» cn.Tutorial Effects - Mr. Wiggle
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cn.Tutorial Effects - Mr. Wiggle

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TOC: Of Effects and Shaders
Back: Vertexshader Preparations
Next: Function Printing


让我们与著名的“抖动先生”的例子开始,通过正弦波扭曲网格:

网格上的每个顶点调用顶点着色器。正如你学过的那样here,顶点着色器的输入是储存在网格中的顶点,这些现在要用于处理:

vs2ps VS(
    float4 PosO  : POSITION,
    float4 TexCd : TEXCOORD0)
{
...
}

这里我们的兴趣点转移到 PosO向量,它是当前顶点的位置。我们要根据它的垂直位置(y坐标)来决定x坐标的偏移:

PosO.x += sin(PosO.y);

为了控制抖动的波浪,我们添加了一些参数:

PosO.x += sin(PosO.y * Frequency + Phase) * Amplitude;

那么顶点着色器和它的输入参数像这样:

float Frequency = 10;
float Phase = 0;
float Amplitude = 0.01;
 
vs2ps VS(
    float4 PosO  : POSITION,
    float4 TexCd : TEXCOORD0)
{
    //declare output struct
    vs2ps Out;
 
    //offset x coordinate
    PosO.x += sin(PosO.y * Frequency + Phase) * Amplitude;
 
    //transform position
    Out.Pos = mul(PosO, tWVP);
 
    //transform texturecoordinates
    Out.TexCd = mul(TexCd, tTex);
 
    return Out;
}

相应的程序片如下:

mr wiggle patch

Next: Function Printing
Back: Vertexshader Preparations
TOC: Of Effects and Shaders

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Shoutbox

~3d ago

dawoof: Did u use the NVAPI to do the warping and other functions?

~3d ago

manuel: @dawoof I did. Just some tests. with the sync card you get no tearing thats great.

~4d ago

dawoof: has anyone used nvidia MOSAIC and VVVV? (without vioso or automated callibration)

~4d ago

joreg: mystery surprise guest at #vvvv meetup number 9 in #berlin coming tuesday: 9-berlin-vvvv-meetup

~6d ago

mediadog: @dawoof I use Screen Capture Recorder to put my desktop in VR, it provides a virtual webcam: https://sourceforge.net/projects/screencapturer/files

~6d ago

TremensS: Just one step further, reinstalling VC++2012 did the trick! This might help anyone having the same surprise...

~6d ago

TremensS: Hey! Since Win10 update last night, all my Assimp nodes are red in both beta36/38. Tried reinstalling VC++2013/2017. Any hints?