blocks|key|565110|text|你知道，OpenGL不仅仅是用于游戏，还有其他类型的程序，而不仅仅是游戏。想想CAD程序，或地图编辑器，在那里线框仍然是非常有用的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|565111|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You know, OpenGL is not just for games and there are other kind of programs than just games. Think CAD programs, or map editors, where wireframes are still very usefull.

blocks|key|2144393|text|GL_POINTS在游戏中用于点精灵(通过点精灵功能或从几何图形着色器中的一个点生成一个四角体)，两者都用于“闪光”效果和体积云。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2144394|它们也被用于一些特殊的算法，就在.当需要点的时候。如在构建柱状图中的几何图形着色器，如本章中的一章后来的GPU宝石书籍。或者，对于GPU实例，通过转换反馈剔除。|2144395|GL_LINES在游戏中几乎没有什么用处(主要用于CAD或建模应用程序)。除了经常不需要，如果需要的话，通常需要厚度大于1的线，这在所有实现上都不是很好的支持(读为:+fast)。|2144396|在这种情况下，通常用三角形条画粗线。|2144397|entityMap^0|0|9|0|0|0|8|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Q|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|U|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|M|$]]

<code>GL_POINTS</code> are used in games for point sprites (either via the pointsprite functionality or by generating a quad from a point in the geometry shader) both for "sparkle" effects and volumetric clouds. 
They are also used in some special algorithms just when, well... when points are needed. Such as in building histograms in the geometry shader as by the chapter in one of the later GPU Gems books. Or, for GPU instance culling via transform feedback.

<code>GL_LINES</code> have little use in games (mostly useful for CAD or modelling apps). Besides not being needed often, if they are needed, you will normally want lines with a thickness greater than 1, which is not well supported (read as: fast) on all implementations. 
In such a case, one usually draws thick lines with triangle strips.

blocks|key|2144316|text|谁说过那些原始人被用于现代游戏？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2144317|在三维建模工具中，GL_LINES对于线框视图至关重要。|2144318|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Who ever said those primitives were used in modern games?

GL_LINES is critical for wireframe views in 3D modeling tools.

blocks|key|2163500|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2163501|+(哪里)是OpenGL中的点和线基元仍然在现代游戏中使用？|blockquote|2163502|2163503|2163504|你想把它们用在哪里？|2163505|在标准方法下，点可以用来建立点精灵，这是二维平面卡，总是面对着相机，并有一个特定的大小。在窗户空间里，它们总是方形的.遗憾的是，OpenGL规范使使用它们变得有些可疑，因为点精灵是根据点的中心而不是用于渲染它的两个三角形的大小来裁剪的。|2163506|画线是完全合理的。很久以前，在消费硬件中没有线路，但是它们已经存在了很多年了。当然，反别名线绘制(GL_LINE_SMOOTH)是另一回事。|2163507|更重要的是这些东西与几何图形的交互作用。你可以把点转换成一个四边形。或者三角形。或者任何你想要的，真的。每个“点”只是几何图形着色器的执行。你可以有包含球的位置和半径的点，而几何图形着色器可以输出一个窗口对齐的四边形，这是碎片着色器在上面做一些射线跟踪逻辑的合适大小。|2163508|GL_POINTS的意思只是“每个几何图形着色器一个顶点”。GL_LINES的意思是“每个几何图形着色器有两个顶点”。你如何使用它取决于你自己。|2163509|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|R|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|S|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|T|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|U|7|@]|8|@]|9|$]]|$1|F|3|G|4|5|6|V|7|@]|8|@]|9|$]]|$1|H|3|I|4|5|6|W|7|@]|8|@]|9|$]]|$1|J|3|K|4|5|6|X|7|@]|8|@]|9|$]]|$1|L|3|M|4|5|6|Y|7|@]|8|@]|9|$]]|$1|N|3|O|4|5|6|Z|7|@]|8|@]|9|$]]|$1|P|3|-4|4|5|6|10|7|@]|8|@]|9|$]]]|Q|$]]

<blockquote>
 (Where) are point and line primitives in OpenGL still used in modern games?
</blockquote>

Where do you want them to be used?

