gistfile1.txt

#pragma kernel PlacePoint


  struct Vert{

  
    float3 pos;
    float3 vel;
    float3 nor;
    float3 tang;
    float2 uv;
    float used;
    float3 triIDs;
    float3 triWeights;
    float3 debug;

  };

    struct SkinnedVert{

    float3 pos;
    float3 vel;
    float3 nor;
    float3 tang;
    float2 uv;
  
    float used;
  
   
    float3 targetPos;
    float3 bindPos;
    float3 bindNor;
    float3 bindTan;

    float4 boneWeights;
    float4 boneIDs;

    float debug;

  };


#include "../Chunks/snoise.cginc"
#include "../Chunks/curlNoise.cginc"

int _Whirlwind;



RWStructuredBuffer<Vert> _VertBuffer;
RWStructuredBuffer<SkinnedVert> _SkinnedBuffer;

#define NR_THREADS 128
[numthreads(NR_THREADS,1,1)]
void PlacePoint(uint threadID : SV_GroupIndex, uint3 u3GroupID : SV_GroupID) {

  int pID = threadID + u3GroupID.x * NR_THREADS;

  Vert vert = _VertBuffer[pID];
  SkinnedVert v0 = _SkinnedBuffer[int(vert.triIDs.x)];
  SkinnedVert v1 = _SkinnedBuffer[int(vert.triIDs.y)];
  SkinnedVert v2 = _SkinnedBuffer[int(vert.triIDs.z)];



  float3 fPos  = v0.pos * vert.triWeights.x;
         fPos += v1.pos * vert.triWeights.y;
         fPos += v2.pos * vert.triWeights.z;

  float3 fNor  = v0.nor * vert.triWeights.x;
         fNor += v1.nor * vert.triWeights.y;
         fNor += v2.nor * vert.triWeights.z;

  float3 fTan  = v0.tang * vert.triWeights.x;
         fTan += v1.tang * vert.triWeights.y;
         fTan += v2.tang * vert.triWeights.z;

  float2 fUV  = v0.uv * vert.triWeights.x;
         fUV += v1.uv * vert.triWeights.y;
         fUV += v2.uv * vert.triWeights.z;

  vert.nor = normalize(fNor);
  vert.tang = fTan;
  vert.uv = fUV;

  vert.debug = 1;//float3( vert.boneWeights[0] , vert.boneWeights[1], vert.boneWeights[2] );
if( _Whirlwind == 0 ){
  vert.pos = fPos;

}else if( _Whirlwind == 1){
  

  float3 force = float3(0,0,0);

  float3 dif = vert.pos - fPos;

  force = -dif;

  float rand=  (sin( float(pID) * 1000 ) + 4)/4;

  vert.vel += force * .01  * rand;
  vert.pos += vert.vel;
 // 
  // /vert.pos += vert.vel;
  vert.vel *= .9;


  //vert.pos = fPos;



}else if( _Whirlwind == 2){

    float3 force = .01*float3(0,1,0);

  float3 dif = vert.pos;
  float y = dif.y;
  dif.y = 0;

  float3 cForce = cross( normalize(dif) , float3(0,1,0));

  force -= dif / y;
  force += cForce;
  float rand=  (sin( float(pID) * 1000 ) + 4)/4;

  vert.vel += force  * .01 * rand;
  vert.pos += vert.vel;
   vert.vel *= .9;


}else{
    float3 force = .01*float3(0,1,0);

  float3 dif = vert.pos;
  float y = dif.y;
  dif.y = 0;

  float3 cForce = curlNoise( vert.pos * .3 );//cross( normalize(dif) , float3(0,1,0));

  force += cForce;
  float rand=  (sin( float(pID) * 1000 ) + 4)/4;

  vert.vel += force  * .0004 * rand;
  vert.pos += vert.vel;
   vert.vel *= .95;


}
  _VertBuffer[pID] = vert;



}