William F Pokorny <ano### [at] anonymousorg> wrote:

> Assuming you want access to the real internally generated >first rays,

Nope.
Just something like:

#declare SFn_vdot = function (ax, ay, az, bx, by, bz) {ax*bx + ay*by + az*bz}

#declare f_Reflectionx = function (Dx, Dy, Dz, Nx, Ny, Nz) {Dx - 2 * SFn_vdot
(Dx, Dy, Dz, Nx, Ny, Nz)* Nx}
#declare f_Reflectiony = function (Dx, Dy, Dz, Nx, Ny, Nz) {Dy - 2 * SFn_vdot
(Dx, Dy, Dz, Nx, Ny, Nz)* Ny}
#declare f_Reflectionz = function (Dx, Dy, Dz, Nx, Ny, Nz) {Dz - 2 * SFn_vdot
(Dx, Dy, Dz, Nx, Ny, Nz)* Nz}

which in sane functions would like a macro formula:

#macro Reflection (Direction, Normal)

 //#local Refl = 2*Normal*(vdot(Normal, V)) - V;
 #local v_reflection = Direction - 2*vdot (Direction, Normal)*Normal;

 v_reflection

#end

> the other forms are quite a bit harder / uglier to do than is trace().
> Further, the results for other than initial / first rays are also
> tangled in render settings and options.

Oh, I can only imagine...  :O

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