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

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


Lets start with the famous MrWiggle effect, it distorts a mesh by sine waves:

The vertex shader is called for each vertex of the mesh. As you have learned here, the input of the vertex shader is the data stored in the vertex of the mesh which is now processed:

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

Here we are interested in the PosO vector, which is the position of the current vertex. We will add an offset to the x coordinate of the vertex depending on its vertical position (y coordinate):

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

To control the waves we add some parameters:

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

Then the vertex shader with its inputs looks like:

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;
}

And the patch accordingly:

mr wiggle patch

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

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Shoutbox

~4d ago

ravazquez: indeed!

~4d ago

schlonzo: kickass shader @evvvvil

~5d ago

evvvvil: "Reclaim the streets" - Winning shader live coded live at revision 2021 shader showdown semi final. https://www.shadertoy.com/view/fdSGWw

~5d ago

karistouf: sorry 3080 10G vs 3090 24go ?

~5d ago

karistouf: RTX 3090 24go or 3090 10go ar really doing difference ith textures and VVVV beta ?

~6d ago

joreg: and beta42 previews now include VL 2021.3.2: downloads/previews

~6d ago

joreg: bugfix release vvvv gamma 2021.3.2 is out: https://thegraybook.vvvv.org/changelog/2021.3.html

~12d ago

joreg: @soundreactor looks really odd. could this be some strict antivirus or firewall settings?