[Pbrt-discuss] help! plugin problem.

[Bill Conan]

hello guys,

i wrote a accelerator plugin for pbrt. the code was modified directly
from grid.cpp, however weird problem happened when i tried to run it.

this is the problematic part:

extern "C" DLLEXPORT Primitive *CreateAccelerator(const
vector<Reference<Primitive> > &prims,const ParamSet &ps)
{
	printf("%d",prims.size());
	if(!prims[0]) printf("kkkkk");
	return new GridTreeAccel(prims);
}

i tried to render areapot.pbrt
the prims.size() is 105, however prims[0] is NULL, i will get access violation.

why does this happen? i can't see any difference with grid.cpp.

thank you.