Wavefront OBJ file reader finished, but not tested.
If vector is too slow, it may need a pre pass to get the count and allocate the memory.
succeed to load OBJ scene file;
AmVec3f updated for operations;
Camera added;
OpenGL Draw tried but camera info is not properly set.
model utilization, including the triangle normals,
refraction density and transparency added to material,
functions added for AmVec3f,
AmLight added, OpenGL render finished.
basic ray tracing structure added.
finish main path of ray tracing
resize added;
draw functions finished and tested;
basic ambient and diffuse tested;
kd-tree initialized;
finish kdtree acceleration, but small bugs exist that makes some blake line near the edge of tree node box.
model added the way of re-pass other scenes to the model