Under standard methods, points can be used to build point sprites, which are 2D flatcards that always face the camera and are of a particular size. They are always square in window-space. Sadly, the OpenGL specification makes using them somewhat dubious, as point sprites are clipped based on the center of the point, not the size of the two triangles that are used to render it.

Lines are perfectly reasonable for line drawing. Once upon a time, lines weren't available in consumer hardware, but they have been around for many years now. Of course, antialiased line rendering (GL_LINE_SMOOTH) is another matter.

More importantly is the interaction of these things with geometry shaders. You can convert points into a quad. Or a triangle. Or whatever you want, really. Each "point" is just an execution of the geometry shader. You can have points which contain the position and radius of a sphere, and the geometry shader can output a window-aligned quad that is the appropriate size for the fragment shader to do some raytracing logic on it.

GL_POINTS just means "one vertex per geometry shader". GL_LINES means "two vertices per geometry shader." How you use it is up to you.

blocks|key|2144382|text|我想说的是为了调试目的，但这只是从我自己的角度。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2144383|有些原语可以在你认为不能应用的地方使用，比如粒子系统。|2144384|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I'd say for debugging purposes, but that is just from my own perspective. 

Some primitives can be used in areas where you don't think they can be applied, such as a particle system.

blocks|key|565969|text|我同意Pompe关于行对调试有用的说法。它们在调试AI和碰撞检测算法时非常有用，这样您就可以可视化AI或冲突检测所使用的数据。一些实例用于人工智能，这些线可以用来表示AI路径或路径网格。线可以用来显示人工智能正在使用的转向数据。线可以用来显示人工智能的目标。所显示的数据可以以文本形式显示，但有时以可视形式显示比较容易。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|565970|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I agree with Pompe de velo about lines being useful for debugging. They can be useful when debugging AI and collision detection algorithms so that you can visualize the data that is being used by the AI or collision detection. Some example uses for AI, the lines can be used to show AI paths or path meshes. Lines can be used to show steering data that the AI is using. Lines can be used to show what an AI is aiming at. The data that is shown can be displayed in text form but sometimes it is easier to see it in visual form.

blocks|key|2144526|text|在大多数情况下，粒子是基于GL_POINT的，考虑到屏幕上有大量的粒子，使用每个粒子的4个顶点是非常昂贵的，所以GL_POINT解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2144527|GL_LINES良好的调试目的，线框模式可用于各种情况。如前所述-在CAD应用程序中，但如果你是在游戏开发中使用-它是一个好的场景编辑器。|2144528|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

In most cases particles are based on GL_POINT, considering that there can be a huge number of particles on the screen it would be very expensive to use 4 vertices per particle, so GL_POINT solves this problem

GL_LINES good for debugging purposes, wireframe mode can be used in various cases. As mentioned above - in CAD apps, but if you're interesed in gamedev use - it's good for a scene editor.

blocks|key|2144566|text|在碰撞检测方面，当您想要在线框模式下可视化边界卷(框、球、k-dops)和接触流形时，它们就会派上用场。根据碰撞的状态设置这些原语的颜色也是非常有用的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2144567|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In terms of collision detection, they come in handy when you want to visualize bounding volumes(boxes,spheres,k-dops) and contact manifolds in wireframe mode. Setting the colour of these primitives based on the status of collisions as well is incredibly useful.

I've been using OpenGL since some time now for making 3D applications, but I never really understood the use of the GL_POINT and GL_LINES primitive drawing types for 3D games in the production phase.

<ul>
<li>(Where) are point and line primitives in OpenGL still used in modern games?</li>
</ul>

GL_POINT and GL_LINES - real use?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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从一段时间以来，我就一直在使用OpenGL制作3D应用程序，但在生产阶段，我从未真正理解GL_POINT和GL_LINES基本绘图类型在3D游戏中的使用。(Where)是OpenGL中的点和线基元，在现代游戏中仍然使用？。

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