create 'spider web' fracturing shape

Forums Technical Discussion create 'spider web' fracturing shape

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metaclay: Member; 122 posts; Joined: May 2006; Offline

March 9, 2011 9:17 p.m.

Hi, i've been playing with shatter/fracturing, so far i always got quite random shape, i know i can control the density at specific surface etc. But right know i want to konw if possible , how to get specific shape of the fracturing, so i want the fracturing pattern like a spider web, it breaks from a center point and spread out. And the pieces also have a bit specific long thin shape, to be real , it's more like a crack on car's window when it's hit by a bullet, you'll see ‘spider web’ pattern. Any idea ?

thanx


3Dude: Member; 39 posts; Joined: July 2010; Offline

March 10, 2011 4:40 a.m.

hm, sounds to me like a job for a clip-sop/foreach-sop combination. If you
want decent control over the fracture do it manually. but maybe I'm wrong


pclaes: Member; 257 posts; Joined: Nov. 2007; Offline

March 10, 2011 5:25 a.m.

There is an example of this type of clip/foreach tool in this dvd - for 2D cases:
http://www.3dbuzz.com/xcart/product.php?productid=58&cat=0&page=1&featured [3dbuzz.com]

If you want it in full 3d I would go with a high resolution voronoi split, but group pieces together to get the concave shapes. required for those rounded pieces. The way you scatter your initial points for the voronoi will be important too.

Cg Supervisor | Effects Supervisor | Expert Technical Artist at Infinity Ward
https://www.linkedin.com/in/peter-claes-10a4854/ [www.linkedin.com]


redpaw: Member; 75 posts; Joined:; Offline

March 10, 2011 2:21 p.m.

try this I used it recently and it works pretty well.

make a couple of circles with a limited number of points. say 5 or 7
overlap them slightly and align them to the surface you want to shatter.

pipe their points into the points input of the voroni shatter sop.
and run the shatter.

you should get a radial like shatter from this pretty well.

depending on how you move things around in the points you should get some nice radial shards out of this, if you put a small amount of scatter points on there too, it will start to break up things nicely .

I don't have any time right now to make a hip example, but this should work pretty well for ya

-johnc


zarti: Member; 330 posts; Joined: July 2007; Offline

March 10, 2011 3:31 p.m.

hi ,

to have more control ( frequency or orientation ) , you might use a simple sphere too …

.cheers

Attachments:
radial_shatters.png (71.2 KB)
radial_shatters2.png (85.5 KB)

except the things that cannot be seen , nothing is like it seems .


metaclay: Member; 122 posts; Joined: May 2006; Offline

March 11, 2011 10:47 p.m.

Hi guyz that's soo COOL … exactly what i'm looking for. thanx a lot. I'm working on it now. Well it's a bit tricky to get the shape i want. But i got the idea.

Thanx


zarti: Member; 330 posts; Joined: July 2007; Offline

March 12, 2011 2:47 p.m.

hi ,

started as a curiosity to consume and just figured out how to build a spiderWeb DA . if not complete , there is the skeleton .

let me know if you need it .

love houdini

.cheers

Attachments:
spiderWeb.png (48.7 KB)
spiderWeb_shatters.png (55.7 KB)

except the things that cannot be seen , nothing is like it seems .


metaclay: Member; 122 posts; Joined: May 2006; Offline

March 13, 2011 2:11 p.m.

zarti
hi ,

started as a curiosity to consume and just figured out how to build a spiderWeb DA . if not complete , there is the skeleton .

let me know if you need it .

love houdini
.cheers

Hi Zarti,
yes i like to try it if you don't mind, thanx for sharing anyway


zarti: Member; 330 posts; Joined: July 2007; Offline

March 13, 2011 7:13 p.m.

here it is ,

its parameters are over the ‘ DONE ’ null node .
those names aren't so clear , but play with the sliders to see what they do .

.cheers

Attachments:
spiderWebShatters_002.hipnc (120.5 KB)

except the things that cannot be seen , nothing is like it seems .


metaclay: Member; 122 posts; Joined: May 2006; Offline

March 14, 2011 11:53 a.m.

zarti
here it is ,

its parameters are over the ‘ DONE ’ null node .
those names aren't so clear , but play with the sliders to see what they do .

.cheers

Hi Zarti thanx a lot for sharing. i'll try and see if i hit a problem then

i'll be back.

thanx


VisualCortexLab: Member; 509 posts; Joined: July 2005; Offline

March 14, 2011 11:59 a.m.

not sure if you missed something in the final HIP file but I could get it working only by changing your forvalue expression with the default one:

stamp(“../../foreach1”, “FORIDXVALUE”, 0)

stamp(“..”, “FORVALUE”, 0)

loading the scene with your expression gives me warnings on load and then doesn't seems to work. check it out!

edit: btw, such expressions where in the pointJitter and in the ROTATE nodes inside the foreachSOP

JcN
VisualCortexLab Ltd :: www.visualcortexlab.com


zarti: Member; 330 posts; Joined: July 2007; Offline

March 14, 2011 3:40 p.m.

hi sum][one ,

strange i never got any message when i reloaded the hip , even with the one uploaded here . also , there was nothing removed from the hip file before uploading it .

my experience with houdini is modest , so i'm unable to explain why that happened or how i could avoid a similar thing happen again in future

thank you for the correction .

.cheers

except the things that cannot be seen , nothing is like it seems .


xyzDist: Member; 8 posts; Joined: Dec. 2006; Offline

July 20, 2014 1:49 a.m.

After messing around, got some decent pattern….

maybe useful to you.

Attachments:
bulletHit_pattern.04.hip (150.1 KB)

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