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i want to move iris on eye surface ( eye shape is mostly similar to oval not sphere ) and i want to do it with shapekey enter image description here

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the problem is , when shapekey value changes , it cross other surface of mesh , is it possible to split shapekey value to smaller part and define a deform pattern for each parts, for example from 0 to 0.1 shape deform like x , from 0.1 to 0.3 shape deform like y and... .

i want to export my model to unity , in unity shapekeys works with no problem , but modifiers like shrinkwarp not . or can anyone suggest another way for moving iris on eye that works with no problem in unity engine?

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i found the answer best way is add iris texture on eyeball (shrikwrap modifier not working in unity) then import model in to unity , in unity add texture to eyeball material , for moving the iris must offset the texture from inspector and for eye movements must make animation from windows->animation->animation enter image description here

making shapekey for iris is not a good idea.

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