run compute shader in unity

run compute shader.cs

    RenderTexture RunShader()
    {
        int kernelHandle = shader.FindKernel("CSMain");

        RenderTexture tex = new RenderTexture(256, 256, 24);
        tex.enableRandomWrite = true;
        tex.Create();

        shader.SetTexture(kernelHandle, "Result", tex);
        shader.Dispatch(kernelHandle, 32, 32, 1);

        return tex;
    }

    private void renderWithMesh(RenderTexture source, RenderTexture destination)
    {
        var tmp = RenderTexture.GetTemporary(source.width, source.height, 0, source.format);

        Graphics.SetRenderTarget(destination);
        GL.Clear(false, true, new Color(0, 0, 0, 1));
        debug.materialDebug.SetPass(0);

        GL.wireframe = true;
        GL.PushMatrix();
        GL.LoadOrtho();

        Graphics.DrawMeshNow(mesh_, Matrix4x4.identity);

        GL.PopMatrix();
        //Graphics.Blit(tmp, destination);
        RenderTexture.ReleaseTemporary(tmp);
    }