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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

~4d ago

vasilis: @readme I already did this...but when I reopen my patch and make some changes I press save all..and then the same again. It opens 2

~5d ago

readme: vasilis, Alt+R in your vvvv instance, delete it from vvvv root, save. Otherwise vvvv loads up the patch by default.

~5d ago

vasilis: And even if I go in the root patch and delete them. when i save my patch again it duplicates.

~5d ago

vasilis: Anyone know why when I save my patch and close vvvv, when I try again to reopen it, it opens two patches (two the same)?

~5d ago

david: updated the berlin meetup log. Please correct names or missing stuff. berlin meetups 2018

~6d ago

david: join us today for our Berlin vvvv meetup 2-berlin-vvvv-meetup

~7d ago

eno: Updated open positions: http://nsynk.de/jobs

~7d ago

levi: new projector node https://www.lightform.com/