SDFs are computed on the GPU using a jump flood algorithm ( https://www.comp.nus.edu.sg/~tants/jfa/i3d06.pdf https://www.comp.nus.edu.sg/~tants/jfa/i3d06.pdf )

SDFs are computed on the GPU using a jump flood algorithm ( https://www.comp.nus.edu.sg/~tants/jfa/i3d06.pdf https://www.comp.nus.edu.sg/~tants/jfa/i3d06.pdf ) from a series of voxels, storing color at each point. From this, a regular grid of probes are placed and integrated using the data from the SDF, using ray-marching. Material shading reads from the probes.