Re: [Algorithms] Modifying the min and max altitude in a heightmap

[Jamie F. <j.f...@re...>]

Unless you maintain a list of heixels sorted by height, I'm pretty sure you
can't do what you want. Sorry.

Jamie


Sam McGrath wrote:

> This may have a simple solution, but I haven't thought of one yet...
>
> I have a heightmap of altitude values.  The heightmap is subject to
> modification during the course of my program.  When I load the heightmap I
> compute the maximum and minimum values (altitudes).  During the program, if
> a value in heightmap that is modified goes beyond the maximum altitude, I
> assign that value to the maximum altitude (and similarly for the minimum
> altitude).
>
> However, I also want to be able to tell if the maximum value has _shrunk_
> (or if this minimum value has increased).  So far I can't think of a simple
> way to do this other than rescanning the whole heightmap whenever a value is
> modified, and clearly this is not a practical solution.
>
> Hopefully there's a nice simple method that I'm blind to, so please
> enlighten me if you can.  (-:
>
> -Sam
> ______________________
> Sam McGrath
> sa...@dn...
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