Dec
16
2011
16
2011
Metablob shader testing
An article by 
Metablob shader testing.
2D metablobs..hmm..could this be used for (2D) fluids somehow?
Instructions:
– New scene
– Add plane, Location: 0,0,0 Rotation: 0,0,0
– Add camera, Location: 0,10,0 Rotation: 90,0,0 (its looking down the plane)
– Add material using this shader to the plane, you should see some blobs (its using screenposition, so you might not see blobs in editor, depending on your view pos)
Download source:
blobshader.unityPackage
Shader source: (v1.0)
// ORIGINAL GLSL SHADER: 'Metablob' by Adrian Boeing (2011)
Shader "mShaders/mblob1"
{
Properties
{
}
SubShader
{
Tags {Queue = Geometry}
Pass
{
CGPROGRAM
#pragma target 3.0
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
struct v2f {
float4 pos : POSITION;
float4 color : COLOR0;
float4 fragPos : COLOR1;
};
v2f vert (appdata_base v)
{
v2f o;
o.pos = mul (UNITY_MATRIX_MVP, v.vertex);
o.fragPos = o.pos;
o.color = float4 (1.0, 1.0, 1.0, 1);
return o;
}
half4 frag (v2f i) : COLOR
{
float animtime = _Time*10.0;
//the centre point for each blob
float2 move1;
move1.x = cos(animtime)*0.4;
move1.y = sin(animtime*1.5)*0.4;
float2 move2;
move2.x = cos(animtime*2.0)*0.4;
move2.y = sin(animtime*3.0)*0.4;
//screen coordinates
float2 p = -1.0 + 2.0 * i.fragPos.xy / float2 (7,7);
//radius for each blob
float r1 =(dot(p-move1,p-move1))*8.0;
float r2 =(dot(p+move2,p+move2))*16.0;
//sum the meatballs // uh..typo maybe Oo?
float metaball =(1.0/r1+1.0/r2);
//alter the cut-off power
float col = pow(metaball,8.0);
//set the output color
return float4(col,col,col,1.0);
}
ENDCG
}
}
FallBack "VertexLit"
}
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How can I make it work?
All I see is a black sphere 🙁
Thanks!!
added some instructions, havent tested it on a sphere..but on a plane it seems to work.
Thanks for the info and for the blog.
I thought it was a material to use in several near spheres in order to achive the 2D metablob effect ^_^U
how i can remove screen position dependency?
replace line:
float4 fragPos : COLOR1;
with:
float4 uv : TEXCOORD0;
replace line:
o.fragPos = o.pos;
with:
o.uv = float4( v.texcoord.xy, 0, 0 );
replace line:
float2 p = -1.0 + 2.0 * i.fragPos.xy / float2 (7,7);
with:
float2 p = i.uv.xy-float2(0.5,0.5);
(you might have to adjust those 0.5 values, but for the same scene, it should display the blobs on middle of the plane then)
Hi, just a quick question – does this shader require Unity Pro? 🙁 Can’t get it to work so i guess it does, but want to be shure. Thanks
Doesn’t need pro, if you set the scene plane & camera to those locations, it should work..
Does it show just black or that pink/magenta color?
Only black plane (everything was done as written above, no idea what could be wrong). Could you maybe upload a project folder where it works for you?
// also tried the modifications written above (screen position dependency), everythings still the same
/* sorry, forgot to click Reply :-X */
^ Added example scene download.