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That's the idea:
https://github.com/MarcWeber/creating_animated_gimp_brushes
summary:
use povray to create animated brushes by creating a brush tip, then rendering a
depth map. I use pigment { function } and amibient { rgb 1} as suggested
somewhere else. That's fine.
Now when tilting the tip, I'd like to align the bottom of the tip at the y=0
pane.
Align_Trans works fine:
#declare my_prism =
prism {
cubic_spline
0, // sweep the following shape from here ...
1, // ... up through here
6, // the number of points making up the shape ...
< 3, -5>, // point#1 (control point... not on curve)
< 3, 5>, // point#2 ... THIS POINT ...
<-5, 0>, // point#3
< 3, -5>, // point#4
< 3, 5>, // point#5 ... MUST MATCH THIS POINT
<-5, 0> // point#6 (control point... not on curve)
scale 0.15
rotate <0, 0, 90>
translate <+0.1, 0, 0>
rotate <rotate_x / 2, 0, rotate_z /2>
rotate <rotate_x / 2, 0, rotate_z /2>
};
object {
my_prism
Align_Trans(my_prism,-y, <0,0,0>)
TEXTURE
}
however using rotate_x or rotate_z other than 0 makes it fail.
So it looks like the bounding box gets rotated, too.
Is there another way I can try?
I could incrementally move the tip down till I get a "white" pixel (meaning I've
hit the plane) - but that's cumbersome.
I've seen that there is another thread at "advanced users" - there is even a
patch to create depth maps. Maybe I can use that and create a simple text file
containing depth as 2-dimensional float array which I could use to create the
brush tip easily.
Marc Weber
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