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Channel: Embree: Photo-Realistic Ray Tracing Kernels
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Point projection onto geometry

I noticed in your SIGGRAPH 2018 slides, in the "outlook" section there was mention of 'point projection onto geometry". This would be a very helpful feature, do you have any estimate as to when it...

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Clarification on RTC_GEOMETRY_TYPE_FLAT_LINEAR_CURVE "u" value.

The documentation says "The intersection with the curve segment stores the parametric hit locationalong the curve segment as u-coordinate (range 0 to +1)." As linear curves are represented as...

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enable EMBREE_BACKFACE_CULLING without using CMake

Hi,    I was wondering if it is possible to enable backface culling without using CMake. I already have my VS2013 project working with a bunch of other libraries. I need to add this option to the...

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rtcInterpolate0 with quad surfaces

Hi, I am trying to get the color of a point inside a quad using rtcInterpolate0. I took the code from the "interpolation" example:                 rtcSetGeometryVertexAttributeCount(quadGeom, 1);...

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rtcInterpolate with subdivision surface in dynamic scene

I'm building a dynamic scene containing subdivision geometry with continuously updating vertex buffers. I'm making rtcIntersect calls in that scene and the intersections points are updating correctly....

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intersection test with increased tolerance

I am trying to test collision detection by using embree. For this configuration I need more flexible intersection test (meaning larger epsilon) for triangle meshes.     For example, if I consider a...

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rtcIntersectNM & RTCRayHitN

Hi community, i'm trying to intersect geometry with the rtcIntersectNM method.  signature: void rtcIntersectNM( RTCScene scene, struct RTCIntersectContext* context, struct RTCRayHitN* rayhit, unsigned...

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TBB version used in Windows binary distribution

Greetings, Which version of Intel TBB is the latest version of Embree 2 (v2.17.5) built against in the Windows binary provided by Intel?  We are using TBB for other parts of a program and need to find...

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how to make sure PrimID is ok ?

Hi, Using Embree 3.6.1 (github tab) is very nice and I get nice intersection, but as soon as I want to use PrimID, It seems I hit a wall. There's not much documentation  I'm using it with a triangle...

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Specifying BVH branching factor

Hi,I'm running Embree's pathtracer tutorial, and I'm trying to figure out how to specify the max branching factor when creating a scene's BVH. Ideally I want only 4-way BVH's. What is the best way to...

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Intersection failed with RTC_GEOMETRY_TYPE_DISC_POINT

Hi,I made some tests with geometry of type RTC_GEOMETRY_TYPE_DISC_POINT and i found a weird behavior when a ray start to close to a primitive.For exemple, if 2 points are close ( inferior to the point...

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Vertices order for normal computation

Hello!I want to ask: which vertex order in triangle embree uses for normal computation?As far as i can see embree uses clock-wise order. So triangle with vertices ((0, 0, 0), (1, 0, 0), (0, 1, 0)) has...

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embree thread safety

I noticed in the release notes for embree v3.7.0 this feature:rtcCommitScene can now get called during rendering from multiple threads to lazily build geometry... combined with next bullet:Geometries...

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Performance issues on older hardware

I have an application that performs a large number of rtcPointQueryV() over moderately-sized triangle meshes.  I am seeing significant differences in performance depending on the hardware it is being...

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Embree and BVH

Hi all, I'm sorry if this is a dumb question. Does Embree offer BVH building in parallel?Thanks in advance.

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