RT_FALLOFFΒΆ
| RT_FALLOFF_NONE | No light falloff. |
| RT_FALLOFF_INVERSE_CLAMPED | Clamped inverse light falloff. |
| RT_FALLOFF_SQUARE_CLAMPED | Clamped square light falloff. |
| RT_FALLOFF_LINEAR | Linear light falloff. |
| RT_FALLOFF_INVERSE | Inverse light falloff. |
| RT_FALLOFF_SQUARE | Square light falloff. |
| RT_FALLOFF_STEP | Step light falloff. |