Gradient 2
This surface has the same shape as the Standard surface, with media whose index of refraction is described by
where r2 = x2+y2. Eight parameters are required: the maximum step size, Δt, the base index squared, n0, and the remaining six coefficients of the preceding equation. Note that some of the coefficients have units.
The maximum step size Δt determines the trade-off between ray tracing speed and accuracy. For details see "Discussion on maximum step size for GRIN surfaces". Also see "Restrictions on surfaces following GRIN surfaces".
PARAMETER DEFINITIONS FOR GRADIENT 2 SURFACES
| Parameter # | Definition |
| 1 | Δt |
| 2 | n0 |
| 3 | nr2 |
| 4 | nr4 |
| 5 | nr6 |
| 6 | nr8 |
| 7 | nr10 |
| 8 | nr12 |
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