[Fluxus] pixels-renderer weirdness

[Kassen]

Dear list,

I was just playing with a old example by Gabor that I modified a bit. This
is what I have now;

(clear)

; create a new pixel primitive with active renderer
(define p (build-pixels 256 256 #t))

;(with-primitive p (hide 1))

(define (animate)
   ; draw a cube in the pixel primitive
   (with-pixels-renderer p
       (identity)
       (clear-colour 0)
       (blur .01)
       (rotate (vector (* 82 (time))
                       (* 11 (time))
                       (* 8 (time))))
       (scale 5)
       (hint-none)
        (hint-wire)
       (draw-cube))
   ; use the pixel primitive as a texture on a cube
   (texture (pixels->texture p))
   (translate (vector 2 0.5 0))
   (hint-unlit)
   (backfacecull 0)
   (draw-cube))

(every-frame (animate))
------------------------
Now for the questions;

* For some reason hiding p also makes the animation go away. Is that
expected behaviour? If at all realistic I'd like to be able to hide p yet
still have a animated texture.

* Something here is causing transparency of the texture, but not of the
pixel primitive. This looks cool but I don't understand where it comes from.
For a moment I thought that (colour x) was being translated to (colour
(vector x x x x)) where x=0 would lead to transparency, but (colour 1) also
gives transparency.

* I also don't understand why it's inconsistent, with some faces being
transparent when "looking in", others only "looking out". You'll probably
have to rotate the whole thing about a bit to see what I mean.

Yours,
Kas.
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