David Megginson writes:
>
>David Megginson writes:
>
> > > 2. I used callbacks to prevent empty object branches from being
> > > culled. Perhaps a placeholder with a dummy bounding
>sphere would be
> > > better, since we'd still get FOV culling, but this will need more
> > > work.
> >
> > I'll look more closely at this one.
>
>Yes, that was it. I made the changes, and now here are my results for
>sitting still at the default location in daylight:
>
> With dynamic objects: 41fps
> Without dynamic objects: 41-42fps
This is MUCH better :-)
FWIW - This should help the 'stutter' while loading a 'bit'
void
makeWorldUpRotationMatrix (sgMat4 ROT, double hdg_deg,
double lon_deg, double lat_deg)
{
SGfloat sin_lat = sin( lat_deg * SGD_DEGREES_TO_RADIANS );
SGfloat cos_lat = cos( lat_deg * SGD_DEGREES_TO_RADIANS );
SGfloat sin_lon = sin( lon_deg * SGD_DEGREES_TO_RADIANS );
SGfloat cos_lon = cos( lon_deg * SGD_DEGREES_TO_RADIANS );
SGfloat sin_hdg = sin( hdg_deg * SGD_DEGREES_TO_RADIANS ) ;
SGfloat cos_hdg = cos( hdg_deg * SGD_DEGREES_TO_RADIANS ) ;
ROT[0][0] = cos_hdg * sin_lat * cos_lon - sin_hdg * sin_lon;
ROT[0][1] = cos_hdg * sin_lat * sin_lon + sin_hdg * cos_lon;
ROT[0][2] = -cos_hdg * cos_lat;
ROT[0][3] = SG_ZERO;
ROT[1][0] = -sin_hdg * sin_lat * cos_lon - cos_hdg * sin_lon;
ROT[1][1] = -sin_hdg * sin_lat * sin_lon + cos_hdg * cos_lon;
ROT[1][2] = sin_hdg * cos_lat;
ROT[1][3] = SG_ZERO;
ROT[2][0] = cos_lat * cos_lon;
ROT[2][1] = cos_lat * sin_lon;
ROT[2][2] = sin_lat;
ROT[2][3] = SG_ZERO;
ROT[3][0] = SG_ZERO;
ROT[3][1] = SG_ZERO;
ROT[3][2] = SG_ZERO;
ROT[3][3] = SG_ONE ;
}
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