In my simulation cardiac tissue is modeled using brick-wall architecture: rectangles represent cells, bold lines are junctions between cells (by which wave of excitation propagates):
I want each cell to be colored by its voltage.
Also I did test simulation using simpler, columnar (cells are arranged in a grid) architecture of cells network, that can be represented using heatmap:
Previously, I did quite similar visualization of neural network in MATLAB, but using columnar architecture and contour: http://jgp.rupress.org/content/suppl/2016/02/11/jgp.201511488.DC1/JGP_201511488_V1.mp4
I am experimenting with contour and heatmap, which could give better performance for real-time and good representation of the process for publishing. Also I am thinking how to visualize brick-wall architecture, maybe using mesh or poly?