Vectrosity5：Unity3D实时图形绘制指南

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" Vectrosity5 是一个针对Unity3D的插件，它允许开发者在游戏开发过程中实时绘制二维和三维图形。这个插件的新版本提供了丰富的功能和改进，以增强图形表现力和开发效率。" Vectrosity5 的核心功能在于其便捷的脚本接口，使得开发者可以轻松地进行编程操作。文档中详细介绍了如何使用Vectrosity进行脚本编写，建议初学者先查看`Scripts`文件夹中的示例脚本，以便直观地理解其工作原理。在Unity项目中导入 Vectrosity5 或 Vectrosity5 Source 包后，再导入 Vectrosity Demos 包，就可以开始探索和学习了。开始学习时，推荐从`Simple2DLine`和`Simple3DObject`场景入手，这两个场景包含了最基本的绘图功能。如果想在编辑器中实现线条绘制，可以查看`Vectrosity5 Documentation`文件获取更多信息。请注意，Vectrosity5 需要Unity 5.2.2或更高版本才能运行，对于使用Unity 4.6到5.1的用户，应使用 Vectrosity4.4 版本，而Unity 4.0至4.5版本则需要 Vectrosity 3.1.2。在基本线绘制（Basic Line Drawing）部分，文档会讲解如何使用`SetLine`和`SetRay`方法创建简单的线条。这两个方法是构建复杂图形的基础，能够帮助开发者快速创建出各种形状和路径。进一步深入，`VectorLineObjects`章节涵盖了VectorLine对象的详细内容，包括颜色、纹理和其他参数的设置。这使得开发者能够自定义线条的外观，如改变颜色以达到不同的视觉效果，或者应用纹理来增加图形的丰富度。在`Drawing Lines`部分，开发者将了解到如何在屏幕上动态绘制线条，这部分可能涉及到线条的定位、方向以及与场景其他元素的交互。此外，还可能涉及线条动画的实现，例如动态变化的线条长度、宽度或颜色。 Vectrosity5 是一个强大的工具，它为Unity开发者提供了一套直观且高效的2D和3D图形绘制解决方案。通过深入学习和实践提供的文档和示例，开发者能够掌握利用这个插件创建复杂图形和动画的技巧，从而提升Unity项目的视觉质量和用户体验。

Using maxWeldDistance

As mentioned above, the weld for certain line segments when using Joins.Weld can be cancelled. Namely, as

line segments get closer to being parallel, the weld points extend farther and farther from the actual line

segment joint:

This can lead to unwanted artifacts in some of the more extreme cases, as the weld point extends toward

infinity. To prevent that, VectorLines have a maxWeldDistance property, which looks at the weld point and

cancels the weld operation for a particular line segment if the weld distance is too far:

By default, this distance is twice the pixel width that the VectorLine was created with. So a line with a pixel

width of 20, for example, will have a default maxWeldDistance of 40. This can be changed at any time after the

line is created, like so:

myLine.maxWeldDistance = 100;

The smaller the maxWeldDistance, the smaller the angle at which the weld will be cancelled.

Additional options

In addition to the name, points, width, texture, LineType, and Joins, there are a number of other options that

you can specify after the VectorLine object is declared. These are less frequently used than the parameters you

supply when declaring a VectorLine, so for the sake of simplicity they aren’t included in the VectorLine

constructor. The additional options include: color, active, capLength, depth, layer, drawStart, drawEnd, and

more. These are detailed in the Line Extras section below. But first, let’s draw the line.

VECTORLINE OBJECTS

(continued)

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At last, we’ll actually draw a line! This is pretty simple: VectorLine.Draw. Just add Draw() to the VectorLine

object you’ve set up:

myLine.Draw();

Once a line is drawn, it’s persistent, so VectorLine.Draw doesn’t have to be called again unless the line

changes in some way. So Draw can generally be called from pretty much anywhere — in Update if you’re

updating the line every frame, otherwise just where needed.

A line drawn this way is drawn as an UI element in a canvas, so it overlays other objects in the scene. It

works with both Vector2 and Vector3 points.

If you need to draw lines that exist as objects in 3D space, then you can use Draw3D instead:

myLine.Draw3D();

Lines made with Draw3D can only use Vector3 points. See 3D Lines for more information on 3D line drawing.

It’s also possible to draw points instead of line segments. See Drawing Points for more information about

that.

“Free” anti-aliasing

It’s possible to get anti-aliased lines even if you don’t have FSAA set in Unity. This is especially helpful on

mobile devices, since FSAA might be too expensive there, depending on the device. To do this, you need to

use a material that uses a shader that has alpha texture support, such as Unlit/Transparent, or Particles/

Additive. Then you need a texture for this material that has transparent pixels at the top and bottom. The

VectrosityDemos package has several sample line textures; in this case ThinLine and ThickLine are good for

plain anti-aliased lines. ThinLine is simply a 2X4 pixel texture, with transparent pixels on the top and bottom

and solid white in the middle:

Make sure the texture is set to bilinear ﬁltering and not point. The line anti-aliasing works by taking

advantage of the inherent anti-aliasing you get when bilinear ﬁltering is used, as illustrated below:

Left: a close-up of a line using the default material and no FSAA. Right: the same line using the

Unlit/Transparent shader and the ThinLine texture, and still no FSAA. The AA comes from the texture

itself as the result of bilinear ﬁltering.

DRAWING LINES

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