Java LWJGL OpenGL将3d点转换为2d点 [英] Java LWJGL OpenGL convert 3d point to 2d point

问题描述

我正在尝试将OpenGL中的3d点转换为屏幕上的2d点，以渲染我正在编写的一款小游戏的健康栏.但是，在检索在何处绘制运行状况栏的x坐标时遇到了一些麻烦.基本上，健康栏必须看起来在播放器上方，但相对于屏幕必须始终具有相同的宽度/高度.

I'm trying to convert a 3d point in OpenGL to a 2d point on screen to render a healthbar for a little game I'm writing. However, I'm having some trouble retrieving the x coordinate of where to draw the healthbar. Basically, the healthbar must appear to be above a player, but must always have the same width/height relative to the screen.

我在似乎 可以很好地与y坐标配合使用，但是，无论角度如何，x始终返回0.

It seems to work fine with the y coordinate, however, x always returns 0 no matter what the angle is.

非常感谢！

推荐答案

screenCoords.get(3)应该为screenCoords.get(0)，因为x位置存储在索引0中.实际上，您实际上只需要screenCoords的容量为3个浮点数，而不是4.

screenCoords.get(3) should be screenCoords.get(0) because the x position is stored at index 0. You also only actually need the capacity of screenCoords to be 3 floats, not 4.

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