Using the cloth simulation in C4D:
I modeled the flag again, and added the same textures from my previous experiment. I notice that it’s more easy to configure the settings especially the wind for the different flags–though, I forgot to enable the cloth collision.
Anyway, using the default C4D’s Physical renderer with motion blur enabled, it took almost 4 hours for a 8 seconds animation (1280×720 pixels) on iMac 2013 model.*
*I’m using the computer for my job, and at the same time rendering in the background.
Here’s the sample animation: