970bed62ab
Soft shadows are relatively expensive to filter. However, with the default blur factors, it's not needed to use too many samples (unless PCSS-like shadows are used with a large size). Textures and screen-space antialiasing can also be used to mask the noise pattern effectively. On a GeForce GTX 1080, going from Medium to Low for both shadow types saves 0.2-0.4 ms of GPU time per frame in 2560×1440 resolution. This can translate to significantly higher savings on lower-end GPUs. Given how the shader works, this improves rendering performance even if lights with shadows are never used. |
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