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To find out what an expert had to say about computer rendering and what to make of these real-life visual examples that resemble such renderings, Bored Panda reached out to Arnas Gaudutis, a 3D lighting and rendering artist with 15 years of experience in the 3D graphics field, working on various projects from game art to film VFX and product rendering.
“Computer rendering usually is described as image synthesis, it's a process of generating an image from a 2D or 3D model by means of a computer program. Synonyms of render can be paint, draw, portray, reproduce,” Arnas explained.
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He added that computer renders usually strive for photorealism, to simulate real world light and physics, and it's a really complex thing to compute for a machine. “Whereas in photography, a camera accumulates all light (photons) through the lens and burns into film or sensor by pressing a button. In a virtual 3D program, it's usually vice versa, all pixels of an image are generated through a virtual camera, where rays are shot from the camera, to get pixel properties—color, light, shadow, reflections, etc…”
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Turns out that this way, “pixel by pixel (millions of them), an image is generated by a program, where the user defines its settings and creates objects, light and materials. These days, 3D programs and render engines are quite advanced compared to 10-15 years ago. They have technology that effectively simulates light and other complex real-world phenomena.”
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Contrary to what many believe, “Bad computer rendering usually is caused by the user, not the program, either from lack of experience or artistic eye,” Arnas explained. “You can make things look bad even with the most powerful programs. For example, a professional photographer can take amazing photos using his senses and knowledge of composition, while another person with the same camera and lenses can pick wrong angles or a bad camera setting can take horrible photos—you can't blame the camera.”
The rendering artist continued: “Same is with computer programs—decisions made in a creative process are the ones that make computer rendering bad or good. There are areas where some technological limitations can be the cause of a bad-looking render, or by time needed to achieve the perfect result being cut. So it's a combination of both user and program errors.”
There’s this peculiar effect that bad rendering creates in images. “From an artistic point of view, bad composition or sense of lighting and material definition of objects in computer-generated images are the most common.”
“For example, the human face or eyes are the hardest thing to generate by means of a 3D computer program. There comes the term 'uncanny valley'—where even with the most advanced technologies, the generated image does not 'cut' the feeling that something is wrong or unrealistic,” Arnas said.
“From a technical standpoint, effects are,” he continued, “noisy images, jagged edges, or some other rendering errors that can happen during the process of generating the image, that give a feeling that it's not real or computer generated.”
Arnas reminded us that in the computer world, everything is way too perfect, like smooth surfaces, razor-sharp edges, evenly spaced objects and so on, and thus, it can result in unrealistic rendering effects. Meanwhile, in the real world, nothing is perfect, he said. Things like “dust, scratches, deformed lines and shapes can be barely noticeable to the eye, but it gives the sense of reality.”
It turns out that imperfections make things realistic. “Computer rendering strives for photography or real-life effects, where commercial photography sometimes strives for the super clean surfaces, reflections or other effects like in computer-generated images,” Arnas explained.
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When asked what he thinks of photos called ‘real-life bad rendering artifacts,’ Arnas said that it's either artistic choice or an undesirable effect that can happen due to human error. “Most of them are artistic choices, some of them being at the right time or place, picking the right angle or setting, you can capture strange-looking real life phenomena,” he said.