3d - generating perpendicular normals from 8-point cube -

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i think i'm being dumb right can't seem think of nice way this:

basically creating load of cubes in directx , using vertexpositioncolor store data. store cubes efficiently i'm storing 8 points per cube. thing though, want normal of each face point away such front face's normal (0, 0, 1) , face's normal (0, 0, -1).

my problem working out how efficiently 8-point cubes. know 24-point cube representation seems inefficient memory point-of-view.

any ideas how can this? preferably in shader or efficient?

thanks

you can use indecies save memory, 8x4 floats + 4*6 ints each side, 56*4 bytes instead of 96*4 bytes, can do, unless points shared between cubes.


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