World space view direction in Cg geometry shader

Question

How to to get view direction in world space inside the Cg geometry shader?

Answer 1

it will be in the view matrix. Depending on your column-major or column-minor ordering, it will be in viewXf[3].xyz or flaot3(viewXf[0].w,viewXf[1].w,viewXf[2].w). Negate as desired to match your other math.