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//using float4, but really, it does this in 3f space. the last float is 1 (or 0).
float4 findPlaneNormal3f(float4 pt1, float4 pt2, float4 pt3)
{
        float4 vec1 = pt2 - pt1;
        float4 vec2 = pt3 - pt1;
        float4 normal = cross(vec1, vec2);
        return normalize(normal);
}


__kernel void test(
        const __global float4* pt0,
        const __global float4* pt1,
        const __global float4* pt2,
        __global float4* out
){
        int i = get_global_id(0);

        out[i] = findPlaneNormal3f(pt0[i], pt1[i], pt2[i]);
}