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Is increasing subdivisions only about improved collision? 11 months 21 hours ago #310

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Subdivisions slice the time step in multiple Carbon substeps. Each Carbon substep executes a solver update from collision detection to N iterations of the constraint solver. So instead of having 1 sample of a time step, if you have 10 subdivisions then you have 10 samples of that elapsed time. This means that animated objects move and rotate a 10th of what they would do in a time step with 1 subdivision. So, the more subdivisions you have, the more accurate collision detection becomes, the more accurate angular motions become, and the more precise any frequency related aspects become. Elasticity / stiffness is a frequency related term, a very stiff material is like a network of super high frequency oscillators. So, more subdivisions increase time sampling thus provide better sampling for oscillators and thus help getting a better result with high stiffness materials. So, in short: subdivisions increase the solver quality and accuracy for collision detection in fast motion ( angular and Linear ) and it increases the solver ability to represent very stiff materials and stiff constraints

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