程序行星、高度图和纹理
我目前正在研究 OpenGL 程序行星生成器。我希望将它用于太空角色扮演游戏，这样玩家就不会深入到行星表面，所以我忽略了任何与 ROAM 相关的内容。目前，我正在绘制一个带有 VBO 的立方体并映射到一个球体上，如下所示此处。
我熟悉大多数分形高度图生成技术，并且已经实现了我自己的中点位移版本（我知道在这种情况下没那么有用）。
我的问题是，按程序生成高度图的最佳方法是什么。我看过 libnoise 它允许我制作可平铺的高度图/纹理，但据我所知可以看到我需要生成一个像这样的网络：
使平铺明显。
有人可以建议我最好的路线吗？
任何意见将不胜感激。
谢谢，
亨利。
I am currently working on an OpenGL procedural planet generator. I hope to use it for a space RPG, that will not allow players to go down to the surface of a planet so I have ignored anything ROAM related. At the momement I am drawing a cube with VBOs and mapping onto a sphere as shown here.
I am familiar with most fractal heightmap generating techniques and have already implemented my own version of midpoint displacement(not that useful in this case I know).
My question is, what is the best way to procedurally generate the heightmap. I have looked at libnoise which allows me to make tilable heightmaps/textures, but as far as I can see I would need to generate a net like:
Leaving the tiling obvious.
Could anyone advise me on the best route to take?
Any input would be much appreciated.
Thanks,
Henry.
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看来您了解生成平坦、无缝表面然后尝试将其映射到球体上的问题。
改用 3D 噪声函数怎么样？ 3D 噪声函数采用 3 个坐标而不是 2 个坐标作为输入，因此想象一个充满生成数字的 3D 数组（而不是 2D 数组）。因此，一旦有了 3D 噪声函数，您就可以生成 2D 纹理，但不是对每个像素使用 2D 坐标，而是使用该像素在球体上的位置的 3D 坐标。 （我希望这个复杂的句子有意义！）
看看这个关于柏林噪音的页面的中间部分：https://web.archive.org/web/20120829114554/http://local.wasp.uwa.edu.au/~pbourke /texture_colour/perlin/
我认为它准确地描述了您对球体的需求。
It looks like you understand the problem with generating a flat, seamless surface and then trying to map it onto a sphere.
How about using a 3D noise function instead? A 3D noise function takes 3 coordinates instead of 2 as its input, so imagine a 3D array full of generated numbers (instead of a 2D array). Thus, once you have a 3D noise function, you can generate a 2D texture, but instead of using 2D coordinates for each pixel, use the 3D coordinates of where that pixel would be on the sphere. (I hope that convoluted sentence made sense!)
Take a look at halfway-down this page about Perlin noise: https://web.archive.org/web/20120829114554/http://local.wasp.uwa.edu.au/~pbourke/texture_colour/perlin/
I think it describes exactly what you want with regards to spheres.
您可能还想查看 2004 年发表的这篇文章，了解如何将球体“拆分”为可管理的部分。
http://www.gamedev.net/reference/articles/article2074.asp
You may also want to check out this article from 2004 on how to 'split' up a sphere into manageable parts.
http://www.gamedev.net/reference/articles/article2074.asp