I'm attaching a test image of two inter-twined isosurfaces and the full 
scene file for reference. One isosurface has 16 wires rotating about z 
one way; the second has another 16 wires rotating the opposite way.

The newer povr functions are naturally able to calculate values suited 
for isosurfaces by default, but where possible they also have a mode 
which returns map values. The map values making it much easier to use 
*_maps on the isosurfaces in a way which always tracks the isosurface 
shape perturbations.

You can code up parallel map value calculations manually, but having 
done it myself for many years - it's a real pain to keep straight.

In this test case I primarily wanted to try passing the map values up 
from somewhere relatively low in the function call chain. The new 
functions were coded with the intent this would work, but I'd not 
actually tried a scene doing it. Looks OK to me.

Oh! FYI. On my old i3 the two isosurfaces render in about 35 seconds 
with one light no AA and no radiosity. With AA and radiosity active and 
set to be of relatively high quality, the render takes about 45 minutes.

Bill P.

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Attachments:
Download 'rotstuffkeep.pov.txt' (7 KB) Download 'rotstuffkeep.png' (372 KB)

Preview of image 'rotstuffkeep.png'

On 3/1/23 01:38, William F Pokorny wrote:
> ...

Attaching a quick derivative doodle based on the posted code.

Plus, two notes regarding the code.

First, jr let me know what I posted for code won't run with the latest 
povr tarball posted on the newsgroups. The version.inc stuff being too 
new for starters. I am working toward an updated tarball, but it's 
taking some time.

Second, I made a small, non-fatal, editing mistake shortening some lines 
so they didn't wrap when posted. I should have kept 'pigment { Red }' 
and not 'color Red' - similarly for Green and Blue pigments. My tcl 
wrapper writes 'pigment { color Red }' trying to be clear though the 
'color' token isn't strictly needed as the parser understands what Red is.

Bill P.

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Attachments:
Download 'hmm.png' (388 KB)

Preview of image 'hmm.png'