Noise in painted areas ?

Forums Technical Discussion Noise in painted areas ?

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_Christopher_: Member; 767 posts; Joined: April 2014; Offline

Feb. 5, 2017 2:26 p.m.

I want to have noise (vop) only effect painted areas but when binding the override color attribute from the paint sop in a attribute vop; there isn't any noise being applied to only the painted areas, when plugged into Cd; instead my entire mesh is multi-colored ? Must I use the override color parameter; and if so, how ? Sorry a little rusty in that respect

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sepu: Member; 461 posts; Joined: Feb. 2012; Offline

Feb. 5, 2017 2:44 p.m.

Define it first upstream then use paint node with “override color” with your custom attribute.

So in a wrangle you can do

f@painted = 0;

then add the paint node and check the override, add the “painted” attribute in the override color and paint whatever you want to override.
Then in a second wrangle connect the paint in the first input and the noise in the second input and just add a lerp function to control how much of the noise you want to see.

@P = lerp(@P , point(1, "P", @ptnum), ch("blend") * f@painted);

Edited by sepu - Feb. 5, 2017 14:47:43


_Christopher_: Member; 767 posts; Joined: April 2014; Offline

Feb. 5, 2017 3:09 p.m.

sepu - I want to do this in VOPS, if it can be created in VOPS or must I use a create attribute before the paint node ?

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sepu: Member; 461 posts; Joined: Feb. 2012; Offline

Feb. 5, 2017 3:18 p.m.

The same thing applies, take a look at the file, you have a attribute create + a VOP and the wrangle option as well .

Attachments:
painted.hipnc (110.9 KB)


circusmonkey: Member; 2624 posts; Joined: Aug. 2006; Offline

Feb. 5, 2017 3:23 p.m.

Hi See attached > Paint sop defines the masked area for noise

Attachments:
noise_painted.hip (129.7 KB)

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_Christopher_: Member; 767 posts; Joined: April 2014; Offline

Feb. 5, 2017 6:04 p.m.

Thanks guys, that helped

One thing still remains.

I want to use AANoise specifically on only those painted areas so I get a 3D carved noise; here is my VOP network.

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circusmonkey: Member; 2624 posts; Joined: Aug. 2006; Offline

Feb. 5, 2017 7:06 p.m.

Hi , have you looked at my example ?

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_Christopher_: Member; 767 posts; Joined: April 2014; Offline

Feb. 5, 2017 11:34 p.m.

circusmonkey
Hi , have you looked at my example ?

Of course

I just want to know how to get mine working without the wrangler, as you have in place ? Also @noseid is a standard attribute or custom ?

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circusmonkey: Member; 2624 posts; Joined: Aug. 2006; Offline

Feb. 6, 2017 12:43 a.m.

See attached , id is. The @ symbol , is just used in the wrangle !

Edited by circusmonkey - Feb. 6, 2017 00:46:21

Attachments:
noise_painted_withnoise.hip (131.4 KB)

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_Christopher_: Member; 767 posts; Joined: April 2014; Offline

Feb. 6, 2017 1:09 a.m.

circusmonkey
See attached , id is. The @ symbol , is just used in the wrangle !

Ah, your assigning Cd to the attribute (@noiseid) why didn't you declare it as a float or vector ?

Hrm, I understand your scene

What if I don't want to use the wrangler and do what you did in the wrangler in VOPS ?

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circusmonkey: Member; 2624 posts; Joined: Aug. 2006; Offline

Feb. 6, 2017 3:05 a.m.

Floats are automatically declared so @noiseid will be a float automatically.

What if I don't want to use the wrangler and do what you did in the wrangler in VOPS ?

You could do it all in vops depending on what the rule is, ie @ptnum > 5 .Which would say all point numbers greater than 5 get noise.

Rob

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_Christopher_: Member; 767 posts; Joined: April 2014; Offline

Feb. 7, 2017 12:05 a.m.

I got it !

It's not the best at this point, atleast it's something that works, that I can work with

The problem is, where I didn't paint is also getting effected by the noise ?

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_Christopher_: Member; 767 posts; Joined: April 2014; Offline

Feb. 7, 2017 10:05 a.m.

Sorry, no wonder no one know replied; as they didn't know what I was talking about

The solid red is where I painted; what are those color blobs ?

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dennisvolkerts: Member; 16 posts; Joined: June 2012; Offline

Nov. 28, 2018 6:24 a.m.

Havent looked inside the files but you can just multiply the color by the displacement amount right?

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