How we use indices when vt or vn index is omitted.

[monguri]

Hi syoyo.
Thanks for your project. I have referred your code for my project MGRRenderer.

I have one question for it.
In updateVertex(), you have not registered the normal value to normals in case normal index is omitted such as 1//3, this is same as textures, therefore it looks that indices exist only for positions but not for normals or textcoords in mesh_t

Therefore I have no way to use glDrtawElements of OpenGLES2 when normal and textcoords do not exist.

[syoyo]

You can just fill dummy value(or compute geometric normal) when normals.size() == 0 or texcoords.size() == 0, for example:

https://github.com/lighttransport/nanort/blob/master/example/main.cc

[monguri]

Thank you for reply!

I want to know the way when some face element is complete format i/j/k and another is omitted fomat i//k in same material group, too.

Is it the improbable?
Sorry, I don't know obj specification sufficientry.

[syoyo]

First, you should investigate .obj specification so that your .obj data is correct or not.

Then, it would be better to take a look at @chrisliebert's https://github.com/chrisliebert/sdlgl3-wavefront

[monguri]

I found obj specification.
The case such as f 1/2/3 1//4 2/3/5 is illegal.
The way to omit normal or texcoord have to be consistent.
http://www.cs.utah.edu/~boulos/cs3505/obj_spec.pdf
b1-16

I read renderer of chrisliebert too.

I very thank you for your replies.

[syoyo]

Cool! > spec.

And you can send PR of reporting error for such an inconsistent/illegal input.

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[arash009]

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[syoyo]

Ah, the posted bounty was just an testing purpose and invalid. We can remove it and allocate new valid bounty.