2016/09/17 by Alastair Toft, Toft, Alastair, Huw Bowles +3
Computer Science · #Computer Graphics and Visualization Techniques #Advanced Vision and Imaging #Image and Video Quality Assessment
paper · pdf · doi:10.48550/arxiv.1609.05344
Volumetric cloudscapes are prohibitively expensive to render in real time without extensive optimisations. Previous approaches render the clouds to an offscreen buffer at one quarter resolution and update a fraction of the pixels per frame, drawing the remaining pixels by temporal reprojection. We present an alternative approach, reducing the number of raymarching steps and adding a randomly jittered offset to the raymarch. We use an analytical integration technique to make results consistent with a lower number of raymarching steps. To remove noise from the resulting image we apply a temporal anti-aliasing implementation. The result is a technique producing visually similar results with 1/16 the number of steps.