Can particle clouds be used for rendering volumes? For example, use a 3D grid of particles, and then hide particles which are not near the edge of an isosurface? Long story short, can I shrink the size of a particle to zero in the node material editor?
No, the size of the particles are controlled outside the shader by the minSize / maxSize properties of the particle system. You can try to play with the particle color to make it disappear depending on some custom decisions.
But I’m not sure particle systems are adapted to volume rendering as they have some specific dynamics governed by the properties of the particle system…
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