Qbism

Paint a 32-pixel icon in black and four grays. Qbism extrudes each pixel by its darkness into a stack of voxels, smooths the stack into a mesh, and lets you paint it - by hand or by a local model making suggestions. Voxel upstream, sculpture downstream. Cubist Mode runs a live loop of both.

extruding - Qbism is not ready to meet you yet.