How many times do you adjust the light in your scene? And how often do you have to replace an object before you define the right position? Several times…

It wouldn’t be a problem if the results would be immediate, but unluckily with the most common renders it’s not like that.

Why does my image get noisy?

After every change of the scene, the image always gets noisy and you have to wait before the changes are accepted by the software.

The reason is easy: most of the renders are based on CPU and GPU technology and in order to support every single simple change, even a detail, they need time to proceed it.

CPUs and GPUs have a lot in common, even if they have different architectures and are built for different purposes.

GPUs were originally designed to accelerate the rendering of 3D graphics. Over time, they became more flexible and programmable, enhancing their capabilities. This allowed graphics programmers to create more interesting visual effects and realistic scenes with advanced lighting and shadowing techniques. But time is still an issue.

Comparing U-Render Realtime Rendering with GPU Rendering

Is there any solution?

Of course! It’s called realtime rendering.

Real time rendering is pretty much exactly what it sounds like: scenes are rendered so quickly they appear to be generated in absolute real time. This is measured in frames produced per second. This technology gives you the ability to see what the final result will look like right away. Even special effects like clouds, fog and depth-of-field can be viewed instantly rather than waiting for a lengthy rendering process. Amazing, isn’t it?

Rendertypes CPU, GPU and Realtime Rendering

In order to reduce the annoying problem of noise in the images, most of the renders have developed denoising filters, that can help, but it’s not an effective solution.

Keep on reading this article to know why.

Noise-free real time rendering vs. denoising filters

The reason why we can call real time rendering “noise-free” is so far clear. So let’s see a bit more in depth what a denoiser is and what it can do.

Based on Deep Neural Networks, the denoiser usually detects areas where there is noise in the rendered image and smooths them out.

Noise-free Realtime Rendering Can you read me Examples

By definition, a denoised image is never quite going to be precise. The denoising filters give you the best guess for what it thinks the final image should be. Details can be lost during the denoising process.

Here you find 6 good reasons to prefer a noise-free real time render, like U-Render:

#1: Saving time

The true real time rendering engine solves the issue of the time without a doubt, because you don’t need to wait for your final outcome. This incredible advantage results in having more time for you and for your side projects.

#2: No interruptions to your creativity

From the beginning of our journey it has been one of our main goals to assure a linear noise-free workflow.

#3: Endless possibilities

It can sound hard to believe but you can change every type of detail in every moment you need. Even during a meeting directly in front of a client, with your notebook. Noise-free means that: You can adapt your scene every time and everywhere.

#4: Accuracy

You can reach an accurate result with real time rendering because it doesn’t produce noise to smooth and so that all the specifications of the scenes remain untouched. Denoised images are an approximation.

#5: Reflection and refraction

Through reflections and refraction, some details may be visible, but by default the denoising filters ignore these elements and it often happens that details are lost in these areas. In real time rendering, there is no risk to lose details in the process.

#6: Animations

Images and animations are completely noise-free in real time rendering, without limitations or performance lacks.

Comparing Scenes With and Without Denoiser


Lots of people are used to render in interactive mode to update shaders and lighting and see the results update themselves interactively. But the issue is always that, based on the nature of progressive path tracing, the image gets noisy. Denoising filters are just a way to reduce the issue, but if you look for a solution, you should think to avoid completely the cause of the noise. Real time rendering technology incentives your creativity with immediate feedback to your changes.

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