[Bf-gamedev] vertex normals editing

[Michael Knubben]

Here are some more uses for that:
http://wiki.polycount.net/VertexNormal

Particularly for foliage, but there's also something called 'face weighted
normals', the effects of which can be achieved manually (though tediously)
but which a script can easily accomplish:
http://www.polycount.com/forum/showthread.php?t=85809

Bastien, do you feel you're familiar with the uses of this, or would you
like me to elaborate?

http://flickr.com/photos/michaelknubben/


On Tue, Oct 8, 2013 at 11:43 AM, Simon Broggi <simon.broggi at gmail.com>wrote:

> Hi Bastien,
>
> Great to hear that this topic is being worked over! Guess my approach was
> a bit naive ;)
>
> Tangent data editing: Perhaps this would be useful for anisotropic
> shading. Lately I had some problems finding a way to create a direction
> texture for a brushed metal shader. I ended up mixing gradients in
> different color channels together, not the artist friendly way ;)
> If tangent space was editable, this information could be stored in mesh
> data, and a texture would only be needed for higher resolution, right? And
> if we would find a nice way to edit it, this could be very handy. I'm not
> sure how often this would be used by artists though. Certainly the normals
> have higher priority.
> Here's the shader I was using:
> http://wiki.unity3d.com/index.php?title=Anisotropic_Highlight_Shader
>
>  Greetings, Simon
>
> On Mon, Oct 7, 2013 at 2:51 PM, Bastien Montagne <montagne29 at wanadoo.fr>wrote:
>
>>  Hi Simon,
>>
>> I’m currently working over this topic - but it is not a trivial one, we
>> have to be very careful with how we manages those custom normals… You can
>> have a look at my current working doc,
>> http://wiki.blender.org/index.php/User:Mont29/Foundation/Split_Vertex_Normals:)
>>
>> Best regards,
>> Bastien
>>
>>
>> On 07/10/2013 10:12, Simon Broggi wrote:
>>
>> Hello everyone,
>>
>>  I've made a python script to edit vertex normals.
>> https://github.com/simonbroggi/Blender-Smoothgroups
>>
>>  It lets the user assign some faces to a group. The normals connected to
>> a group of faces are then smoothed individually.
>>
>>  The simplest application of this script is to create a beveled cube
>> with correct vertex normals and a minimum amount of polygons. In this
>> image, the cube on the right is makes use of the script
>> http://simon.insert-coin.ch/blenderNormals.jpg
>>
>>  The script has some problems that make its use destroy workflow:
>> -Every time the user enters edit mode the edited normals are lost.
>>  -Modifiers recalculate the normals. It would be great to use the script
>> in combination with the edge split modifier, as this is another convenient
>> method to edit normals. Unfortunately the modifier ignores the normals and
>> recalculates everything.
>>
>>  These problems could be solved by implementing something similar in the
>> c code of blender. It would probably make sense to implement it as a
>> modifier. This would be a valuable tool for game artists.
>>
>>  Greetings, Simon
>>
>>  Simon Broggi
>> Aargauerstrasse 60 - 12
>> 8048 Zürich
>> +41 77 401 9115
>> http://simon.insert-coin.ch
>>
>>
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