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AppGameKit Classic Chat / Question about UV's in .obj files

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blink0k
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Joined: 22nd Feb 2013
Location: the land of oz
Posted: 29th Nov 2017 00:47
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Why would an .obj file need two separate entries in the texture table (vt) with exactly the same co-ordinates?
Just trying to understand how it works
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nz0
AGK Developer
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Joined: 13th Jun 2007
Location: Cheshire,UK
Posted: 6th Dec 2017 01:12
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I'm guessing the obj format is fairly generic and basic.
I've been messing with vertex colour recently and though obj would be handy for editing the info by hand, but AppGameKit doesn't like loading obj vertex colours

Pity, as the obj file format is at least text, so we can mess with it.
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MikeMax
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Joined: 13th Dec 2011
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Posted: 6th Dec 2017 09:57 Edited at: 6th Dec 2017 09:59
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Specifically in Obj files, appgamekit (and only it) can accept 2 sets of UV in same vt line. 1st UV coords for texture 0; and second UV coords for texture 1 (lightmaps). 3D example "Metro theater" use this specific implementation of obj files for appgamekit. (I have a specific Obj export plugin for Ultimate Unwrap3D which supports it if the model/scene your convert has lightmaps .. thanks to the Unwrap3D author which has done it for me !).

But now i use my own B3D Loader which convert to OBJ for appgamekit with lightmaps support.
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blink0k
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Posted: 6th Dec 2017 18:38
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I have just spent some time going back and forth with the UU guy. He is a lot of help! The support is fantastic!
My obj file doesn't contain multiple textures though
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