### Some puzzles on concepts.

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4 months ago by
Dear all,
I meet some puzzles on some concepts in different papers.
1. the "source"(expanding) cell and "destination" (being overwritten) cell in CPM described in the reference manual and the pixel-copy-source and pixel-copy-destination pixel.
Are the positions of source and destination opposite for cells and pixels? That's to say, the pixel-copy-source pixel belongs to the "destination"(old) cell and the pixel-copy-destination pixel belongs to the "source"(new) cell? For pixels, do the "source" and "destination" in the manual have the same meaning of the "source" and "target" in the following color picture from other paper?

2. what's more, for the changed energy of chemotaxis, do the parameter  $\lambda$λ  and  $\chi$χ have the same sign in the following expressions when the cells have the same chemotaxis? If so, the cell moves to high concentration when λ< 0?

Thank you~
Yuan

Community: CompuCell3D

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3 months ago by
Actually this is the correct way of associating source destination old and new:

the pixel-copy-source pixel belongs to the "source"(new) cell and the pixel-copy-destination pixel belongs to the "destination"(old) cell?

Q: For pixels, do the "source" and "destination" in the manual have the same meaning of the "source" and "target" in the following color picture from other paper?

A: It appears that the answer is no. To me source is the pixel of that belongs to a cell (new cell) that will try to overwrite destination (old cell) . This is how things are coded in CC3D

Does this make sense?
Yeah, I see. There are some differences though both of them are CPM models. Besides, is there a manual explaining the implementation of the CC3D code？
written 3 months ago by Yuan
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3 months ago by
Yes, it is for older version 3.4.1, however. Still the core concepts are there and architecture of plugins and steppables has not changed much - in particular w.r.t what is new(source ) cell and what is old(destination) cell

http://www.compucell3d.org/BinDoc/cc3d_binaries/Manuals/Developers_Documentation_v3.4.1.pdf

Take a look at it