glOrthof和glViewPort的区别 [英] Difference between glOrthof and glViewPort

问题描述

基于OpenGL-ES我很困惑的区别是设置之间有什么

On OpenGL-ES i'm confused on what the difference is between setting

glOrthof()  
glViewPort()
GLU.gluOrtho2D()

与它的各个参数。因为我相信这是所有设置部分，你可以看到到指定的坐标（宽，高）。我应该使用哪一个？

with it's respective parameters. Since I believe it's all setting the part you can see to the specified coordinates (width, height). Which should I use?

推荐答案

在 glViewport determins窗口部分到OpenGL中绘图。这可能是整个窗口，或第（认为单机游戏的分屏模式 - 不同的视每一个球员）。

The glViewport determins the portion of the window to which OpenGL is drawing to. This may be the entire window, or a subsection (think console game's "split screen" mode- a different viewport for every player).

glOrthof 施加的正投影以当前矩阵，这是通常设置为投影矩阵此呼叫之前。投影矩阵结合模型视图，以产生一个矩阵，可将您的OpenGL坐标到屏幕坐标。

glOrthof applies an orthographic projection to the current matrix, which is usually set to the projection matrix before this call. The projection matrix is combined with the modelview to produce a matrix that translates your OpenGL coordinates to screen coordinates.

gluOrtho2D ，

这是相当于调用glOrtho附近= -1，远= 1。

This is equivalent to calling glOrtho with near = -1 and far = 1.

我建议此页如何查看和改造工作在OpenGL的更多细节。

I'd recommend this page for more details on how viewing and transformation works in OpenGL.

您应该使用哪个？视口和正投影有不同的关注点，所以你需要呼吁每个。 glOrthof和gluOrtho2D是大致相当;知道的差，并使用一个或另一个。

Which should you use? Viewports and orthographic projections are different concerns, so you'll need a call for each. glOrthof and gluOrtho2D are roughly equivalent; know the difference and use one or the other.

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