Introduction to my galaxy engine 8 : Real Time Fluid Rendering
Introduction to my galaxy engine 8 : Real Time Fluid Rendering最近正在研究real time fluid effect方面的问题，主要适用于液体，烟雾，火焰方面的实时模拟。一般是通过GPGPU(general purpose GPU)来实现的。
以下是2D Fluid初步实验的截图：
http://pic002.cnblogs.com/images/2012/411346/2012061208520030.jpg
http://pic002.cnblogs.com/images/2012/411346/2012061208521498.jpg
要理解实现原理，首先要熟悉其基于的物理模型：“stable fluids” by Stam 1999. 从实现角度来说，根据fluid effect的计算公式
http://pic002.cnblogs.com/images/2012/411346/2012061209250126.png
主要考虑如下几个要素：Advection [气]水平对流， pressure， diffusion， (Vorticity [涡旋] Confinement 主要用于烟雾，火焰), external forces. 每一个要素的作用大小是通过读取其对应的图片来获取的。
具体实现步骤如下：
1.将屏幕分为一定大小数量的网格，如图所示：
http://pic002.cnblogs.com/images/2012/411346/2012061208551697.png
由于我的窗口大小设定为800*600，横行分为了80*2格，纵向分为了60*2格.之后的相关计算都是以格子为单位。蓝色为边界部分，不做为渲染区域。
2. 根据网格生成顶点。
VS_INPUT_FLUIDSIM_STRUCT tempVertex1; VS_INPUT_FLUIDSIM_STRUCT tempVertex2; VS_INPUT_FLUIDSIM_STRUCT tempVertex3; VS_INPUT_FLUIDSIM_STRUCT tempVertex4; int w = m_dim[0]; int h = m_dim[1]; float left = -1.0f + 2.0f/w;//exclude the boundary cell, each cell size is 2.0f/w float right=1.0f - 2.0f/w; float top =1.0f - 2.0f/h; float bottom = -1.0f + 2.0f/h; tempVertex1.Pos = D3DXVECTOR3( left, top, 0.0f);//projection screen pos tempVertex1.Tex = D3DXVECTOR3( 1.0f, 1.0f, 0.0f);//texture pos, exclude boundary cell tempVertex2.Pos = D3DXVECTOR3( right, top, 0.0f); tempVertex2.Tex = D3DXVECTOR3( (w-1.0f), 1.0f, 0.0f); tempVertex3.Pos = D3DXVECTOR3( right, bottom, 0.0f); tempVertex3.Tex = D3DXVECTOR3( (w-1.0f), (h-1.0f), 0.0f); tempVertex4.Pos = D3DXVECTOR3( left, bottom, 0.0f); tempVertex4.Tex = D3DXVECTOR3( 1.0f, (h-1.0f), 0.0f); (*vertices) = tempVertex1; (*vertices) = tempVertex2; (*vertices) = tempVertex3; (*vertices) = tempVertex1; (*vertices) = tempVertex3; (*vertices) = tempVertex4;
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