Hair Cards Look Flat or Fake
Hair that reads as flat strips
Also known as: Hair cards flat · Fake looking hair cards · Hair cards tutorial · Game hair looks bad · Hair cards layering · Hair cards alpha
Quick answer
Hair cards look flat when they are placed as evenly spaced, parallel strips with the same length and width. Layer the cards from the scalp outward, with a solid base layer under the surface cards, vary their length, width and rotation, follow the natural flow of the hair, and add a few loose flyaway strands. Use a texture with soft, varied strands, a gradient of color from root to tip, and correct highlights.
How to fix it
Build the hair in clumps, from big shapes to small, and keep the card count under the budget for the platform. Use a tangent-based or anisotropic highlight if the engine's hair shading supports it, and keep the alpha edges soft, relying on anti-aliasing to smooth them. For close-ups and high-end projects, strand-based hair is an alternative, while cards remain the standard for most game characters.
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See also
Hair Cards vs Strand Hair
Two ways to make hair in real time
Blend Mode
How a material combines with what is behind it
Alpha Channel
Fourth channel that stores transparency or a mask
Two Sided Material
Show a surface from both sides
Overdraw
Redrawing same pixels
Skin Shading
Subsurface scattering and specular for skin