glOrtho not working
glOrtho not working
我在使用GLM库的GLMDraw()函数绘制Google SketchUp 3D图像的程序中使用glOrtho时遇到了问题。我想在投影模式下只看到某些 z 值的图像,而 glOrtho() 似乎不起作用,所以我编写了以下代码来测试它:
glOrtho(0.0f, 2.0f, 0.0f, 2.0f, 0.0f, 0.0f);
由于近平面和远平面是相同的,我认为我不应该看到图像,但我看到了整个图像。我错过了什么?
如果使用 znear=zfar 调用 glOrtho,则会生成GL_INVALID_VALUE错误,并且可能只是丢弃调用。
http://www.opengl.org/sdk/docs/man/xhtml/glOrtho.xml
尝试为其指定一个大于零的范围。
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