Cloo, C# to OpenCL struct transfer trouble

typedef struct
{
	float3 a, b, c;
	float3 ambient, diffuse, specular;
} Triangle;
...
__kernel void Main(__write_only image2d_t image, __global Triangle * triangles, const float trianglesCount)
{
	Triangle tri = triangles[0];
	...

public struct RGB
{
	public float R, G, B;
 
	public RGB(float n) : this(n, n, n) { }
 
	public RGB(float R, float G, float B)
	{
		this.R = R;
		this.G = G;
		this.B = B;
	}
}
 
public struct Triangle
{
	public Vector3 a, b, c;
	public RGB ambient, diffuse, specular;
 
	public Triangle(Vector3 a, Vector3 b, Vector3 c) : this(a, b, c, new RGB(), new RGB(), new RGB()) { }
 
	public Triangle(Vector3 a, Vector3 b, Vector3 c, RGB ambient, RGB diffuse, RGB specular)
	{
		this.a = a;
		this.b = b;
		this.c = c;
		this.ambient = ambient;
		this.diffuse = diffuse;
		this.specular = specular;
	}
}

triangles = new ComputeBuffer<CL.Triangle>(CL.context, ComputeMemoryFlags.ReadOnly, new CL.Triangle[]
{
	new CL.Triangle(new Vector3(), new Vector3(0, 1, 0), new Vector3(0, 0, 1), new CL.RGB(1, 0, 0), new CL.RGB(), new CL.RGB())
});
...
kernel.SetMemoryArgument(1, triangles);