This is a solver I have been working on for quite a while now. A popcorn solver ! Getting the shape of popcorns is quite a challenge. Basically the heated interior of the kernel breaks out through the shell and as it expands, the shell peels backwards and rips the outer layers with it to form a cavity. The kernels uses a cloth simulation for the rigid shell, and a grain simulation for the "white stuff" with expansion driven by heat and fracturing enabled at cool down. Couple the two with an elastic force constraint and you have yourself some fairly decent popcorn. The shape of the popcorns can be controlled by altering the fracture pattern of the shell itself. Rendered with RenderMan :)


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