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Heiner

Smoothing geometry

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Hi there,

 

currently i am again pursuing one of my favorit projects, which means I am working on an character.

I am modelling the head at the moment, and i am quite happy with the outcome so far. Since I am going for

a rather realistic look, the model got quite dense, but with the current hardware available thats no problem anymore.

What is a problem, however, is that I have problems to get really smooth surfaces in regions where they are needed.

That is cheeks, around the mouth, chin and such. To adust all that manualy is almost impossible.

It seems as if the problem is not only a issue of the realtime display, but also of the rendered images. As you can see,

in the rendered image the dents and uneven spots are a little less, but they are there. I used the porcelain material.

What I would need is a function like "smooth region". Anybody has a good idea how to archive that? Is there a

parameter in the porcelain material, which can be tweeked to get things look smooth?

 

Cheers

Heiner

AM_Wrinkle_Problem.jpg

AM_Problem0.jpg

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I think you have way more splines than you need to make those shapes. As a general rule you should just have splines at the peaks and valleys of curves and intermediate CPs are rarely needed.

 

The more CPs you have along a curved surface the harder it is to precisely position them to appear smooth. This is quite a different strategy than in polygon modeling where you HAVE to have lots of facets to simulate a smooth curve.

 

Splines ARE smooth curves and we can take advantage of that.

 

Look at this. These are both about the same shape but the bottom version uses more CPs than are needed to define the contours. It is difficult to make many very slight curve segments smooth together.

 

Just use CPs to define the peaks and valleys and let the spline smooth the big curve in between.

 

peaksandvalleys.JPG

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I might cite my Al Capone head as an example fewest possible splines to help make smooth features.

 

Look at the wireframes and renders...

 

Al Capone

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I might cite my Al Capone head as an example fewest possible splines to help make smooth features.

 

Look at the wireframes and renders...

 

Al Capone

 

Do not forget the "Average Normals" feature which may help alot too.

 

See you

*Fuchur*

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Thanks Robcat,

good hint and cool modell.

I started to reduce my head already and making nice progress.

However, I dont think that i can reduce it so much as you did it on your

Capone model.

@Fuchur:

Average Normals looks very muck like what i am searching for. I found it in the techRef,

but I can not find it in AM. Its a Material parameter, right?

Cheers

Heiner

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Hi Heiner,

Average Normals is a 'Surface' parameter.

How you access it will depend on which version of A:M you are using.

In v18 it's the last two settings at the bottom of any given group's Surface properties . Turn it 'On' and set 'Normal Weight' to 50%. (This seems to be the best % in most situations)

In v17 and lower, you need to first turn on 'Render As Lines' in a given groups Surface properties and then turn it OFF again.

You should now have access to the 'Average Normals' settings as in v18.

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Hi there,

 

the idea with the lesser splines is nice and I already applied it to my model, as far as I see possibilities for it.

I go me a good deal farther as you can see in the latest render.

Then i wanted to try that "Average Normals" but i am a bit confused. I am on V18 and I do find the option for

the "normal weights" and used it, but it seems as if its not causing any effect ... Do I have to switch on any of the

Render Shaders as well?

Thanks so far,

Heiner

AM_Problem0.jpg

AM_Problem_1.jpg

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Hi again,

No you shouldn't need to switch on any shaders as well.

But looking at your screenshot I do see, or rather don't see, the option to actually turn on 'Average Normals'

Here's a shot of a typical 'Surface' properties panel I get in v18.

 

You shouldn't need to do the following in v18 but have you tried the old v17 trick of turning On and then Off again 'Render As Lines'. Dose that give you the option to turn it on?

It could be that you have inadvertently found a v18 bug here!

Screen_Shot_2014_01_09_at_13.52.12.png

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Hi again,

No you shouldn't need to switch on any shaders as well.

But looking at your screenshot I do see, or rather don't see, the option to actually turn on 'Average Normals'

Here's a shot of a typical 'Surface' properties panel I get in v18.

 

You shouldn't need to do the following in v18 but have you tried the old v17 trick of turning On and then Off again 'Render As Lines'. Dose that give you the option to turn it on?

It could be that you have inadvertently found a v18 bug here!

 

Hm... tried it yesterday with a model and I've got the option in v18.

 

See you

*Fuchur*

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OK, thats good, so I am not just missing something.

So, Fuchur, what version is that you made the screenshot of?

I will check tonight at home what version I have ...

Cheers

Heiner

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Good work on the spline reduction!

 

It will also be easier to rig with fewer CPs.

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Ok, now I am officially abit confused.

I am working on windows 7, and on AM version 18.0 SSE 4.

I am not getting the "Average Normals", its simpy ot there ...

I attached a screen how the surface menue looks here ...

Any ideas ... ?

Thanks

Heiner

AM_Problem_2.jpg

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Ok, now I am officially abit confused.

I am working on windows 7, and on AM version 18.0 SSE 4.

I am not getting the "Average Normals", its simpy ot there ...

I attached a screen how the surface menue looks here ...

Any ideas ... ?

Thanks

Heiner

Do you have "show Advanced Properties" turned on in the options?

Screen_Shot_2014_01_09_at_12.46.17_PM.png

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Do you have "show Advanced Properties" turned on in the options?

 

Yup, I think that's it.

 

 

This should be reported as a bug to AMReports

 

"Normal Weight" should not appear unless "Average Normals" is ON and neither should appear unless "Advanced Properties" is checked.

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Yup,

I can confirm, after switchin on the advanced properties,

the "Average Normals" turned up!

Thanks guys, a short test gave me a nice result, I think with that I will get a huge step further!

Regards

Heiner

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Ok,

now I am getting somewhere: Thats my latest Result and I must say that

it is pretty satisfactory im my opinion. What is still there in terms of uneveness

I think i can get rid of.

Thanks folks for the great help!

Regards

Heiner

AM_Problem0.jpg

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I see its all got sorted out now!

The heads looking good Heiner.

Didn't occur to me that 'Advanced Properties' being off would be a factor :blush:

I've posted a bug report about Average Normals and what should be visible and when.

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