Title: How is the "distance estimator" derived? Post by: pauldoo on June 07, 2010, 04:55:32 PM Hi,
For my work in progress renderer I am using the distance estimation expression of "0.5 * |w| * log(|w|) / |δw|" which I found at the following link: http://www.subblue.com/blog/2009/12/13/mandelbulb This seems to work great, but I am very confused as to how this expression was derived. Does anyone have pointers for that? Title: Re: How is the "distance estimator" derived? Post by: David Makin on June 07, 2010, 10:04:11 PM This seems to work great, but I am very confused as to how this expression was derived. Does anyone have pointers for that? Not surprised you're having trouble finding it (at least here anyway) - the post is buried in "the thread" here (wait for it to locate): http://www.fractalforums.com/3d-fractal-generation/true-3d-mandlebrot-type-fractal/msg8505/#msg8505 You may like to check out a number of the follow-up posts. |