opengles在iphone中显示人脸 [英] opengles display human face in iphone

问题描述

我需要将人的 2D 人脸转换为 3D 人脸.我使用 其实是我的项目，感谢您使用它！

1) 实现完美纹理交换而不失真的唯一方法是，两个纹理都以完全相同的方式映射到 UV 顶点.看看下面的图片:

• 模型 A:

3) 我将在下一次更新中添加更多变换选项(缩放和平移).Xcode 项目实际上是为了展示 PERL 脚本，而不是作为 iOS 上 OpenGL ES 的入门.现在，找到 modelViewMatrix 并摆弄一下:

GLKMatrix4Scale(_modelViewMatrix, 0.30, 0.33, 0.30);

希望能回答你所有的问题！

I need to make a human 2D face to 3D face. I used this link to load an ".obj" file and map the textures. This example is only for cube and pyramid. I loaded a human face ".obj" file.

This loads the .obj file and can get the human face properly as below.

But my problem here is I need to display different human faces without changing the ".obj" file. just by texture mapping.

But the texture is not getting mapped properly, as the obj file is of different model. I just tried changing the ".png" file which is used as texture and the below is the result, where the texture is mapped but not exactly what I expected, as shown below.

The below are my few questions on it :

1) I need to load texture on same model( with same .obj file ) with different images. Is it possible in opengles?

2) If the solution for above problem is "shape matching", how can I do it with opengles?

3) And finally a basic question, I need to display the image in large area, how to make the display area bigger?

解决方案

mtl2opengl is actually my project, so thanks for using it!

1) The only way you can achieve perfect texture swapping without distortion is if both textures are mapped onto the UV vertices in exactly the same way. Have a look at the images below:

• Model A: Blonde Girl
• Model B: Ashley Head

As you can see, textures are made to fit the model. So any swapping to a different geometry target will result in distortion. Simplified, human heads/faces have two components: Interior (Bone/Geometry) and Exterior (Skin/Texture). The interior aspect obviously defines the exterior, so perfect texture swapping on the same .obj file will not work unless you change the geometry of the model with the swap.

2) This is possible with a technique called displacement mapping that can be implemented in OpenGL ES, although with anticipated difficulty for multiple heads/faces. This would require your target .obj geometry to start with a pretty generic model, like a mannequin, and then use each texture to shift the position of the model vertices. I think you need to be very comfortable with Modeling, Graphics, Shaders, and Math to pull this one off!

• Via Wikipedia

3) I will add more transform options (scale & translate) in the next update. The Xcode project was actually made to show off the PERL script, not as a primer for OpenGL ES on iOS. For now, find the modelViewMatrix and fiddle with this little bit:

GLKMatrix4Scale(_modelViewMatrix, 0.30, 0.33, 0.30);

Hope that answers all your questions!

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