Subtle high-frequency noise is normal for the Corona renderer, especially at the beginning of the rendering process, where bright noise and dark noise are unavoidable. To eliminate them, only increasing the number of photons, increasing the subdivision value of materials and lights, and spending a lot of time can be eliminated.
So how to eliminate it? One way is to increase the hardware speed, replace the CPU, increase the memory, etc., which is undoubtedly an increase in cost; another way, relying on software to improve the algorithm, cleverly eliminate noise, both noise reduction technology.
The concept
The denoising feature was introduced in Corona 1.4, a feature that analyzes noise in 3D space and subtly reduces noise while not producing spots, maintaining sharp edges and texture details. This not only improves quality, but also reduces rendering time by 50% to 70%.
How to use denoising?
1. Enable denoising. You can enable denoising in "Render Settings - General Settings - Denoising". Denoising options include:
Denoising Mode:
Only Remove Firelies;
Full Denoising;
Gather Data For Later; For example, make a scene that uses Corona's own sky, sun and camera objects. The window object PORT seals the window outside, using Portal Matrial. Then, open the Render Settings panel and set the Denoising Mode to Full Denoising. Sstart the VFB rendering window, click to render. This is a screenshot of PASSES TATAL = 4, there is a lot of noise in the scene. PASSES TATAL =25
This is a screenshot of 25, and there is a lot less noise in the scene. My machine used 126 seconds, this speed depends on your CPU core and clock speed. The better the hardware, the faster the speed. Click to pause the rendering and start the denoising program. Comparing the upper and lower two figures, the noise is removed a lot, but the scene is a bit black. Go to the POST panel of the VFB window, adjust the exposure and highlight limit, and adjust the correct exposure. The current level of denoising is 0.65 by default. Manually adjust the noise reduction to a level of 1, to see if the noise reduction is more.
The model material 16 points PASSES TATAL=10 . A lot of noise After noise reduction processing.
Official Demo
Rendering ten minutes DOF, depth of field demonstration The denoising function is turned off, we can see a lot of noise in the photo.
After the denoising function is turned on, no noise.
Denoising radius test: Denoise radius: 1 Denoise amount: 1, the image is very clear, the details are many. Denoise radius: 4 Denoise amount: 1, The noise is reduced, the image becomes blurred, and the detail is reduced.
Use the Corona renderer in C4D after opening the render settings panel -- enabling FULL DENOISING. If you use the VFB window to render, then when you manually stop, the denoising function will start automatically. If you use an interactive render window, then when you manually pause, the denoising program will not start.

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