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amin.khormaei

Pre-solve Post-solve

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pre solve means before the timestep has been solved. Post solve means after the timestep has been solved.

In a very simple term you can think of it like this: Before the point has moved, after the point has moved for the given timestep

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Amin, you can also dive inside and see, what exactly happens before pre-solve, after post-solve, and between them. I have attached a picture.

For example, you can see, when the @pprevious attribute gets written, it is in between the Pre-Solve and Post-Solve inputs (in the node named "stash_current_pos"). So, if a new particle is sourced in the current timestep (usually in the post-solve input), its "has_pprevious" attribute is 0.

popsolve.png

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