» 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

~11h ago

auralscapes: By the way, if anyone would like to use any of my tracks or even parts thereof you are welcome. No fee. jerome@auralscapes.com

~12h ago

auralscapes: Thx for the advice. Much appreciated.

~14h ago

tonfilm: @auralscapes you can contact the author @dottore and ask him for the conditions.

~18h ago

auralscapes: A question for the group. I came across an application called Partitura. Is this app commercially available?

~1d ago

auralscapes: Don't have a clue how this all works but it is going to be an interesting journey indeed.

~4d ago

tonfilm: @all #vl now also has pin groups! vl-input-and-output-pin-groups #vvvv #creativecoding #visualprogramming #dotnet

~5d ago

evvvvil: Hey, broski, check my shader "The gamma ray feast" it goes bang and is commented with bad to mediocre jokes. https://www.shadertoy.com/view/wssXWl

~7d ago

hrovac: someone at b-seite on saturday?

~8d ago

woei: public player-(dx11.texture) performance and stability upgrade sponsored by https://meso.design/