# 简介
一个C++写的渲染管线,通过像素点绘制的方式,实现线框、填充、纹理的显示。给定局部坐标,可以转换到世界坐标、在转换到相机坐标,通过透视投影的方式显示到屏幕上。
界面基于Qt5.9,开发平台是Visual Studio 2017
该软件理论上可以绘制任意平面构成的空间立体,实现了环境光和Lambert散射光照模型,也可以扩展接口实现更加复杂的光照。
平面画线使用DDA算法,有相关接口,可以拓展其他的算法。
本项目的转换矩阵是分开的,即先进性局部转换到世界的矩阵变换,然后是世界到相机,最后是相机到投影平面。如果需要可以自己改造一下,先进行矩阵乘法,然后统一转换。
裁剪算法在底部还有一个bug,导致图形裁剪不规则,需要后续的修正。
存在一些小的bug,留作后续修正,主要是屏幕中心线的地方有一条黑线,这是渲染时候的浮点数误差,但是没找到彻底的解决方案。
# 使用方式
win run文件夹中直接双击运行即可。暂时没有Mac和Linux版本的,可以自行编译。旋转的正方向是从轴的负方向看向正方向时,顺时针方向。
空格:切换显示模式
Q W E R T Y 是物体平移的,3个轴总共6个方向
A S D F G H 是物体坐标系旋转的,3个轴总共6个旋转
Z X C V B N 是移动摄像机的,暂时只定义了摄像机平移
线框模式:
![](./pic/frame.png)
填充模式:
![](./pic/fill.png)
纹理贴图模式:
![](./pic/texture.png)
# 关于测试
留出了基本的单元测试接口,可以实际进行测试。数学库部分经过了严格的单元测试。但是其他模块由于精力有限,无法进行全面的测试了。尤其是裁剪的地方,需要更加严格的测试。
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