gistfile1.txt

#pragma kernel CSMain
 
#define threadX 6
#define threadY 6
#define threadZ 6

#define strideX 3
#define strideY 6
#define strideZ 6

#define gridX (threadX * strideX)
#define gridY (threadY * strideY)
#define gridZ (threadZ * strideZ)



int _RibbonWidth;
int _RibbonLength;

int _Offset;
float _Multiplier;


struct Vert{
	float3 pos;
	float3 oPos;
	float3 ogPos;
	float3 norm;
	float2 uv;
	float life;
	float ids[8];
	float3 debug;
};

struct Link{
	float id1;
	float id2;
	float distance;
	float stiffness;
};

RWStructuredBuffer<Vert> vertBuffer;
RWStructuredBuffer<Link> linkBuffer;

[numthreads(threadX,threadY,threadZ)]
void CSMain (uint3 id : SV_DispatchThreadID) {
  
  	int pID = id.x + id.y * gridX + id.z * gridX * gridY;
  	
 	Link link = linkBuffer[pID];

 	int id1 = int( link.id1 );
 	int id2 = int( link.id2 );

 	if( _Offset == 1 && id1 >= 0 && id2 >= 0 ){
 		
 		id1 += _RibbonWidth;
 		id2 += _RibbonWidth;

 		// we in a right buffer,
 		// both are above, so let em go to bottoms!
 		if( id1 >= _RibbonWidth * _RibbonLength && id2 >= _RibbonWidth * _RibbonLength ){
 			id1 -= _RibbonWidth * _RibbonLength;
 			id2 -= _RibbonWidth * _RibbonLength;
 		}

 		if( id1 >= _RibbonWidth * _RibbonLength ){ id1 = -1; }
 		if( id2 >= _RibbonWidth * _RibbonLength ){ id2 = -1; }
 	}

 	if( id1 > -1 && id2 > -1 ){

 		Vert v1 = vertBuffer[id1];
 		Vert v2 = vertBuffer[id2];

 		float3 dif = v1.pos - v2.pos;
 		float l = length( dif );

		float difference = ((link.distance ) - l ) / l;

		float3 translate = dif * .6 * difference * _Multiplier;// /  float( _WhichOne + 1);

		float3 t1 = 1 * translate; // vert.mass;
		float3 t2 = 1 * translate; // vert2.mass;
		
		float3 n1 = v1.pos + t1;
		float3 n2 = v2.pos - t2;

		v1.pos = n1;
		v2.pos = n2;

		vertBuffer[ id1 ] = v1;
		vertBuffer[ id2 ] = v2;



 	}

	
}