如何动画在OpenGL 3D模型（目）？ [英] How to animate a 3d model (mesh) in OpenGL?
问题描述
我想动画的模型（例如人类，步行）在OpenGL。我知道有这样的东西骨骼动画（与棘手的数学），但对于这个....
I want to animate a model (for example a human, walking) in OpenGL. I know there is stuff like skeleton-animation (with tricky math), but what about this....
- 创建在搅拌机模型
- 在搅拌机该模型创建一个骨架
- 现在，做一个行走动画搅拌机与模型和骨架
- 采取一些动画关键帧，每一个关键帧导出为一个单一的模式
（例如，作为OBJ文件） - 请对OpenGL的OBJ文件加载器（获得顶点，纹理，正常和面部数据）
- 使用一个VBO绘制在OpenGL的动画模型（并得到一些棘手的想法如何改变目前的关键帧的VBO /模型......也许一些与
glMapBufferRange
- Create a model in Blender
- Create a skeleton for that model in Blender
- Now do a walking animation in Blender with that model and skeleton
- Take some "keyFrames" of that animation and export every "keyFrame" as a single model (for example as obj file)
- Make an OBJ file loader for OpenGL (to get vertex, texture, normal and face data)
- Use a VBO to draw that animated model in OpenGL (and get some tricky ideas how to change the current "keyFrame"/model in the VBO ... perhaps something with
glMapBufferRange
好吧，我知道这个想法仅仅是一个小脚本，但它是值得探讨进一步？
什么是一个很好的概念，以改变关键帧/车型在VBO？
Ok, I know this idea is only a little script, but is it worth looking into further? What is a good concept to change the "keyFrame"/models in the VBO?
我知道，内存的问题，但与小模型（并没有太多的动画），这是可以做到的，我想。
I know that memory problem, but with small models (and not too much animations) it could be done, I think.
推荐答案
是的，你是指该方法在早期的3D视频游戏（地震等）非常受欢迎。
Yes, the method you are referring to was very popular in early 3D video games (quake, etc).
我建议实施它略有不同，那么你描述。而不是出口关键帧动画的每一个可能的框架。导出多个S $ P $垫出来键和插值顶点位置。这将允许更平滑的播放与显著使用更少的内存。
I would suggest implementing it slightly differently then you described. Instead of exporting a keyframe for every possible frame of animation. Export more spread out keys and interpolate the vertex positions. This will allow much smoother playback with significantly less memory usage.
这将需要只是一个单一的（流媒体，或动态）VBO。每个帧你会发现previous和下一个关键帧，内插的顶点，并将结果上载到VBO
This would require just a single (streaming, or dynamic) VBO. Each frame you would find the previous and next keyframes, interpolate the vertices, and upload the result into the VBO.
实际上，你可以设置搅拌机场景的每一帧导出为OBJ。然后自定义工具可以编译这些文件到一个不错的动画格式。
You can actually setup blender to export every frame of a scene as an OBJ. A custom tool could then compile these files into a nice animation format.
在这里阅读：
http://en.wikipedia.org/wiki/MD2_(file_format）
http://tfc.duke.free.fr /coding/md2-specs-en.html
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