pub const RAY_FN_NONE: u8 = 0x00;Expand description
Function attribute flags for ray_fn_unary / ray_fn_vary, from the core’s
src/lang/eval.h:33-40. They are #defines in a header wrapper.h does
not include, so bindgen never sees them.
RAY_FN_NONE is what a plain callback wants: no auto-mapping over vectors,
no aggregation, args evaluated normally.