API Reference > imodeljs-common > DisplayStyles > AmbientOcclusion > AmbientOcclusion.Props > blurSigma blurSigma blurSigma: undefined | number If defined, blurSigma is used to compute the weight of a Gaussian filter. The equation is exp((-0.5 * blurDelta * blurDelta) / (blurSigma * blurSigma)). If undefined, blurSigma defaults to 2.0. Defined in core/common/src/AmbientOcclusion.ts Line 30 Last Updated: 15 June, 2021