Hi change the code of the following file"XSIAmbientOcclusion.sl", with this one and it should fix your issue:

/*
    Copyright (c) 2007 TAARNA Studios International.
*/

#ifndef __XSIAmbientOcclusion_sl
#define __XSIAmbientOcclusion_sl

void XSIAmbientOcclusion(
    float i_samples;
    RGBA_COLOR( i_bright );
    RGBA_COLOR( i_dark );
    float i_spread;
    float i_max_distance;
    float i_reflective;
    float i_output_mode;
    float i_occlusion_in_alpha;
    float i_ao_interaction; /* Not Used */

    output color o_result;
    output float o_result_a; )
{
    extern point P;
    extern normal N;

    normal Nf = ShadingNormal( normalize(N) );   

    float maxdist = i_max_distance == 0 ? 1e38 : i_max_distance;

    uniform float algorithm = 1; /* default is raytracing */
    uniform float maxsolidangle = 0.1;
    option( "user:xsi_cb_algorithm", algorithm );
    option( "user:xsi_ao_maxsolidangle", maxsolidangle );

    float occ;

    if( algorithm == 2 )
    {
        /* Point-based */
        uniform string bake_file = "";
        option( "user:bake_file", bake_file );

        occ = occlusion(
            P, Nf, i_samples,
            "pointbased", 1,
            "clamp", 1,
            "filename", bake_file,
            "coordsystem", "world",
            "coneangle", i_spread * PI * 0.5,
            "maxsolidangle", maxsolidangle,
            "maxdist", maxdist );
    }
    else
    {
        /* ray-traced */
        uniform string hitmode = "primitive";
        attribute( "user:occlusion_hitmode", hitmode );

        uniform float falloff = 0;
        uniform float falloffmode = -1;
        attribute( "user:xsi_falloff_type", falloffmode );
        if( falloffmode != -1 )
            attribute( "user:xsi_falloff_exponent", falloff );

        /* Take maxdist from attribute if not 0 */
        uniform float attr_maxdist = 0;
        attribute( "user:xsi_maxdist", attr_maxdist );
        if( attr_maxdist != 0 )
            maxdist = attr_maxdist;

        occ = occlusion(
            P, Nf, i_samples,
            "coneangle", i_spread * PI * 0.5,
            "distribution", "uniform",
            "maxdist", maxdist, "hitmode", hitmode,
            "falloffmode", falloffmode, "falloff", falloff );
    }

    RGBA_MIX(o_result, i_bright, i_dark, occ);
}
#endif

And here's addition for WORKING reflective AO



#ifndef __XSIAmbientOcclusion_sl
#define __XSIAmbientOcclusion_sl

void XSIAmbientOcclusion(
    float i_samples;
    RGBA_COLOR( i_bright );
    RGBA_COLOR( i_dark );
    float i_spread;
    float i_max_distance;
    float i_reflective;
    float i_output_mode;
    float i_occlusion_in_alpha;
    float i_ao_interaction; /* Not Used */

    output color o_result;
    output float o_result_a; )
{
    extern point P;
    extern normal N;

    normal Nf = ShadingNormal( normalize(N) );   

    float maxdist = i_max_distance == 0 ? 1e38 : i_max_distance;

    uniform float algorithm = 1; /* default is raytracing */
    uniform float maxsolidangle = 0.1;
    option( "user:xsi_cb_algorithm", algorithm );
    option( "user:xsi_ao_maxsolidangle", maxsolidangle );

    float occ;

    if( algorithm == 2 && i_reflective == 0 )
    {
        /* Point-based */
        uniform string bake_file = "";
        option( "user:bake_file", bake_file );

        occ = occlusion(
            P, Nf, i_samples,
            "pointbased", 1,
            "clamp", 1,
            "filename", bake_file,
            "coordsystem", "world",
            "coneangle", i_spread * PI * 0.5,
            "maxsolidangle", maxsolidangle,
            "maxdist", maxdist );
    }

else if( algorithm == 2 && i_reflective == 1)
       {
    /* Point-based reflective AO */

       uniform string bake_file = "";
       option( "user:bake_file", bake_file );

       string distribution = "cosine";
       normal Nn = normalize(N);
        vector refl = reflect(I, Nn);
       
        occ = occlusion(P, refl, i_samples, "pointbased", 1,"filename", bake_file,
                        "distribution", distribution,
                          "clamp", 1,
                        "maxdist", maxdist,
                    "coneangle", i_spread * PI * .5,
                        "maxsolidangle", maxsolidangle);
       Ci = 1 - occ;
        Ci *= Os;
        Oi = Os;
    }
    else
    {
        /* ray-traced */
        uniform string hitmode = "primitive";
        attribute( "user:occlusion_hitmode", hitmode );

        uniform float falloff = 0;
        uniform float falloffmode = -1;
        attribute( "user:xsi_falloff_type", falloffmode );
        if( falloffmode != -1 )
            attribute( "user:xsi_falloff_exponent", falloff );

        /* Take maxdist from attribute if not 0 */
        uniform float attr_maxdist = 0;
        attribute( "user:xsi_maxdist", attr_maxdist );
        if( attr_maxdist != 0 )
            maxdist = attr_maxdist;

        occ = occlusion(
            P, Nf, i_samples,
            "coneangle", i_spread * PI * 0.5,
            "distribution", "uniform",
            "maxdist", maxdist, "hitmode", hitmode,
            "falloffmode", falloffmode, "falloff", falloff );
    }

    RGBA_MIX(o_result, i_bright, i_dark, occ);
}
#endif

Hi, are you using PTC or RT for the OCC?

gonul wrote:

Hi gducatel. I' am using PTC. There is a problem, but without using GI.


3Delight without GI

http://img259.imageshack.us/img259/9833 … randao.png

To apply motion blur to raytraced AO you can set Shading Frequency option to "Once per segment" and increase Deformation steps.

gonul, it works, but only for point based AO

gonul, i mean "my humble fix for reflective AO works only for point based method" period

gonul,
please don't take me wrong, but, I think you won't go so far with these comparisons. 3delight is quite different render engine than MR or V-Ray. About point-based method, there are nice explanations in rendering guidelines in docs of standalone 3Delight ("extra" folder of 3Delight for SI addon).