Normal map error with normals

[tiagodmed]

I think this may actually be a bug, I'll attach the file that did the tests for investigation.





https://dl.dropboxusercontent.com/u/2067306/corona_report/bug_normal%20map.zip

[Ondra]

What is the problem? The faceting on the terminator line?

[tiagodmed]

Yes, when I use "normal map" the shadow is faceted, as if not smoothed the surfaces.

This is the correct result.

[tiagodmed]

I tried to put the gamma at 2.2, the render is not correct but the error did not show up, is not it something with the color space?

[maru]

I tried to put the gamma at 2.2, the render is not correct but the error did not show up, is not it something with the color space?

You changed gamma where?

[lacilaci]

you get rid of the terminator effect by increasing subdivisions on your model... But I don't get how gamma could affect this (maybe hiding the effect in dark areas :D).

[tiagodmed]

maru: Using "Color Correction", as you turn to advanced mode and will have the option to change the gamma.
About my previous comment, I confuse, in realy I made ​​a de-gamma, as the texture is 8bit she is not linear, this gamma 2.2 was embedded. The Normal map shader of Corona asks for it not be done, as I said the render is wrong but the problem disappears, which made ​​me think that may be associated with the color space.

lacilaci: I have not changed the subdivisions of the model, when we use normal map subdivisions should not interfere with the final result, remember that it is used also in low poly models. And the gamma is directly connected to the correct result of the normal map, when working with 3ds max linearized you need to make a de-gamma in texture of normal map for it to work properly.

I even tried to use a texture linearized but had no effect,  I prefer no more try guessing the problem, kkkkkkkkkkkk

[Ondra]

hmm... can you render me the "normal difference" pass for both cases?

[tiagodmed]

Project with 8bit texture:
https://dl.dropboxusercontent.com/u/2067306/corona_report/bug_normal%20map.zip

Linearized texture:
https://dl.dropboxusercontent.com/u/2067306/corona_report/BrickSmallNew01_Nmap-linearized.rar

[lacilaci]

so no matter what ammount of subdivisions you use it shows the terminator effect?

This is what i've got..

what build do you use?

[tiagodmed]

lacilaci, what happens is that when you increase the subdivision the error starts to become imperceptible, because it happens on the faces of the object, as the smaller the face unless the error will appear.
But if you have to increase subdivision of the object to be certain it no longer makes sense to use normal map, in which case you use a displacement.

By the way, I'm not using any build

[lacilaci]

Oh, i get it... You are actually trying to get rid of shadow terminator using normal map, right?

[tiagodmed]

Keymaster: Sorry I forgot the render pass you asked, I did all passes of normals and the "normal geometry" realizes the "faceted"

normalsDiscrepancy


normalsDotProduct


normalsShading


normalsGeometry

[Ondra]

ok, everything looks normal. I'll take a look once I get it working again

[tiagodmed]

ok, I stopped making assumptions, kkkkkkkkkkkk :P

[rafpug]

Good evining


Hello tiagodmed

This is the effect you wanted?
a softer shadow?


Greats
Raf

[rafpug]

lacilaci, what happens is that when you increase the subdivision the error starts to become imperceptible, because it happens on the faces of the object, as the smaller the face unless the error will appear.
But if you have to increase subdivision of the object to be certain it no longer makes sense to use normal map, in which case you use a displacement.

By the way, I'm not using any build

you can post an example?

Thanks
Raf

[tiagodmed]

In real I've posted on the first page, but to pinpoint the error, here is wrong and right.

[rafpug]

yes

[rafpug]

How come you use a teapot with segments 5 - 10?

is there a reason?

[rafpug]

There are other methods for dividing the surface of 5 segments
Editable poly/subbdivision surface

The aliasing effect disappears unlike Meshsmooth and TurboSmooth

[lacilaci]

Normal mapping cannot fix shadow terminator effect. Or can it??? http://blog.irayrender.com/post/29042276644/shadow-acne-and-the-shadow-terminator

[tiagodmed]

Normal mapping cannot fix shadow terminator effect. Or can it??? http://blog.irayrender.com/post/29042276644/shadow-acne-and-the-shadow-terminator

Damn it, that was what I feared!

And at the end he says exactly what I mentioned, if you have to increase subdivision to minimize the problem is better now to use displacement.

[Vanya]

Hi friends, today something that did not work, the problem of map in the map itself.

[rafpug]

Hello Vanya

3dsmax .. version?

[rafpug]

Normal mapping cannot fix shadow terminator effect. Or can it??? http://blog.irayrender.com/post/29042276644/shadow-acne-and-the-shadow-terminator

Damn it, that was what I feared!

And at the end he says exactly what I mentioned, if you have to increase subdivision to minimize the problem is better now to use displacement.

ahahah tiagodmed...you are strong!

[Vanya]

Hello Vanya

3dsmax .. version?

3dsMax 2012 Design

I have a question off topic, the Corona does BAD work on dual processors ??

[tiagodmed]

Hi friends, today something that did not work, the problem of map in the map itself.

I don't understand what you did, it seems like you tried to put a normal map shader within the normal map shader, was that?
I can not imagine a reason to do so, does not make sense, within the normal map shader you must put a bitmap normal map, or substance shader from normal map.

[Vanya]

I don't understand what you did, it seems like you tried to put a normal map shader within the normal map shader, was that?
I can not imagine a reason to do so, does not make sense, within the normal map shader you must put a bitmap normal map, or substance shader from normal map.

Yes, the first time I accidentally put the "normal map" into the "normal map" //
But I know what and where to insert ;)
This is not normal ! in 'mentalray' 'vray' 'and in all other rendering programs' you can insert the "normal map" in a "normal map" many many time, as you may have noticed, then this card is broken.

[Ondra]

I took a look at the original problem, and it is just the standard terminator issue, because the bump map actually has small details on it. You need to just increase subdivisions of the geometry

[kumodot]

   Corona 1.2.1 and Max 2016, corona is just ignoring any "Render Iters" on Turbosmooth modifier. It only render correctly if i put Viewport Iters High.(But this is heavy to work this way. :(