Iris texture, a decal projected over the sclera of the eye.

[ZAQraven]

Why need this?

• To go away from using complete sphere mesh.
• For some cases that character has flat eyes.
• Even if it can be managed to enlarge the eyeball, it may inevitably clip out the eye socket.

https://github.com/supertuxkart/stk-code/assets/79313756/e35952c8-9096-4a46-8417-7e60a7399d19

How does it work? Iris texture will act as a translucent decal that is projected over the eye mesh and travelled around it. To control the Iris texture can use bone such as eye_l and eye_r. The bone will be not used as skinning mesh.

Reference:

• https://developer.valvesoftware.com/wiki/Eyes
• https://developer.valvesoftware.com/wiki/Eyeball