Netherlands
Joined: Sep 26, 2009
Post Count: 3950
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Applying a texture in an OBJ file
Ladies and gentlemen,
While playing around with the one-sided box, I decided to try and make a box where textures will be correctly aligned on all visible faces.
Using the one-sided box as a template, I made several "new" boxes with 6 separate faces, trying to manipulate the way textures are applied. However, every time I import the OBJ in SH3D, the textures are applied the same way.
After comparing several OBJ files, I found that the difference with a standard box and a textured box lies in the "vt" and "f v/vt/vn" values. - In a standard box the "vt" value is omitted because there is no texture, so the we get "f v//vn". - In a textured box the "vt" value is specified twice and in different ways. Once separately as "vt" and once within the "f" value "f v/vt/vn".
From the data in the OBJ file with texture, I can clearly see that the separate "vt" statement is connected to the size of the texture relative to the size of the object. Does this statement have a second function?
A box with 6 faces (defined in a slightly different way as the standard SH3D box) gives these values when a texture is applied: f...1/1/1...2/2/1...3/3/1 f...1/1/1...3/3/1...4/4/1
A standard SH3D box gives slightly different values when a texture is applied: f...1/1/1...2/2/1...3/3/1 f...4/4/1...1/1/1...3/3/1
(Dots entered for clarity, as the forum software doesn't allow multiple spaces.)
Is this difference significant? In both cases the textures are applied correctly only on 3 of the visible sides.
The main questions, then, are: - Which value(s) should be changed when designing a 6-faced cube in order to change the way textures are oriented on a specific face? - Can this be defined in an OBJ file in such a way that a general purpose box is defined to which users can apply (in SH3D!) a texture that will always be oriented in the same way on 4 faces of the box?
I hope I explain myself clearly.
Hans
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Hans
