How move the back clipping plane back so as to draw larger models without them being clipped?

Are you using OpenGL?

(Sorry hit the wrong button)
If you''re using OpenGL check out the "glFrustrum" function.

glFrustum(
GLdouble left,
GLdouble right,
GLdouble bottom,
GLdouble top,
GLdouble znear,
GLdouble zfar
);

Then set the "zfar" a bit further...

Or with

gluPerspective(double angle,double aspect,double near,double far);
set a higher far value.

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