void ApplyFreeSlip(RenderTexture[] field)
{
float u = 1.0f / (float)TEX_SIZE;
Vector2 offset;
Graphics.Blit(field[READ], field[WRITE]);
offset = new Vector2(u, 0.0f);
m_applyFreeSlipMat.SetVector("_Offset", offset);
RTUtility.Blit(field[READ], field[WRITE], m_applyFreeSlipMat, m_rectLeft, 0, false);
offset = new Vector2(0.0f, u);
m_applyFreeSlipMat.SetVector("_Offset", offset);
RTUtility.Blit(field[READ], field[WRITE], m_applyFreeSlipMat, m_rectBottom, 0, false);
offset = new Vector2(-u, 0.0f);
m_applyFreeSlipMat.SetVector("_Offset", offset);
RTUtility.Blit(field[READ], field[WRITE], m_applyFreeSlipMat, m_rectRight, 0, false);
offset = new Vector2(0.0f, -u);
m_applyFreeSlipMat.SetVector("_Offset", offset);
RTUtility.Blit(field[READ], field[WRITE], m_applyFreeSlipMat, m_rectTop, 0, false);
RTUtility.Swap(field);
}