spot blog

flam3 camera test

This test fractal flame image was produced with this genetic code. The stripes should appear exactly even. Note the border was left around the image to show it has a transparent edge on two sides (the image is off-centered and zoomed to better exercise the code). I made this to test flam3-render's new ability to handle numbers of strips that do not divide the height of the image. Strips are used when the whole image does not fit into RAM, so it is rendered one strip at a time.

The exact command used to render this one is:

env format=png ss=2 qs=10
    nstrips=3 flam3-render < foo.flam3

So the height of the image is 410 which is not 0 mod 3. If the camera were off it would cause a horizontal line about 2/3rds of the way down the image, but it appears even.

However there does appear to be a feint vertical line near the left edge. If this is for real It would appear to be a subtle long-standing bug. It looks like a rounding error where casting was used instead of flooring, but I don't see it in the code... mystery solved Posted by spot at December 1, 2004 04:02 PM