POV-Ray : Newsgroups : povray.unofficial.patches : On the long unfinished normal related warps in warp.cpp. : On the long unfinished normal related warps in warp.cpp. Server Time
30 Sep 2023 06:31:01 EDT (-0400)
  On the long unfinished normal related warps in warp.cpp.  
From: William F Pokorny
Date: 17 May 2021 09:00:10
Message: <60a268da$1@news.povray.org>
The warp.cpp source code has long had some unfinished normal related 
warp and unwarp hooks. Those of us working on the code of late haven't 
really understood them - as far as I know.

Patterns today work in the normal block with all sorts of transforms and 
warps, so those hooks are aimed at...?

While working of late on normal block patterns it hit me we don't warp 
the incoming normal, but rather the perturbation patterns/methods via 
the unwarped / warped EPoint(1). We cannot today warp the incoming raw 
normals with warp{}s.

So, I started to play with an idea for new normal pattern which 
allows/enables this. It's currently working with the difference between 
the intersection location and the warp{} / turbulence affected EPoint. 
In other words, there isn't an actual specific perturbation method / 
pattern - it's whatever your warp{}s create.

Attached are a couple of images. One uses three repeat warps and a touch 
of turbulence. The second a spiral -> turbulence -> spiral combination.

Still playing / thinking, but looks promising.

Bill P.

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Download 'nrmlpertbywarps.jpg' (77 KB) Download 'nrmlpertbywarps1.jpg' (85 KB)

Preview of image 'nrmlpertbywarps.jpg'

Preview of image 'nrmlpertbywarps1.jpg'


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