Nowadays, the 3D CG production process is more and more complicated, involving more and more software and plug-ins. Film production requires a lot of time in the rendering step. Even though the render farm has powerful hardware, I can still hear some people complaining: why the rendering speed is so slow , and why the rendering time is so long?
Since the rendering is done by dividing the screen, the complexity, lighting, and detail textures that need to be colored in different blocks are different, so the rendering speed will be very different. Today we will analyze, in addition to the hardware problems, what’s the factors that will affect the length of the cloud rendering time.
In general, these factors can be divided into two categories: the factors in making the rendering file and the renderer.
The factors that make the file
Model face, material, light, hair, rendering settings.
1. Model factors:
Models include polygons, fluids, etc., and the rendering speed will drop dramatically when the total amount of models is too large. This problem can be said to be "hardware damage." Sometimes due to design needs, complex models cannot be avoided. Therefore, such objects can only be seen in the camera's field of view as little as possible by reasonably adjusting the angle of the camera. Of course, this depends on whether the object is the subject of the user's performance. 2. Material
The effect of the material is generally divided into two parts: the texture type of different materials and the precision of the texture.
In order to get real rendering results, each texture's texture contains Color Map highlights, reflection maps, bump maps, displacement maps, and more. Different materials have a great impact on rendering speed.
The 3D model of the movie must be more accurate than the animated character. The more accurate the model, the more the number of faces, the higher the fineness, the more the number of textures needed. And the texture may be expanded from 1024 to 2048, or even larger, which undoubtedly adds difficulty to rendering. 3. Lighting
Unreasonable use of lighting, excessive use of light sampling parameters and quantity will increase rendering time. The intensity and amount of light also affects rendering speed.
It should be noted that this problem exists not only in the light intensity, but also in the rendering engine (secondary bounce) intensity and (skylight) illumination intensity. And the higher the subdivision value, the slower the speed, but the shadow effect is more delicate.
Floodlights are now more frequently used. They calculate many unwanted shadows, so their resource usage is very large. Unless it is necessary, try to minimize its use and use spotlights instead.   4. Hair
Hair rendering has always been a big problem in the CG industry. To get realistic hair effects, rendering speed is definitely time consuming. Even if the hair just adds reflection, slow reflection and highlights, its rendering speed is almost twice the time of the model. If you add transparency to the hair, the rendering time will be doubled. Even Hollywood's top animation studios, such as the Blue Sky or Pixar, are as optimized as possible for hair problems. 5. Rendering settings
In rendering settings, the concept of anti-aliased sampling refers to an algorithm for sampling and filtering, and produces the final set of pixels to complete the rendering of the image. Strictly speaking, no matter which sampling method is used, the rendering time is increased, so consider For different situations, using different rendering resolutions for different scenes is one of the most important rendering settings.
And in order to avoid repeated rendering, it is usually done first test rendering. The larger the image size, the better the quality and the slower the speed, so it is necessary to set the image size according to the size of the 3D scene. Renderer factor
Different software uses different renderers and there are differences in rendering time. The Arnold effect is the most stable, but the speed of rendering transparent objects in glass is simply crashing. Octane is also a GPU-based renderer, and if a slightly larger scene is solved with PL, the efficiency will drop.
Although the V-Ray renderer is stable, there are too many setting parameters, especially in terms of material adjustment and lighting performance, which makes the rendering speed slow overall.
Because many factors will affect the speed of rendering, so whether in the production or before the rendering settings, we must optimize.

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