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I first asked in newbie group but got no answer. Hopefully, someone here
might know. Not sure if it belongs in this group but I am really looking
for an answer.
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I am looking to create an effect where I have a tube and there is algae
growing off of it. The rough shape is similar to this image:
http://www.fortunecity.com/greenfield/hawks/191/ChekJawa/chek3.jpg
That seems to be a real thing so no pov model is available :).
I am wondering whether there is a tool which generates such things. It is
not quite landscape or tree generator (needs to be semitransparent and no
branching and does not grow on a plane but on a tube, also needs to
"wiggle").
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"sumdumguy" <nomail@nomail> wrote:
> I first asked in newbie group but got no answer. Hopefully, someone here
> might know. Not sure if it belongs in this group but I am really looking
> for an answer.
> -------------
> I am looking to create an effect where I have a tube and there is algae
> growing off of it. The rough shape is similar to this image:
> http://www.fortunecity.com/greenfield/hawks/191/ChekJawa/chek3.jpg
> That seems to be a real thing so no pov model is available :).
> I am wondering whether there is a tool which generates such things. It is
> not quite landscape or tree generator (needs to be semitransparent and no
> branching and does not grow on a plane but on a tube, also needs to
> "wiggle").
OK, they took down the image, and in any case it seems the animal is called
"tube anemone" not algae. If you search google images for:
"colorful tube anemone" Cerianthus
it's the only entry. Sorry, I cannot post images directly to the group.
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I don't think there is a pre-done package
for wiggly shapes. Here's a couple of macros
that might be of use in creating an anemone
script or macro. The first one gets a random point on
a surface, that could be used to place the tentacles
at the base. The other is a macro for collision
detection, this could be used to make sure the
tentacles don't overlap.
#include "rand.inc"
#macro RandOnSurface(Obj, rsd, thresh)
#local mn = min_extent(Obj)-thresh;
#local mx = max_extent(Obj)+thresh;
#local dist = 1000000;
#while (dist>thresh)
#local flag = 0;
#while (flag = 0)
#local rfrom = VRand_In_Box(mn, mx, rsd);
#local rdir = VRand_On_Sphere(rsd);
#declare Norm = <0, 0, 0>;
#local hit = trace(Obj, rfrom, rdir, Norm);
#if (vlength(Norm) != 0)
#local flag = 1;
#end
#end
#local dist = vlength( hit - rfrom);
#end
#local result = hit;
(result)
#end
#macro collision(A, B, rez)
#local result = false;
#if (((min_extent(A).x > max_extent(B).x ) |
(min_extent(B).x > max_extent(A).x ) |
(min_extent(A).y > max_extent(B).y ) |
(min_extent(B).y > max_extent(A).y ) |
(min_extent(A).z > max_extent(B).z ) |
(min_extent(B).z > max_extent(A).z ))=false)
#local AB = intersection{object{A} object{B}};
#local Mn = min_extent(AB);
#local Mx = max_extent(AB);
#local S1 = seed(1);
#local Pt = VRand_In_Box(Mn, Mx, S1);
#local cnt = 0;
#while ((result = false) & (cnt < rez))
#local Pt = VRand_In_Box(Mn, Mx, S1);
#if (inside(AB, Pt))
#local result = true;
#end
#local cnt = cnt + 1;
#end
#end
result
#end
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