They dedicate more processing power to lights that are brighter. The solution to this problem are the power and log power light strategies. The light strategy controls how much processing power is spent on each light in the scene.Īll lights in the scene can be sampled with the same probability ( uniform light strategy), but if some light sources are much brighter than others, the image will be more noisy because a lot of processing power is spent on weak lights that are not contributing much to the lighting. Raise the clamping value if this happens. Note that this cache may produce visible artifacts if aggressive (too low) clamping values are used. This cache makes direct light sampling in such situations much more efficient. a skyscraper with hundreds of rooms, each room lit by one light source). Direct Light Sampling Cache: Use this cache in scenes with many light sources, where most of the lights only affect a limited area around them (e.g.Do not use it in open scenes, as it can be detrimental to performance in that case. Environment light cache: Use this cache if direct light from world background is noisy (for example in indoor scenes lit by sky or HDRI through small windows).caustics in mirror, pool with camera above surface, underwater scene with caustics reflected from water surface, etc.) PhotonGI Caustics Cache: Use this cache if there are SDS-caustics in the scene (e.g.PhotonGI Indirect Light Cache: Use this cache if the indirect light in the scene is noisy (for example in indoor scenes).Caches can be saved to disk and re-used, which can for example be used for animations where only the camera moves. They can accelerate the rendering of their respective area of expertise tremendously. The clamping value has to be chosen to fit the brightness in the scene.Ĭaches are pre-computed before the rendering of film samples starts. In almost all cases, the Sobol sampler is better suited.Īll engines support "variance clamping" of samples. Supports adaptive sampling to spend more samples on noisy areas of the image. It is not recommended to use this sampler for rendering on GPUs. The main disadvantage, especially when rendering on the GPU, is the higher RAM usage than the other samplers. Metropolis: Sampler that spends more samples on bright areas of the image, thus rendering caustics much better than the other samplers.Sobol: Random sampler with an improved noise pattern.LuxCoreRender offers the following samplers: The sampler decides how points on the film are chosen (in which area to fire more/less light rays). It is recommended to combine this engine with the Metropolis sampler. Supports only a subset of AOVs: RGB, RGBA, ALPHA, DEPTH and SAMPLECOUNT. Bidir (CPU only): Bidirectional pathtracer that casts rays from both camera and light sources.When the last tile of a pass is reached, it is split among the compute devices. The OpenCL version adapts the number of tiles that are rendered at once to the performance of the compute devices (GPUs/CPUs), so the tile size does not matter a lot (if rendering performance is bad due to small tiles, the number of rendered tiles is increased automatically). Tiled Path (CPU/OpenCL): Unidirectional pathtracer that is almost the same as Path, but uses a special sampler which iterates over the image in tiles (this leads to a slightly lower RAM usage).Path (CPU/OpenCL): Unidirectional pathtracer that casts rays from the camera.LuxCoreRender offers the following engines (integrators): The choice of engine decides how lights are traced in the scene.
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