You will probably need to experiment to find the right amount of cards. Below is an example of how to try and guess some starting parameters:
With fairly even fur, you can assume about the same number of strands per-clump.
- Maybe you think 40 strands-per-clump is reasonable:
351000/40 = 8775, and we use 3 cards-per-clump so8775*3 = 26325 cards. - Total triangles can be based on number of cards (also consider poly budget). Very low-poly would be 4 tris-per-card (1 bend):
26325*4 = 105300 tris. Higher poly maybe 8 tris-per-card:26325*8 = 210600 tris - Number of textures should be based on the number of unique strand layouts you think you will need. Start small (maybe 30) and increase as necessary. Note that the more textures the better the original strand layouts are captured, but the worse the resolution of the individual strands.
- For better performance on very large strand inputs, set the number of flyaways to 0, this will disable the flyaway detection which can often be very slow in the case of fur.
This is just an example, but hopefully gives a bit of an idea of how to set the parameters. There isn’t another solution in-engine for autogenerating cards from strands. However, there may be some plugins on the marketplace that are more tailored for fur. We are working to improve the usability of the hair card generator so that it’s easier to figure out what parameters may work.
Hope this helps