Why 3D Rendering Lighting is Crucial for Flawless Product and Architectural Visualization Companies

It’s easy to assume that your ability to create 3D models is the most important skill in product and architectural rendering. There’s indeed some truth to that because, after all, rendering just can’t happen if you don’t have the 3D models to begin with. But 3D modeling design services alone, no matter how accurate, don’t make a render photorealistic. Lighting does, at least when done properly by professionals, of course. And where do you find professionals to create flawless product and architectural renderings? Cad Crowd it is. As a freelancing platform specializing in product development and the AEC sectors, Cad Crowd has what it takes to connect you with the most talented and experienced render artists from around the world.

🚀 Table of contents

What can lighting do to your render?

The short answer is that good lighting makes a render look photorealistic and, therefore, believable. But the way it does exactly that is what makes the long answer worth a read.

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That thing called “vibe” is very real.

Some of you may not see the point of taking a selfie, but you’ve certainly tried to do it once or twice just because. And if you’re one of those people who are really into using the front camera anytime, anywhere, chances are you want to make the photos as flattering as they can get. I think it’s safe to say that lighting makes the difference between a good selfie you can brag about and a bad one you immediately send to trash. This is why you’re always looking around for the perfect spot under a bright light for optimal illumination, or wait until the warmth of the golden hour bathes the day for an outdoor selfie.

People intuitively understand that lighting affects the details, atmosphere, and vibe of an image; it doesn’t matter if they’re seasoned render artists or selfie enthusiasts. Bad lighting, whether because of awful weather or terrible positioning of an incandescent lamp, can make even a perfectly presentable object look noisy and rough. On the other hand, good lighting helps you highlight details, sometimes hide flaws, and make the image look professional.

The same rule applies to product and architectural rendering. When you see a rendering of a room or a car, for example, you’re not exactly thinking about the number of polygons used to create the models or if the composition is ideal for the image. Those are concerns reserved for the second glance. The first thing that comes to your mind is, “Does this image give off the right vibe?” How lighting is used in the image plays the most important factor in creating this vibe, or “nuance” in case you’re so inclined to speak fancy. 

Say you have two renderings of an SUV laid out in front of you. One render places the car on a rocky cliff with a strong sunset color across the backdrop, while another depicts the car on an empty, clean city street in broad daylight. Remember that both render the same exact car and point of view. It doesn’t take a modern art critic to know that the cliff render carries a message about the car’s ability to blast through difficult terrains, as if the render tells you that you’re looking at an off-road capable vehicle. It might be uncomfortable, like most true off-road cars are, but you’ll definitely get where you’re going, perhaps in some adventurous fashion that eventually comes to a satisfying end in the sunset.  The city street render, however, says nothing about ruggedness off the beaten tracks. The imagery even seems to imply a sense of cozy, relaxed, and mundane driving on a smooth road surface.

How does lighting fit into this, then? Lighting can accentuate the details you need to show. The sunset’s dark red and orange hues make for the perfect backdrop to showcase dirt and smudges on the car’s paint without ruining (much) its overall look. The car might be muddy and filthy, but it can withstand harsh environments just fine. If anything, the blend of sunset and dust reinforces the car’s hardy image. As for the other render, the message you get is a relaxed SUV, quite possibly the kind mainly driven from and to work every day, especially when it’s not raining. It might even look like an always-clean and shiny government vehicle, for that matter. Remember, they’re the same cars, only pictured with different backgrounds and lighting. The work of a skillful render artist is never just about making a product visible. It should focus on informing viewers about the product’s main selling points.

Don’t forget that vibes also trigger specific emotional responses, which are an essential target for great photorealistic rendering services. How you configure the lighting in a render draws viewers into an imagined scenario depicted in the image. When people see a render of the city street SUV, they don’t just go and wonder, “What if the road is slippery and there’s a traffic jam?” or think, “Ooo, I’d like to see if it can fit into the alley behind my house.” Well, some of you probably do wonder about such things, but in general, no. Most people immediately picture themselves driving the vehicle in the environment depicted in the visualization.

And the right lighting makes sure everything looks legit, as if they’re looking at a photograph. Even if the audience is well aware that it’s all CGI, good lighting lets them focus on the product and design rather than on how the image is rendered. The vibe of the imagery, made possible by the lighting configuration, enhances the realism effect. Bad lighting in a rendering makes the image look flat, and viewers can’t help but notice it’s just a fake; they won’t even bother taking a second glance, just pointing out where all the mistakes are.

You can also set a “mood” with lighting.

A light source, be it an incandescent bulb or the sun itself, doesn’t have emotional properties on its own. But when the light (should I say illumination?) is used among other objects in an image, it suddenly transforms into a powerful force that sets the mood. Some would go as far as suggesting that light is an emotional tool to provoke a response from the audience.

Let’s say you’re looking at a visualization of a new kitchen complete with pretty much all the present-day modern appliances like a smart refrigerator, a digital coffee machine, a shiny induction cooktop, an integrated dishwasher, a bunch of food processors, air fryers, multi-cookers, the lot. It even has an expensive-looking kitchen countertop with a mini bar to boot. Everything is there for you to impress your cool neighbors, if such people exist. The only thing wrong with the visualization is the lighting. Some appliances are clearly visible thanks to the bright overhead fluorescent lamp, while others are cast in deep shadows that seem to hide their polished finishes and sparkle. You can still make out the individual appliances, but the image doesn’t obviously highlight their features. In fact, no one will blame you for thinking that it’s a cafeteria in a hospital or something.

In another image, you see the same appliances in exactly the same spots. Only this time, the visualization is done by someone more skillful and experienced in product and 3D architectural rendering services. This person certainly knows their way around 3D modeling and rendering software, with a knack for artistic touch, too. You don’t see the overhead fluorescent anymore, and the overly bright LEDs attached to the walls are gone as well. Instead, you get the warm glow of natural sunlight through the clear glass window, added with some under-cabinet accent lamps. The design and layout are identical, but the lighting isn’t. And all of a sudden, the gloomy mood of a hospital cafeteria is nowhere to be found. What you have now is a sense of coziness wrapped in a breadth of luxury. It is in that moment that you realize how lighting can dramatically transform an interior rendering. 

In the world of product and architectural rendering, mood and vibe are important selling points. A rugged off-road car needs dramatic lighting that evokes the experience of an adventure in the wilderness, while a high-end kitchen can create a warm atmosphere that fosters comfort and relaxation. Every render artist knows that mood and vibe are intangible. They’re not something an artist can simply include or exclude from an image, but are real enough to define the look and feel of an image.

This is the main reason that lighting is likely the most complex and time-consuming part of a rendering workflow. It’s not just about how light hits an object. A render artist has to configure the number of light sources, their positions in the frame, light intensity, whether they are natural or artificial, reflective surfaces, translucent materials, and, of course, shadows. An artist also has to take color into account, as it can change depending on lighting conditions. It’s all about orchestrating the different lighting aspects in a render to make viewers feel a specific emotion. The lighting design expert must infuse the image with the right mood to convey the intended message.

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Let them have textures

A common sign of a bad rendering is that everything has a smooth surface texture. Sometimes, even human skin looks overly smooth, to the point that the image becomes unpleasant to look at. It simply is far from realistic or convincing, for that matter. It might not be a problem if the rendering shows a product with a smooth surface (like a chrome fixture, ceramic flooring, or jewelry), but for everything else, you need textures. Take, for example, an upholstered couch. Quite possibly one of the most common pieces of furniture used in an interior rendering, a couch isn’t supposed to be smooth. The upholstery can be made from natural or synthetic materials (or a combination of both), and none of them should look or feel smooth. Well, maybe some faux leather does feel smooth, but that would be a glaring exception.

Here’s another thing about a render: most rendering software comes with ready-made material and texture options. If the software doesn’t include a built-in texture file when you need one, it’s easy to find a matching sample or two online. If you’ve seen a render where paper is as smooth as glass, fabric looks like ceramic, and wood has a plastic shine, the problem isn’t from the lack of texture options. Incorrect texture is almost always a lighting problem, courtesy of a render artist who probably didn’t really pay attention during training.

Light, or more specifically, how light behaves when it hits an object, reveals the object’s surface texture. For example, you can tell whether an object is made of wood or fabric by how light interacts with it; you should also know whether a metal surface is brushed or polished by how it reflects light. This is also how a render should differentiate between translucent and opaque materials.

In an architectural rendering, proper lighting will reveal the rough texture of a concrete wall or the grains in a wood floor. You might argue that a wooden floor can be quite reflective depending on the finishes, but are you really sure that it should be as reflective as glass or polished stainless steel? Not to mention that not all wooden objects done by an interior rendering service have the same finishes. How do you then make a clear distinction between the wax-treated flat top surface of a desk and the painted legs, for example? Even if those parts receive the same illumination from a single source, light behaves differently when it strikes a different texture. And if you ask what happens if all the parts have the same finishes, well then, variation and creativity have a bleak future.

The same thing applies to product rendering, where proper lighting highlights material quality and texture. And if you really think about it, that’s what compels the manufacturer to have the product rendered in the first place. Say the product in question is a pair of eyeglasses. The render artist has to configure the lighting in such a way that it showcases the sharply defined angles of the frame while maintaining the refractive and reflective properties of the lenses. The frame can be made of plastic, brushed metal, polished stainless steel, or even wood, so the render artist has a challenging task to showcase the distinction in materials and textures. Things get more complicated when there are multiple products in a single scene. For instance, the visualization has to display a leather handbag right next to a metal ballpoint only when the lighting is properly set, so that the rendering captures the leather’s pores and bumps without ever hiding the metal’s shine.

