How to load 3D models in OpenGL C++?

Question

I am trying to load 3D models. How do I to read the data in the model file?

For an example, this is the data:

VERTICES
80 21 32
32 34 17
14 93 56
33 54 87
MODEL_SCALE 5

I know the data in 3D models is not like this, but how will I read the 'vertex data' and the 'model scale amount'?

The best piece of advice is to get OpenCTM, that does mesh loading, etc. for you! — Pepe
– Pepe, Commented Aug 15, 2011 at 15:29

Heisenbug · Accepted Answer · 2011-08-14 10:48:18Z

8

OpenGL doesn't do this for you. You should write your own parser, store the readed datas into your defined data structures and use OpenGL primitives to render them.

Here's a nice tutorial.

answered Aug 14, 2011 at 10:48

Heisenbug

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10 Comments

CppOgl Over a year ago

Yes but how will I read the data? What I want to do is read the data of the file and draw vertices on them.

user786653 Over a year ago

It looks like milkshape is a binary format, which I'm not sure is applicable for OP as it looks like he's showing an example of a text format.

CppOgl Over a year ago

Hmm... seems quite helpful. But there is a way reading words with string.h and other stuff like that, right? I'll try to use that too. Anyway, thanks!

datenwolf Over a year ago

@CppOgl: FILE *filp = fopen(filename, "r"); fread(...), etc. Or in C++ using ifstream. This not an OpenGL question then, but a generic "how do I read a file" question.

Heisenbug Over a year ago

@user786653 : yes you are right. But like datenwolf pointed out, this is not an opengl question. The linked tutorial illustrate some basic operation and datastrutctures that one usually use while loading a model to be rendered with openGL primitives.

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