public bool Occluded(V3f rayOrigin, V3f rayDirection, float minT = 0.0f, float maxT = float.MaxValue, RTCFilterFunction filter = null)
{
// NOTE: rtcInitIntersectContext is an inline method -> do manually
var ctx = new RTCIntersectContext()
{
instID = unchecked ((uint)-1),
filter = filter != null?Marshal.GetFunctionPointerForDelegate(filter) : IntPtr.Zero,
};
var rtRay = new RTCRay()
{
org = rayOrigin,
dir = rayDirection,
tnear = minT,
tfar = maxT,
flags = 0, // must be initialized with 0
time = 0,
mask = 0,
id = 0,
};
unsafe
{
var ctxPtr = &ctx;
var rayPtr = &rtRay;
EmbreeAPI.rtcOccluded1(Handle, ctxPtr, rayPtr);
}
// tfar set to -inf if intersection is found
return(rtRay.tfar == float.NegativeInfinity);
}
public bool Intersect(V3f rayOrigin, V3f rayDirection, ref RayHit hit, float minT = 0.0f, float maxT = float.MaxValue, RTCFilterFunction filter = null)
{
// NOTE: rtcInitIntersectContext is an inline method -> do manually
var ctx = new RTCIntersectContext()
{
instID = unchecked ((uint)-1), // need to be initialized with RTC_INVALID_GEOMETRY_ID
filter = filter != null?Marshal.GetFunctionPointerForDelegate(filter) : IntPtr.Zero,
};
var rayHit = new RTCRayHit()
{
ray = new RTCRay()
{
org = rayOrigin,
dir = rayDirection,
tnear = minT,
tfar = maxT,
flags = 0, // must be initialized with 0
time = 0,
mask = 0,
id = 0,
},
hit = new RTCHit()
{
geomID = unchecked ((uint)-1), // must be initialized to RTC_INVALID_GEOMETRY_ID
}
};
unsafe
{
var ctxPt = &ctx;
var rayHitPt = &rayHit;
EmbreeAPI.rtcIntersect1(Handle, ctxPt, rayHitPt);
}
if (rayHit.hit.geomID != unchecked ((uint)-1))
{
hit.T = rayHit.ray.tfar;
hit.Coord = rayHit.hit.uv;
hit.Normal = rayHit.hit.Ng;
hit.PrimitiveId = rayHit.hit.primID;
hit.GeometryId = rayHit.hit.geomID;
hit.InstanceId = rayHit.hit.instID;
return(true);
}
return(false);
}
