javascript - 在立方体贴图内映射等矩形正方形切片| Javascript / Python(Map an equirectangular square slice inside cubemap | Javascript/Python)

Question

I'm trying to map a square slice of an equirectangular image inside a cubemap with 6 faces, without distortion.

(我正在尝试在具有6个面的立方体贴图中映射等角矩形图像的正方形切片，而不会发生变形。)

The point is that I'm dealing with huge array sizes if I try to project the whole equirectangular texture (because the circumference is Earth-like), so I'm cutting it into pieces on demand, with a higher detail.

(关键是，如果我尝试投影整个等矩形纹理（因为圆周像地球一样），那么我将处理巨大的数组大小，因此我将根据需要将其切成碎片，并提供更高的细节。)

I need to convert/project this square image (512*512px) which is covering 0.08° of the 360*180 degrees that the equirectangular image provides.

(我需要转换/投影这个正方形图像（512 * 512px），该图像覆盖等矩形图像提供的360 * 180度的0.08°。)

The total circumference is 4407500mts.

(总周长为4407500mts。)

and the offset is 34.5° Lat and 56.8 ° Lon.

(偏移为34.5°纬度和56.8°纬度。)

(These values would change, but not the circumference)

(（这些值会改变，但周长不会改变）)

Can you help me to find a way to project that image onto a cubemap?

(您能帮我找到一种将图像投影到立方体贴图上的方法吗？)

I already have an algorithm to make a cubemap from the full equirectangular image but can't find a way to do the same with just a squared portion of it.

(我已经有一种算法可以从整个等角矩形图像制作一个立方体贴图，但是找不到一种方法可以仅用它的平方部分来做同样的事情。)

Thanks!

(谢谢！)

  ask by user12451423 translate from so

Answer 1

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