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The bouncing of light

Back in the days when computers weren’t so fast, lighting in 3D rendering was mainly about pointing a source in the right direction. As long as the light illuminated the object, you could call it a job well done. These days, when CPUs and GPUs have become blisteringly speedy, the old method just won’t cut it anymore.

Render artists now find that if a visualization lacks something called Global Illumination (GI), it’s probably not worth a premium. And don’t worry, Global Illumination is nowhere as scary as it sounds. GI follows the basic principle of light behavior in the real world, in the sense that light doesn’t always simply stop when it hits an object. Light can bounce off a surface, penetrate through it, bend the trajectory, get reflected in specific or all directions, and so forth. It’s more commonly referred to as indirect illumination and arguably the single most important technical advancement in rendering tech and 3D visualization services.

GI is how you get “color bleeding,” which again, isn’t something you need to worry about. If anything, color bleeding does more to improve realism than you think. For example, in an interior rendering where you see a red rug in the corner, the lower section of the white wall appears pink. Now, most people would think that this is a mistake on the artist’s part, and the pink tint can be easily removed with a simple post-processing step. Yes, it’s correct, you can remove the pink tint, but no sane render artist would want to do it. The pink tint is intentional and actually a pretty big deal in the whole photorealism scheme.

The rug absorbs light, and that’s how you get to see the texture and perhaps the pattern as well as the color of its material. But not all of the illumination gets completely absorbed and vanishes; it’s an ordinary rug purchased from a hardware store, not a black hole. A portion of that light bounces off the rug’s surface and hits the lower section of the white wall, creating the pink tint. It’s the same reason why the underside of a table in a home office rendering isn’t completely dark. If it is, even a kid can tell the image is a fake. As a matter of fact, all architectural renderings would look fake without Global Illumination. Light bounces, travels, and behaves in all sorts of ways depending on the objects it hits. GI does all the heavy lifting to mimic the laws of physics.

Many modern rendering engines, such as V-Ray, Cycles, and Redshift, include a Global Illumination feature that simulates how light interacts with objects of varying materials, textures, and colors. While the software handles most indirect lighting calculations, you still have to manually configure the placement, intensity, brightness, and hues of the light sources. A good understanding of how light behaves and what it can do to an object/room is really what separates the pros from the amateurs. A true professional doesn’t just put the light in a certain position and flick the switch. They manage the reflections, the bounces, the refractions, and the bleeding of colors to create a natural-looking scene that appears realistic, the one thing your clients and audience are looking for.

In the absence of Global Illumination to improve the realism effect, all those expensive materials and intricate textures of your product won’t appear as obvious as your product design firm wants. Regardless of the product, proper GI makes the rendering look so real that you feel like you can touch it. 

An empty space is also an object

HDRI, short for high-dynamic-range imaging, is a render artist’s best friend in archviz (architectural visualization) to simulate real-world lighting. It gives you a realistic view of how objects, whether interior or exterior elements, should look under different lighting conditions.

There’s not really much of a big difference between 3D product rendering services and architectural rendering as far as lighting is concerned. You have the same goal in both, and that is showcasing objects’ materials, textures, patterns, and colors in a realistic way. But archviz is usually more challenging, especially if you have to work with a room or a structure that has a lot of space in it. You have to make use of those empty spaces, but this doesn’t mean you should fill the entire room with more objects.

Make the voids part of the scene, for example, by using them to define the boundaries of an open area or creating light paths. Let’s assume you’re working on a visualization of a dining area, which happens to be positioned in the kitchen without a clear physical divider. An easy way to set boundaries is to place a light source directly above the dining table. The resulting illumination should encircle a small area surrounding the table and set an imaginary yet visible divider.

Empty spaces are useful for setting light paths, too. In an interior rendering, it just doesn’t feel right when natural light (from windows or doors facing the exterior) uniformly illuminates the room. This is not how natural light works. Areas that aren’t positioned directly in front of the windows should appear darker than the rest. At the same time, it offers a good opportunity to create a visual hierarchy that subtly guides viewers to look at the first object. All of these can only happen if you have enough empty spaces and a good lighting setup. 

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Takeaway

Think of it this way: even in the real world, you don’t actually see objects. What you really see is light that bounces off those objects. As light bounces into your eyes, it carries information about shapes, sizes, colors, textures, and patterns to your brain. You’ve been subconsciously processing lights and shadows each time you open your eyes to look at things. 3D rendering is currently our best attempt to recreate the process on a computer using specialized software. Tools and technologies that mimic natural light behaviors have indeed become commonplace. Still, it takes a render artist with a good grasp of how light behaves in the real world to produce a high-quality render.

For more than 15 years, Cad Crowd has been a major hub connecting render artists and AEC professionals with clients of all backgrounds, from homeowners and small businesses to real estate agencies and major corporations. Whether you need a photorealistic rendering of a product or an architectural project of any level of complexity, you really can’t do much better than having Cad Crowd handle everything for you. Request a quote today.