Help Try to modify the velocity

[a172862967]

Code:

void Start()
{
     m_solver.OnSimulationEnd += ColorFromVelocity_OnInterpolate;
}

private void ColorFromVelocity_OnInterpolate(ObiSolver solver, float simulatedTime, float substepTime)
{
     if (solver.backendType == ObiSolver.BackendType.Compute)
     {
         m_computeShader.SetFloat("DeltaTime", Time.deltaTime);
         m_computeShader.SetBuffer(0, "ObiVelocityBuffer", solver.velocities.computeBuffer);
         int threadGroups = ComputeMath.ThreadGroupCount(solver.allocParticleCount, 128);
         m_computeShader.Dispatch(0, Mathf.CeilToInt(threadGroups), 1, 1);
     }
}

Code:

RWStructuredBuffer<float4> ObiVelocityBuffer;
float DeltaTime;

[numthreads(128,1,1)]
void CSMain (uint3 id : SV_DispatchThreadID)
{
    ObiVelocityBuffer[id.x] = float4(0, DeltaTime*10, 0, 0);
}

I followed the instructions on this page and tried applying extra force, but nothing seems to have changed.
Did I do something wrong?