blender · HeyBraza shows you
why is my blender render grainy
HeyBraza points at the sampling panel, the denoise checkbox and the gpu setting so you stop guessing which one is causing the noise.
grain in a cycles render means the renderer ran out of samples before the image settled. raising samples is only one of three fixes - denoising and better lighting usually matter more, and cost far less render time.
short answer
raise 'max samples' under render properties > sampling and tick 'denoise'. dark scenes are the noisiest scenes, so brightening the lighting often does more than any sampling setting - and clamping indirect light to about 10 kills leftover fireflies.
or do it yourself
- 1open render properties (the camera icon) > 'sampling' > 'render' and raise 'max samples' - 128 is a sane start, 512 for glass or interiors.
- 2tick 'denoise' under the same sampling panel - it cleans up leftover speckle without adding render time.
- 3lower 'noise threshold' (e.g. 0.01) so blender keeps sampling the noisy areas instead of stopping early.
- 4make the scene brighter - bigger or stronger lights, or an hdri world - since dark scenes are the noisiest scenes.
- 5if single bright dots remain, open 'light paths' > 'clamping' and set 'indirect light' to about 10 to kill the fireflies.
steps last checked
let HeyBraza do this with you
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downloadcommon questions
does more samples always fix noise?
no - past a point it just costs time. denoising plus better lighting clears more grain than doubling samples.
why is my render slow as well as noisy?
blender may be rendering on the cpu - in edit > preferences > system pick your gpu, then set 'device' to 'gpu compute' in render properties.
