Sam,

Can't you use the trace function for intersection testing an getting the normal?
Only had a swift look at the code. I.i.r.c. there was some patch that also
returned the colour at the intersection point. Brain's getting more fuzzy than
I'd like to.

Just posted a recent inc that traces objects or patterns to an inc file with
array's <web.64d47ced807074f217bac71e8ffb8ce3@news.povray.org>

ingo

"Samuel B." <stb### [at] hotmailcom> wrote:
> Hi,
>
> Here's a generic raymarcher in POV-Ray. It consists of a camera looking at a
> plane, and a pattern applied to said plane. Only diffuse shading has been
> implemented (no shadows, reflections, etc.) The pattern loops through x and y
> gradients, and uses various inputs which define the scene.
>
> I would have liked to do this using pure functions (and not pigment_map loops)
> but... solutions based on nothing but functions are hard to figure out :P

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