POV-Ray : Newsgroups : povray.advanced-users : Crushed box corner : Re: Crushed box corner Server Time: 22 Jul 2019 22:45:13 GMT
  Re: Crushed box corner  
From: William F Pokorny
Date: 30 Jan 2018 12:11:03
On 01/29/2018 09:49 PM, Bald Eagle wrote:
> William F Pokorny <ano### [at] anonymousorg> wrote:
>> Understand your looking for mesh functionality, but you can fairly
>> quickly get a dented box look with an isosurface by routing a box
>> function through pigment(1) so as to have access to the pigment pattern
>> modifiers.
> That, Sir, is a fascinating approach, and the iterative black hole warps are an
> interesting way to "crinkle" the edge.
> I had to increase the strength to 4 to see what was really going on there.
> I will think on this some more - even if not perfectly suitable to the "My
> parcel got squished" look at hand, this certainly is an inspiring method - all
> sorts of possibilities.
> Thank you for that unexpected intellectual bright spot in an otherwise
> stultifying day  :)
Happy to help with the anti-stultifying - if nothing else. :-)

I admit to not spending much time positioning the black_holes in the 
example scene. Also remember in the shipped version of POV-Ray, we are 
somewhat limited in what can be done with black_hole warps. The pulling 
black_hole in fact clamps at strengths above 1 and can pull coordinates 
from outside the range of the sphere depending on usage. The clamping 
behavior can be very useful for effects, but it isn't very black hole 
like in general. The clamping behavior is why I left the strength in my 
example at 1.

A while back I posted some images for a proposed 'type 1' set of 
black_holes which fixes the pulling black hole while leaving the inverse 
behavior as is. I always planned to try additional types in addition to 
the pulling fix - including one that ripples about an axis in the 
sphere. Not too long ago, I  closed my github pull req for the new 'type 
1' to work on others - and promptly got distracted. :-) I am keeping the 
'black_hole type 1' feature branch on github current with master should 
anyone want to pull it into their private POV-Ray compiles as I do mine. 

Bill P.

Post a reply to this message

Copyright 2003-2008 Persistence of Vision Raytracer Pty. Ltd.