yaorongzhen123的专栏

I was studying the rendering pipeline and when I got to the clipping stage it was explained thatfrom the view (eye or camera) space we have to pass to the clip space, also callednormalized device space(NDC), that is a cubic space from -1 to 1.Howe...

Vector Calculus: Understanding the Cross ProductTaking two vectors, we can write every combination of components in a grid:This completed grid is theouter product, which can be separated int...

左右手坐标系众所周知，OpenGL使用的是右手坐标系，而Direct3D使用的是左手坐标系。除了上面Z轴的方向不一样外，左右手坐标系的还有其他区别：正向旋转方向：在左手系中用Left-Hand Rule判别，正方向是顺时针方向。在右手系中，用Right-Hand Rule判别，是逆时针方向。叉积的方向：在右手坐标系中，叉积的方向通过Right-Hand Rule确定，而在...

One of thelinksyou posted provides a method, and two equations describing how to calculate the offset matrix. See the section titledBack into Initialization - The Offset MatrixI.e., one of the...

原文地址：http://blog.youkuaiyun.com/ichild1964/article/details/9728357参考：http://www.gamedev.net/topic/598985-gl-normalmatrix-in-glsl-how-to-calculate/当用glsl传normal到fragment的时候总要用gl_Normal* gl_NormalMatri...

shadow map技术中经常出现的一个问题就是，当放大阴影的边缘时会出现锯齿状的边界，如下图：出现这种现象的原因是shadow map的分辨率有限，场景中的相邻的多个fragment会sampler shadow map中的同一个texel,也就是会获取到相同的深度值，于是阴影就产生了这种参差不齐的锯齿状的边界。 你可以增加shadow map的分辨率来减轻这种状况，但会增加内存的消...

研究过shadow mapping技术的人应该都知道shadow map会有一种叫self-shadowing（有的文章也叫shadow acne）的问题，如下图所示：因为shadow map的精度有限，当要渲染的fragment在light space中距Light很远的时候，就会有多个附近的fragement会samper shadow map中同一个texel,但是即使这些frag...

一直想从底层开始写一个简单的游戏引擎，至于多底层，不好界定，目前来看就是自己直接调用用dx11或opengl api那个层面吧，这种想法很久了，但是游戏引擎方面的技术问题太多了，单说一个渲染引擎来说，各种技法，对想自己写着玩的就足够折腾好几年了吧？最近这段有时间，所以静下心来一步一步来吧，打算先把骨骼动画这块整出来，目标是3dsmax模型动画导出到动画模型解析显示都来自己做，这样能比较系统详细的理...

There's a good presentation about this:Don't Throw It All Away: Efficient Buffer Managementby John McDonald at NVIDIA. It covers various topics, but on the subject of your question, the general advi...

DirectX11 XMVECOTR&XMMATRIX用法详解初探DX11的数学库：向量XMVECOTR，矩阵XMMATRIX｜XMVECTOR（XNA数学库的向量）DirectX中的一个核心数据类型为XMVECTOR对它的运算可以使用SIMD指令集加速（主要处理向量的运算）。SIMD即Single Instruction Multiple Data，单指令多数据流，能够...

Half-Pixel Offset in DirectX 11There is a problem graphics programmers often have to face known as half-pixel/half-texel offset. In Direct3D 9 the probably most official article about it wasDirectl...

这段资料比较清晰的描述了computer shader中线程组线程数相关的概念。numthreadsDefines the number of threads to be executed in a single thread group when a compute shader is dispatched (seeID3D11DeviceContext::Dispatch).n...

在阅读NVIDIA samples的shader源码时，看到了这样一段注释：//Compute gradient using ddx/ddy before any branching那么上面这段注释怎么理解呢？pixel shader 好像是在SM3.0(准确的应该是sm2.x及以后的版本)后提供了ddx和ddy来计算pixel相关属性(如纹理坐标等)的导数功能的函数，这个功能是怎么实...

调用XMMatrixTranslation(2.0f, 3.0f, 4.0f)生成的矩阵为：1.0, 0.0, 0.0, 0.0,0.0, 1.0, 0.0, 0.0,0.0, 0.0, 1.0, 0.0,2.0, 3.0, 4.0, 1.0,其在内存中的表示为连续的 16 个元素，记录顺序为行从上到下，行内元素从左到右（ row_major 排列方式 ）。 变换向量...

Geometrical data is passed to the graphics hardware in the context of a threedimensionalspace. One of the jobs performed by the graphics hardware is to transform this data into geometry that ca...

AREA OF A MESH FACE IN C# IN GRASSHOPPERJames Ramsden | 26 March 2015 | Grasshopper | No CommentsAnother quick script for handing meshes – this time to find the area of a mesh face.This script...