in tone are another dead giveaway.

These shadows are more reminiscent of a flash than of sunlight.

Shadows in real life are rarely sharp. The softer the edge of a shadow, the further distant it is from the item throwing the shadow. As a shadow moves away from a surface, it is frequently partially illuminated by the ambient light. This will have an effect on the colour and intensity. In general, the intensity of a shadow (its darkness) decreases with distance from the item throwing the shadow.

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The variation in edge sharpness suggests a distant light source, suitable for sunlight.

So, how can you prevent making these common mistakes? To begin with, some of the responsibility can be placed at the feet of history. Because of earlier legacy concerns, most 3D packages provide sorts of lights that simply do not exist in the real world.

Stay away from these light sources.

These are two light sources that we strongly advise you to avoid or use with extreme caution.

Point lights, also known as Omni lights, emanate light in all directions from a non-physical point in space. As a result, they can create not just false lighting effects, but also unappealing shadows.

Ambient light – this light source or render option has the aesthetic impact of elevating your image’s darks and midtones. Its purpose is to create the illusion of more light bouncing about the picture. However, this frequently results in a desaturated, washed-out appearance. Increase the amount of global illumination bounces or add extra lights to the area.

Maintain your grounding in reality.

These light kinds are more reflective of what we see in real life. As a result, they produce more credible results right away.

Area lights are light-emitting surfaces. Similar to a real-world window or a photographic soft-box. Natural-looking shadows with soft edges and realistic fall-off are produced by area light sources. They also benefit from being visible on reflecting surfaces. This is a common desirable effect that will help to create realism.

Dome lights and skylights are devices that replicate enormous light sources such as the sky. When combined with High Dynamic Range Images (image-based lighting), they introduce a global light source that contributes significantly to the creation of realistic lighting situations. This is a wonderful place to start because it allows you to take the lighting (and hence the shadow quality) in whichever direction you want.

Keep in mind the simple rule that large light sources, such as area lights and dome lights, will cast soft shadows. Sharper shadows are produced by smaller light sources, such as spotlights.

By paying attention to reality and making good lighting choices, you can improve the realism of your shadows and increase the believability of your photos.

3. Including a dash of craziness

Your 3D programme generates absolutely flat surfaces in the same way that it generates the ideal 3D cube. These are the adversaries of realism. Even though the surfaces in our scenario are quite clean, such as smooth painted interior walls, we need to add imperfection to them.

Surfaces that appear reasonably clean and unweathered retain visual interest. This could be because of illumination, dirt and scuff marks, or uneven surfaces that catch highlight and self-shadow.

Make a commotion

The goal of the game is to add slight imperfection to your surfaces quickly and efficiently. This is most simply accomplished by employing noise patterns. They are a versatile approach to break up a homogeneous surface when used as a color/tone map or a bump map.

Your preferred render engine will provide noise patterns that can be used in a variety of ways. Try incorporating noise into your diffuse colour or texture. Change the scale so that the effect is not immediately visible. The goal here is to break up the surface gently so that there are no broad patches of flat colour or tone. If your wall is lit from a glancing angle, using a noise as a bump will cause undulations on the surface. This will give modest depth and interest by introducing shadow and highlight.

The surface looks fantastic with a straight shader applied to the wall.

A modest, detailed bump is used to increase realism.

A larger bump is combined, which breaks up the highlights and lends scale to what is otherwise a huge surface.

A representation of the greater hump. It’s worth noting that it’s scaled in Y to provide some directionality.

It’s simple.

You want to “feel” this effect rather than see it. As a result, while adding noise patterns, be careful not to overdo the impact. Push it to the point where the pattern becomes visible, then reduce it by 20%.

It will astound you how much of a difference this subtle but significant improvement can make in the realism of your photographs, particularly interior situations with enormous flat surfaces.