merge object using level set

Forums Technical Discussion merge object using level set

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syzmatrix: Member; 111 posts; Joined: Dec. 2008; Offline

May 13, 2009 9:56 a.m.

hi everyone:

this is from the spiderman3. using level set to merge object smoothly. I tried several times in houdini.But it not works.

could some nice people give a example to show how can I acheive this effect just using simple geometries?

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snapshot20080704151338.bmp.jpg (22.3 KB)


syzmatrix: Member; 111 posts; Joined: Dec. 2008; Offline

May 13, 2009 9:57 a.m.

two

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syzmatrix: Member; 111 posts; Joined: Dec. 2008; Offline

May 13, 2009 9:57 a.m.

three

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syzmatrix: Member; 111 posts; Joined: Dec. 2008; Offline

May 13, 2009 9:58 a.m.

four

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5a.jpg (28.3 KB)


syzmatrix: Member; 111 posts; Joined: Dec. 2008; Offline

May 13, 2009 9:59 a.m.

five

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5b.jpg (43.7 KB)


syzmatrix: Member; 111 posts; Joined: Dec. 2008; Offline

May 13, 2009 10 a.m.

six

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syzmatrix: Member; 111 posts; Joined: Dec. 2008; Offline

May 13, 2009 10:01 a.m.

seven

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5d.jpg (36.7 KB)


syzmatrix: Member; 111 posts; Joined: Dec. 2008; Offline

May 13, 2009 11:36 p.m.

So,let me make it more clear.

Is it possible to quaue query the per vexel sdf attribute , do some math, and modify the attribute.


danBode: Member; 50 posts; Joined: Feb. 2009; Offline

May 14, 2009 12:14 a.m.

syzmatrix
Is it possible to quaue query the per vexel sdf attribute , do some math, and modify the attribute.

This can be done with the Volume Vop SOP. Try converting both objects to SDFs using the IsoOffset SOP then piping them into a Merge and the Merge into Volume VOP SOP. An important thingto note though, is that on Spiderman the SDFs they used had positive values inside the surface and negative values outside, while Houdini's SDFs are reversed.


syzmatrix: Member; 111 posts; Joined: Dec. 2008; Offline

May 14, 2009 5:49 a.m.

hi danBode

thanks very much for your reply. This is really nice of you to provide such a valuable suggestion.

I am working on it. There is still some problem I can not fix.
could you give a very simple hip file that I may understand it better.?

thank you very much again.


danBode: Member; 50 posts; Joined: Feb. 2009; Offline

May 14, 2009 5:17 p.m.

Here's a test I made for myself a while ago while trying to do the same thing. For smoothing the intersecting areas, I tried using the math from Spiderman, in a volume mix SOP but when I couldn't seem to get that working, I did my own math in a volume VOP SOP. Hope it helps.

Dan

Attachments:
dmb_sdfTest3.hipnc (542.1 KB)


syzmatrix: Member; 111 posts; Joined: Dec. 2008; Offline

May 15, 2009 12:55 a.m.

Hi danBode

Thanks very much for your great contribution, you are really a nice person with excellent understanding of houdini. It is my pleasure to meet you here!

cheers 8)

sun


Benyee: Member; 56 posts; Joined: April 2008; Offline

Nov. 5, 2011 12:40 a.m.

But how to control erosion of the level sets?Thanks.

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