Given a normalized 3D vector, here’s an efficient method for computing a full basis. The computed basis is axis aligned if the input vector is axis aligned.
void ComputeBasis(const Vec& a, Vec* b, Vec* c)
// Suppose vector a has all equal components and is a unit vector: a = (s, s, s)
// Then 3*s*s = 1, s = sqrt(1/3) = 0.57735. This means that at least one component of a
// unit vector must be greater or equal to 0.57735.
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if (Abs(a.x) >= 0.57735f)
b->Set(a.y, -a.x, 0.0f);
b->Set(0.0f, a.z, -a.y);
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b = Normalize(b);
*c = Cross(a, *b);
In SSE land you can eliminate the branch using a select operation.