On 8/15/21 4:09 AM, jr wrote:
...
> 
> love this "stirring paint" effect.
> 
:-) Thanks.

I inherited an old leather bound book publish sometime in the mid to 
late 1800s; since given it to my daughter. In trying to learn more about 
the book, I corresponded for a time with a librarian at university which 
had a similar book. On the inside covers there were these wonderful 
color swirling patterns and I asked her how they were done.

They were made by laying down paint line in lines of differing colors 
floating atop water. A stick/or sticks would be inserted in the paint 
and spun. The blank paper would then be lowered onto the floating paint 
pattern and, presto, color swirls. Cool technique - sans computers - 
though the basics are much the same I suppose.

--- Also.
FWIW. I took a couple day run at your '-window id' feature idea and failed.

Learned quite a bit about X - enough to address two unix display issues 
Jerome uncovered some years back with all the preview displays. The 
approach tried, I borrowed from 'feh' which just added a window id 
feature. I think a more invasive method is likely necessary for POV-Ray, 
but, maybe I'm still clueless.

Also, in looking at the tcl/tk code supporting such 'adopted' windows, I 
wonder, still, about getting all the event masks and handling lined up 
so nothing is tangled that should not be - except, you know, what should be.

Maybe I'll take a run at it again down the road. I have an interest in a 
simple generic interface for things like modeling splines on the fly 
using POV-Ray as for both modeling and display - as you know.

I played some with the xcb alternative to xlib too. Why? Well, I 
strongly suspect that threads xlib fix we came up with isn't going to 
fly with a -window id / -into feature.

Bill P.

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