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

> 1) I cannot find 'D = ray.Direction;' in my yuqk code? Where and in what
> version of source code are you seeing this?

Right because that line is not explicitly there.
D is implicitly defined as the ray direction.

Then in line 256 we do:    len = D.length();

Which is why we need to get rid of the y component for reasons explained.

So really what we need is an extra line that REdefines the _projected_ ray
direction as D = <D.x, 0, D.y> before that length and normalization take place.

- BW

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