Embree intersectors and hit IDs

[Hamza_C_]

Hello,

I'm starting to develop a ray tracing application using Embree.

What I managed to do :

• Create an accelerator structure.
• Create an intersector from this structure.
• Intersect some rays with triangles.

My problem is that no matter what direction of propagation the ray has, I always get the same id0 and id1 parameters (0 and 0) in the generated Hit object. I guess this is because all the triangles are considered to be in the same primitive.

However, I need to be able to identify which triangle my ray did intersect. So my question is : is there a way in Embree to identify it or should I do it by myself ?

Thanks,
Hamza

[Hamza_C_]

Problem solved : I hadn't understood the meaning of id0 and id1.
One should actually set their value to what needed (an index corresponding to the triangle ID, for example) while building the BuildTriangle * object and this value would be available in the Hit object generated.