I notice the vertexFormat of OptixBuildInputTriangleArray (when building GAS) can be set to OPTIX_VERTEX_FORMAT_FLOAT2. Whether this means the acceleration structure(AS) supports 2D triangles or the AS still keeps 3D triangles and leaves the third value of vertex as zero?
I cannot find any references on the documentation or Google, and it seems that there is no similar setting in OptiX 6.