Suppose that $Q$ is a non-definite quadratic form on at least three variables with integer coefficients, for example $Q(x,y,z)=x^2+y^2-z^2$. Let us define for a ring $R$ the group $$SO(Q)(R)= \{ \gamma \in \operatorname{SL}_d(R) \text{ }| \text{ } Q\circ \gamma=Q \}$$ special orthogonal group of this quadratic form.
Question: Is $SO(Q)(\mathbb{Z})$ generated by unipotent matrices?
I know this is true for $SO(Q)(\mathbb{R})$ and also for $SO(Q)(\mathbb{Z})$ for the example given above.