[gameprogrammer] Re: Texture Coordinates

Hi Esam,

The application is a model creator.  I am putting it together to
create simple 3D models for use in games.  I have attached an example
model of a tank that I have created using my app and a copy of the
output file it generates.   I have also attached a screenshot of the
app (still using hand drawn GUI atm...)  This should give you an idea
of what the program is doing.  The reason for doing it is that I am
not really a designer.  I don't have 3DSMax and if I did I wouldn't
know how to use it.  If you look at the attached model you can see
there is quite a number of vertices.  I am already able to switch on
textures in the application but by the time I have manipulated the
vertices into position the texture coordinates are normally pretty
useless.  If there is a mechanism for automatically calculating a
"best fit" then this is what I think I need to do.  Maybe with some
manual fine tuning once this is done.  It would be interesting to know
how applications like 3DSMax handle this sort of thing.

I appreciate your feedback.

Rich

2009/7/22 Esam Bustaty <e.bustaty@xxxxxxxxxx>:
> Can you give us more idea about what does the application do??
> If you use 3DSMax there is many ways to assign texture coordinates (auto or
> manual), I think I can help making most of them, but I just need to
> understand what you need to help you with...
>
> ________________________________
> From: Richard Sabbarton <richard.sabbarton@xxxxxxxxx>
> To: gameprogrammer@xxxxxxxxxxxxx
> Sent: Thursday, 23 July, 2009 12:42:21 AM
> Subject: [gameprogrammer] Texture Coordinates
>
> Hi Guys,
>
> I am looking for some advice on how best to determine texture
> coordinates for vertices.  I have been developing a 3D model utility
> that can be used to create models for use in games and I am looking
> for the best way of setting up texture coordinates.  The model format
> is a simple array of vertices that are arranged into stacks of
> TRIANGLE_STRIPS.  Each vertex has an assigned set of Texture
> Coordinates.  I can create a new mesh, say a 4 vertex quad with
> texture coordinates assigned correctly.  I can then subdivide the mesh
> into 9 vertices and again into 25 vertices.  I don't have a problem
> preserving the texture coordinates during subdivision but when I start
> maniplulating the vertex coordinates it will stretch and skew the
> texture.  I have no issues with why this is occuring, I am just
> looking for advice on how best to manage texture coordinates.
>
> At the moment, the application allows you to select vertices and
> adjust the texture coordinates manually but I am sure there must be a
> better way of doing it that that...
>
> Any thoughts?
>
> Richard
>
>
> P.S. If anyone is interesting in assisting with some testing of this
> app then let me know.  I am thinking of making it freely available
> when completed if there is some interest.
>
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Attachment: tank.jpg
Description: JPEG image

Attachment: MeshCreator.jpg
Description: JPEG image

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