Amostragem
Reference
- Panel
O integrador é o algoritmo de renderização usado para calcular a iluminação. Cycles atualmente suporta integrador de traçado de caminho com amostragem de luz direta. Isso funciona bem para várias configurações de luz, mas não é adequado para cáustica e algumas outras situações complexas de iluminação.
Rays are traced from the camera into the scene, bouncing around until they find a light source such as a light, an object emitting light, or the world background. To find lights and surfaces emitting light, both indirect light sampling (letting the ray follow the surface BSDF) and direct light sampling (picking a light source and tracing a ray towards it) are used.
- Viewport Samples
Number of samples for viewport rendering. Setting this value to zero enables indefinite sampling of the viewport.
- Render Samples
Número de caminhos para traçar para cada pixel na renderização final. A medida que mais amostras são tomadas, a solução torna-se menos ruidosa e mais precisa.
- Time Limit
Renders scene until time limit or sample count is reached. When the time is set to 0, the sample count is used to determine when the render stops.
Nota
The time limit does not include pre-render processing time, only render time.
Adaptive Sampling
With adaptive sampling Cycles automatically reduces the number of samples in areas that have little noise, for faster rendering and more even noise distribution. For example hair on a character may need many samples, but the background may need very few.
With adaptive sampling it is also possible to render images with a target amount of noise. This is done by settings the Noise Threshold, typical values are in the range from 0.1 to 0.001. Then render samples can then be set to a high value, and the renderer will automatically choose the appropriate amount of samples.
- Noise Threshold
The error threshold to decide whether to continue sampling a pixel or not. Typical values are in the range from 0.1 to 0.001, with lower values meaning less noise. Setting it to exactly 0 lets Cycles guess an automatic value for it based on the total sample count.
- Min Samples
The minimum number of samples a pixel receives before adaptive sampling is applied. When set to 0 (default), it is automatically set to a value determined by the Noise Threshold.
Redução de ruídos
Denoising removes noise while previewing scenes in Rendered mode in the 3D Viewport or for final renders.
- Render
Denoising for the final render can be enabled or disabled with the checkbox. For denoising the image after rendering with the Denoising node, the Data Render Passes also adapt to the selected denoiser.
- Open Image Denoise
Uses Intel’s Open Image Denoise, an AI denoiser which runs on the CPU.
- OptiX
Uses an artificial intelligence algorithm to remove noise from renders. It is based on the OptiX – NVIDIA acceleration engine and therefore has the same GPU requirements as rendering with Optix.
- Porta de visão
Denoising for the Rendered mode in the 3D Viewport can be enabled or disabled for with the checkbox.
- Automático
Uses the faster available denoiser for 3D Viewport rendering (OptiX if available, otherwise OpenImageDenoise).
- OpenImageDenoise
Uses Intel’s Open Image Denoise, an AI denoiser which runs on the CPU.
- OptiX
Uses an artificial intelligence algorithm to remove noise from renders. It is based on the OptiX – NVIDIA acceleration engine and therefore has the same GPU requirements as rendering with Optix.
- Start Sample
Sample to start denoising in the 3D Viewport.
- Input Passes
Controls which Render Pass the denoiser should use as input, which can have different effects on the denoised image. Generally, the more passes the denoiser has to denoise the better the result. It is recommended to at least use Albedo as None can blur out details, especially at lower sample counts.
- None
Denoises the image using color data.
- Albedo
Denoises the image using color and albedo data.
- Albedo + Normal
Denoises the image using color, albedo, and normal pass data.
- Prefilter
Controls whether or not prefiltering is applied to Input Passes for use when denoising. Visible only when using OpenImageDenoise.
- None
Does not apply any prefiltering to the input passes. This option retains the most detail and is the fastest, but assumes the input passes are noise free which may require a high sample count. If the input passes aren’t noise free, then noise will remain in the image after denoising.
- Rápida
Assumes the input passes are not noise free, yet does not apply prefiltering to the input passes. This option is faster than Accurate but produces a blurrier result.
- Accurate
Prefilters the input passes before denoising to reduce noise. This option usually produces more detailed results than Fast with increased processing time.
Avançado
- Semente
Valor de semente do integrador para obter diferentes padrões de ruído.
- Use Animated Seed (clock icon)
Changes the seed for each frame. It is a good idea to enable this when rendering animations because a varying noise pattern is less noticeable.
- Padrão
Random sampling pattern used by the integrator. When Adaptive Sampling is enabled, Progressive Multi-Jitter is always used instead of Sobol.
- Sobol
Usa um padrão Sobol para decidir o padrão de amostragem usado pelo integrador. Veja`Sequência Sobol <https://en.wikipedia.org/wiki/Sobol_sequence>`__ no Wikipedia para mais informações.
- Progressive Multi-Jitter
Uses a progressive multi-jitter pattern to decide the random sampling pattern used by the integrator. Its advantage is to provide a well distribution of samples over iterating sample counts. Because of its good distribution over a range of different sample counts, this sample pattern is used for Adaptive Sampling. See this Pixar paper for more information.
- Sample Offset
The number of samples to skip when starting render. This can be used to distribute a render across multiple computers then combine the images with bpy.ops.cycles.merge_images
- Scrambling Distance Multiplier
Lower values Reduce randomization between pixels to improve GPU rendering performance, at the cost of possible rendering artifacts if set too low.
- Automático
Uses a formula to adapt the scrambling distance strength based on the sample count.
- Porta de visão
Uses the Scrambling Distance value for the viewport rendering. This will make the rendering faster but may cause flickering.
- Min Light Bounces
Número mínimo de rebatimentos de luz para cada caminhos, depois do qual o integrador usa Roleta Russa para terminar caminhos que contribuem menos para a imagem. Definir um valor alto resulta em menos ruído, mas pode também aumentar o tempo de renderização consideravelmente. Para um número baixo de rebatimentos, é altamente recomendável definir esse valor igual ao número máximo de rebatimentos.
- Min Transparent Bounces
Minimum number of transparent bounces. Setting this higher reduces noise in the first bounces, but can also be less efficient for more complex geometry like hair and volumes.
- Light Threshold
Termina probabilisticamente amostras de luz quando a contribuição de luz é menor que o valor desse ajuste (mais ruído mas renderização mais rápida). Zero desabilita o teste e nunca ignora luzes. Isso é útil porquê em cenas grandes com muitas fontes de luz, algumas podem contribuir com uma quantidade pequena na imagem final, e aumentar o tempo de renderização. Usando essa opção pode diminuir o tempo de renderização necessário para calcular os raios que no final têm efeito muito pequeno na imagem.
- Amostras de camada
Quando camadas de renderização possuem número de amostras por camada definido, essa opção especifica como usá-las.
- Use
As amostras das camadas de renderização irão sobrepor as definições de amostras da cena.
- Envolto
Vincula as amostras das camadas de renderização às amostras da cena.
- Ignorar
Ignora as definições de amostras por camada de renderização.